19th July 2025: Highway → Murero → Highway → Home {Dinosaur Eggs Loarre & Zaragoza, July 2025}

While Zaragoza (Saragossa) is not a super-busy city, the noise from the large avenue the hotel was in woke me up early enough to be amongst the first customers at Pannitelli Original Bakery. I had a toast, orange juice, and a coffee, then set off to the not-so-easy task of retrieving my car, driving back to the hotel, getting my deposit returned, and going on my merry way. It took a while, but once that was taken care of I could drive off. Getting out of Zaragoza was easier than getting in had been, and there were few cars on the road. One of them was the traffic police, so every driver seemed on their best behaviour…

Once in the speedway, the first stop of the day was a petrol station, as there was no way I made it home with one quarter of a tank. Unfortunately, there were no low-cost fuelling points on my way, so I had to use a big-name one. Thirty euro don’t take you as far with branded fuel…

To be fair, I could have driven home the previous day, but I thought that after such a week, an extra night of sleep could only be beneficial. Staying also allowed me to see the Asian treasure exhibits in the Lonja and make a stop on the way. My first idea had been going downtown to see the Natural History Museum, but it closes at the weekend. That was why I asked about the visit during the course, and it turned out it was doable. Thus, in the end, I decided to make a stop in a small palaeontological site that I would not travel to otherwise. Furthermore, the site popped up during the course twice – the signage had been handled by Paleoymas and the Natural Science Museum had quite a few specimens from there.

View of a valley with a sign that reads 'Plaeontological site' in Spanish

The Yacimiento Paleontológico de Murero palaeontological site holds remains from the Cambrian Period, extremely important because there are around eight million years’ worth of fossils (511 to 503 million years ago) preserved in the strata. Palaeontologists have found about eighty species of trilobites, along with echinoderms which had not yet developed five-way symmetry, brachiopods, worms… It is mainly composed of shales which allow for soft-bodied organisms to be fossilised along the hard bits like shells or exoskeletons. The site is famous because it allowed researchers to identify sexual dimorphism in trilobites – they were able to describe two distinct types of animals within a same species, which are interpreted as male and female. What they don’t know is which animal is which sex.

I left Zaragoza using the A23, then turned to a national, smaller road (N234) that crossed over to the A2. The site and the municipality it technically belongs to, Murero, lie halfway through this road. As mentioned before, not somewhere I would purposely travel to, but since I was literally in the area, it was a convenient stop. The regional road was all right, but the local one was narrow and the curves were very sharp and steep. I was thankful that all of the cars I saw passed while I was hiking or taking photos of the site, and none while I was driving. I decided to only stop at the area which had a small parking lot so it was safe for me and any potential driver.

To be honest, I expected to see more in the palaeontological site. The signage has either weathered out or been vandalised and nothing is readable. It is a short walk up and down a hill where you can’t really see anything except for a box at the top where people leave what they find, but there was not a chance to see anything in situ. I guess the palaeontologists and the amateurs have taken out everything that is worth anything already – or left it well buried so it can’t be pillaged. I wouldn’t even consider it a nice hike because broken pieces of slates made the path extremely slippery (I forgot my hiking boots in the car…).

Walking upward to the site, among the pines. On the lft there is a rock with the number 6 painted on it with yellow paint.

Side of the mountain with pine trees

And oh, the temptation to steal a trilobite from the display box was strong! I resisted it though, and headed back to the car after an hour or so. I undid the path towards the N234 road and continued onto the A2. I made a stop in-between for some caffeine and a snack, but I was home for Spanish lunchtime. I have to admit I had pondered stopping somewhere along the way, maybe Daroca, Belchite or Calatayud, but considering that I still had to drive back, I decided to leave it for another time.

Cool crystal dendrite, which is not a fossil but still neat

Fossil equinoderms on a stone

Fossil trilobite, deformed by pressure and the pass of time

On my first solo road trip, I was surprised by the sheer amount of people who like driving at the same speed all the time. A bunch of drivers in the regional road, with limits of 90 kph, did 70 kph even when they drove through 50 kph towns. The same happened in the speedway – some people drove at 110 kph, both at the 120 kph or the 100 kph stretches. There were also those who liked aligning their cars with the markings that separate the lanes, effectively occupying both. The lorries were more manageable on the way back than towards Loarre, as it was a Saturday morning, and because the speedway feels more “downwards”.

Once home, it hit me how tired I was, so I guess it was a good thing that I had not made another stop. Checking Murero out was a good idea as it broke the trip in half and was a small hike that helped me keep alert, but more would have been overdoing it.

As a recap of my experience with the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs, I can say that all in all, it was amazing. The professors were extremely knowledgeable, they made learning effortless and entertaining, and the group was fun and easy-going. The course was way more hands-on than I had expected, literally covering everything from geological analysis to the fate of a dug-up piece, either in display or in storage within the museum, including working with the fossils themselves. It was not cheap, mostly due accommodation choices, but booking in advance probably made it better – and honestly, decent hotels were a must. As Loarre is a small village, food options were limited. Though there was a bakery / shop, we were out doing stuff while it was open. However, I made do with crisps or nuts for dinner, as I had a good breakfast. Probably lunch in Ayerbe was the weakest, and most awkward since it involved getting to know each other (and ten bucks for a frozen pizza was daytime robbery).

The whole trip involved driving around almost 700 km. It did show me that I (and my coffee-maker of a car) can manage the long drives better than I had expected, even during a “peak” time such as a holiday-period opening date. I am more comfortable on the road than in towns, though, even when caught in a jam. Was it the smartest idea to head to Loarre directly after work? Probably not, but if I had to do it all over again, I probably would – it was the only actually available option. And knowing that not all the course openings were filled, I would not have stressed as much over the University’s lack of efficient sign-up.

The only downside I can find is the lack of mental reset – I was constantly learning new facts, and I did not get much me-time. It was extremely fun, but not really a holiday where I could plan and do stuff at my own pace. Would I do it again? Well, the University of Teruel runs a similar summer course using Dinópolis resources, and sign ups open in February…

Stay tuned.

18th July 2025: In the University of Saragossa {Dinosaur Eggs Loarre & Zaragoza, July 2025}

I woke up and for the first time in days I put on “person clothes” (for the city) instead of “scarecrow clothes” (for hiking & working in the field). Before setting off on the trip, I went to the sales to buy some jeans that would work for sitting on rock or walking through thistles and dry grass, and while they are not particularly nice, they are comfortable and resistant. Saragossa / Zaragoza was still waking up as I headed for breakfast to a bakery close to the hotel, Pannitelli Original Bakery, which I had chosen for two reasons. One, they opened at 7:30, which gave me plenty of time to walk to the university afterwards and two, they had waffles, I had seen them online. I wanted waffles, and a big coffee. I had both (and some orange juice, just because I could).

It turned out that not driving to the university Universidad de Zaragoza had been a great idea. Though it had been my first thought (dump the car there, then walk to my accommodation), I was lucky that in the end I was able to reserve my parking spot with the hotel. It happens that access to campus is restricted to working staff. Students can drive into the parking lot ten times in the school year. And on top of that, there was a farmers’ market for some reason.

Having 20 minutes to walk, I was the first one there, and I sat down in the rock garden of the Earth Sciences building to wait for everyone else for the last day of the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs. By 9:00, when class was to start, I was the only one besides the teachers who had managed to arrive. Everyone else had either got lost, left Loarre late, or was taking forever trying to park. So yay me being lucky for once (and for the 20 € which the hotel parking cost for the whole stay).

The first chunk of the morning was a tour through the Rock and Hard Material Preparations, 3D Printing and Scanning Service (Servicio de preparación de rocas y materiales duros, impresión y escaneado en 3D) in the university. They have two main lines of work. One is to make thin translucent sections out of specimens so they can be studied under the microscope, and the other is digitalising and making 3D models and copies of items so they can be lent or studied through a computer. The inner works of the department were explained by Raquel Moya Costa, who not only described in detail all her complex machinery, she also gave each of us a 3D printed T-Rex charm from the Dino Run Game!

We then moved onto the Petrology lab to look at thin sections on the transmitted-light microscopes – preparations of a sauropod eggshell, a crocodilian eggshell and an iguanodon eggshell. There were other preparations we could snoop around if we promised not to take pictures and publish them. We also got to play with the 3D copy of one of the first eggs recovered from Loarre. Much less heavy than the real thing, for sure.

Microscope used in geological studies

Microscope preparations and how they look under the microscope. There are three egg specimens: one from Loarre (sauropod), a crocodile and an iguanodon, The crocodile is the thinnest, and the sauropod is the brightest and more complex

Then a bit of chaos ensued as we got distracted by the shiny exhibits of the Palaeontology department, and a couple of post-docs offered to show us their lab and what they were working on. Having finished all the activities of the course, the coordinators had organised an extra visit to the Natural Science Museum Museo de Ciencias Naturales de la Universidad de Zaragoza (which might have actually been my fault as I asked how come that would not happen, considering that most of the region’s fossils are officially deposited there). A few people left first, but some of us got delayed looking at the lab specimens, and then we had to hurry to the museum…

Zaragoza Natural Science Museum: Exhibits in the Geological science building. Replicas of dinosaurs and invertebrate fossils

Once we were at the site of the Museo de Ciencias Naturales, we were taken on an express visit of the palaeontology ward by Ester Díaz Berenguer, curator of the collections. The museum is located in one of the historical buildings of the Zaragoza campus. Designed by Ricardo Magdalena in 1886, it was erected with academicist criteria, in brick, with large windows and striking symmetry. It opened in 1893, and during the 20th century, it served as Faculty of Medicine. When the university moved to the newer campus, the building was refurbished as cultural spot and seat of the government body. The basement was turned into the exhibition site of the Science Museum, which has three main areas – palaeontology, natural science, and mineralogy.

The palaeontology ward of the museum comprises nine rooms. The first one is an introduction to the science and the concept of fossilisation, and the following ones run through the Earth’s history, from the Precambrian to the Quaternary. The Precambrian is the earliest “calculated” period in geological time, and spanned from 4567 to 539 million years ago (give or take). Though we cannot pinpoint when life actually originated, it was already there when this “supereon” gave way to the Cambrian. During the Ediacara Period, at the end of the last Eon of the Precambrian, the Proterozoic, the earliest complex multicellular organisms that we know about thrived in a state that has been called “The Garden of Ediacara”. The word “garden” tries to evoke the idea of the “Garden of Eden” as there was no active predation and life just… existed.

The next rooms focus on the “Cambrian Explosion”, a term used to refer to the point in geological time when living things took over the planet. At first, this brand-new life was comprised of ocean-dwelling invertebrates. In the room there are impressive trilobites from the Murero Palaeontological Site, which I had actually planned to drive through on my way back. But not only animals appeared, so did plants – organisms which produced a new toxic gas that would change the planet forever: oxygen. To the side of this area there is a curtained room, the “aquarium”.

Zaragoza Natural Science Museum: Two trilobites from the same species showing slightly different shapes, thought to be a male and a female

Here you can see the cranium of Carolowilhelmina geognostica, a fish which lived around 392 million years ago, during the Devonian period. It was a placoderm, a group whose main characteristics were being covered in armoured plates, and having developed an actual jaw and true teeth. The specimen is not just the holotype, it is the only known fossil of the animal. The cranium alone measures almost 45 cm, and by its shape, palaeontologist speculate that the animal was probably a predator of invertebrates. A first fragment of the fossil was found in Southern Aragón in 1971 by palaeontologist Peter Carls. Carls kept returning to the site to search for the rest of it every summer, until in 1986 he unearthed the rest of the skull, which was finally extracted in 1993.

Zaragoza Natural Science Museum: skull of an ancient armoured fish

The following room is devoted to the Mesozoic, and it hosts another of the museum treasures, the skull of the holotype and only specimen of Maledictosuchus riclaensis, the “Cursed Crocodile from Ricla”. This crocodilian lived in saltwater around 163 million years ago, during the Middle Jurassic. It had flippers instead of legs, and probably ate fish. The fossil was found during the construction of the high-speed railway between Madrid and Barcelona in 1994. It earned the name of “cursed crocodile” because despite the fact that it was the oldest crocodilian found in Spain, exceptionally preserved on top of that, it took 20 years until someone could tackle its study and description. The “curse-breaking” researcher was Jara Parrilla Bel, one of the post-docs who shown us her lab work at the university.

Zaragoza Natural Science Museum: Skull of an ancient crocodile

Of course, the “stars” of any palaeontological exhibit are dinosaurs. The museum hosts several iconic pieces, amongst them replica of the feet of the first dinosaur ever described by researchers belonging to the local university Universidad de Zaragoza, Tastavinsaurus sanzi (a titanosaur), a whole specimen of the Mongolian Psittacosaurus (a small ceratopsian), and a good part of an Arenysaurus ardevoli, a hadrosaur which lived in the Pyrenees area around 66 million years ago, during the early Maastrichtian; the rest of the specimen is located in Arén, where it was located, and which is one of the museum’s satellite centres, just like Loarre’s museum-lab. In the same room there were trunks of fossilised wood that could be touched, and a skull of the extinct crocodile Allodaposuchus subjuniperus.

Zaragoza Natural Science Museum: Skeleton of a small Mongolian dinosaur

Zaragoza Natural Science Museum: some bones from a hadrosaur, including the tale, hind hip and some ribs

After a small room with an audiovisual representing the impact of the meteorite and the K-Pg mass extinction (which we skipped due to time constraints), there was an exhibit of the spread of mammals. The specimen of honour in this exhibit is the ancient sirenian Sobrarbesiren cardieli (holotype, and the topic of our guide’s thesis). This species lived during the Eocene, around 45 million years ago. Sirenians (manatees and dugongs) are a type of marine mammals whose closest relatives are elephants – and not other ocean-dwelling mammals. After life spread through land, a number of mammals went back to water, and it looks like this species is a snapshot on the readaptation process: it was already completely aquatic, but it still had four functional limbs. Its hind legs had started reducing and its tail was getting flat. It was a strict herbivore, eating sea grass, but less efficiently than current sirenians.

Zaragoza Natural Science Museum: Skull of an ancient sirenian.

There was also an impressive aquatic turtle of the genus Chelonia, several remains of Gomphotherium angustidens, an elephantimorph, and smaller pieces including crabs, sea urchins, gastropods and even insects. Several of these specimens are holotypes, too.

The final area was almost contemporary considering when we had started. It hosted remains of cave bears (Ursus spelaeus, 40,000 years ago), the skull of an aurochs (Bos primigenius, a species that actually lived until the 1600s), evidence ancient hyena nests, micro-invertebrate bones, mammoth defences… These animals coexisted with human beings, whose skulls comprise the ending room before moving onto the “nature collections” which we did not visit because a) the course had after all to do with palaeontology and b) it was closing time – quite literally, museum security was turning off lights behind us since the museum shut down at 14:00.

Zaragoza Natural Science Museum: Skull of an ancient bull, curved mammoth defence, a pile of bones from a hyena nest and several human-ancestor skulls

We had a mini closure “ceremony” in the hall of the building – coordinators Miguel Moreno Azanza and Lope Ezquerro Ruiz thanked us for attending, we clapped and thanked them back. Then we all went off to have a drink, a snack and a chat. A bit after 16:00, when most students had already left and the professors had been joined by university staff, I took my leave.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

Hopping from shadow to shadow to avoid the sun and the heat as much as I could, I headed downtown. On my way I made an exception regarding the walking in the shade when I found the only remaining gate of the original Medieval Wall, today called Puerta del Carmen. Calling it “original” is a bit of a stretch though. While it is in the same place as the first gate, it actually dates from the early 1790s, and it follows Neoclassical patterns.

I also stopped at Starbucks for a Vanilla Frappuccino – I’m on a bit of a matcha remorse trip due to the alleged shortage, so I’ve reverted to my old drink of choice. With a temperature of around 38 ºC, I reached the most important square in town, Plaza de Nuestra Señora del Pilar, where the namesake basilica is. I kid you not, what was running through my head was “I’ve got a 0.5 zoom on my phone now, I’ll be able to take a nice picture of the whole building with its towers…”. Only to find said towers covered in scaffolding. I was able to take the picture, but it could have been nicer. I entered the Cathedral-Basilica of Our Lady of the Pillar Catedral-Basílica de Nuestra Señora del Pilar, a Baroque / Neomudejar catholic temple which is considered the first-ever church dedicated to the Virgin Mary. I sat at the chapel for a little bit, but when I was ready to have a walk around the church, there was a call for mass, so I did not do it out of respect.

Chapel of Our Lady of the Pillar, a baroque chapel for the workshop of a small figurine of the Virgin Mary carrying a child and standing on a pillar

Instead, I strolled to the former exchange building Lonja de Zaragoza, which has been turned into a free exhibition centre. The building is Renaissance with a touch of Neomudejar, and it is considered the most important civil architecture construction erected in the whole area of Aragón during the 16th century.

I had read that there was an exhibition on Asian culture called Tesoros. Colecciones de arte asiático del Museo de Zaragoza – Treasures: Asian art collections from the Zaragoza Museum. At the moment, the Zaragoza Museum is closed and has loaned a few of its artifacts to be displayed elsewhere. This one exhibition displays items that were originally part of personal collections and were donated to the museum. The Colección Federico Torralba, comprises religious items and art pieces from China and items from Japan. The Colección Víctor Pasamar Gracia and Colección Miguel Ángel Gutierrez Pascual have woodblock prints – landscapes, noh [能], kabuki [歌舞伎], even modern ones. The. Finally, the Colección Kotoge displays lacquered tea bowls (chawan [茶碗]). There are also modern calligraphies, paintings, and the compulsory samurai armour. The regional government has undertaken buying artefacts to engross the Asian collections. Though they looked a bit out of place in the historical building, the items were fantastic – and you could even make your very own “woodblock print” at the end.

Zaragoza exchange ceiling, decorated with architectural flower-like patterns

Though the exhibition was the reason I had wanted to go downtown, after I left the (nicely air-conditioned) Lonja, I still had some time to do stuff. I wandered back into the cathedral for a bit – between the 17:00 mass and the 18:00 mass, and left before the second one started.

I continued towards the Roman Walls Murallas Romanas de Zaragoza, which sadly have had to be fenced off because people have no respect (I vividly remember a mum letting her toddlers to climb all over them one time I visited). At the end of that square stands the marketplace Mercado Central de Zaragoza, a wrought iron architecture building designed in 1895 by Félix Navarro Pérez. Being a Friday evening, in the middle of summer, many of the stands were closed, so it was not crowded.

Zaragoza Roman ruins

Iron and glass architecture market

I continued towards the Fire and Fireforce Museum Museo del Fuego y de los Bomberos, where a nice gentleman wanted to give me a guided visit which I declined. Honestly, I just wanted to look at the old fire trucks (and actually, support any initiative by firefighters if it helps fund firefighting). It is a little quaint museum located in part of a former convent, the other half is an actual fire station. The exhibition covers documentation of historical Zaragoza fires, firefighting equipment, a collection of helmets, miniatures, and quite an impressive collection of vehicles used to fight fire. There were two immersive rooms, one which showed damage to a house and another about forest fires. I really enjoyed it, though I only had a quick visit – they closed in an hour, and I was the only guest along a family.

Firefighting museum: collection of vintage vehicles in a brick cloister

On my way back towards the hotel I walked by CaixaForum Zaragoza, where they were running the Patagonian dinosaurs Dinosaurios de la Patagonia. Seeing the Patagotitan on the balcony made me want to go in, but I had already seen it, and I knew I was just on a palaeontology high.

Patagotitan installation on a balcony

I headed back to the hotel – crossing a couple of quite unsavoury neighbourhoods – and bought some fast food dinner again. It was stupidly early, but after eating I could have a shower and relax on the bed while I studied the route for the following day. Furthermore, it was so hot I really needed that shower, and I knew I would not be going anywhere after taking it. Thus, I showered and plopped down to watch the Natural Science Museum’s YouTube Channel after I had learnt how to get out of the city.

17th July 2025: Hands on in the lab! {Dinosaur Eggs Loarre & Zaragoza, July 2025}

I got up around 7:30 and got dressed. I finished packing and before breakfast I took my luggage to the car, as I was leaving Loarre in the evening and I had to clear the room. Since I was outside, and the sky was clear, I went to explore the village a little more. There were some fountains and older farmhouses – one of them had been transformed into the rural hotel which never replied to my query. Some buildings had decorated their windows with cute homemade mascots.

Old Loarre Townhall, turned hotel (this is where I stayed)

Walk around Loarre: rhino mural, fountain, old house, wash house

At 8:30 I went back to the Hospedería de Loarre for breakfast. Since there was nobody at reception, I asked the lady at the restaurant what to do with the key when I left the room. I had my coffee(s) and toast, grabbed what I needed for the day, dropped off the key, and headed to the museum-lab for the third day of the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs. Today was the day when we would work hard at the laboratory.

The Restoration Lab in Loarre

Once again we got divided in three groups. One group opened a cast jacket using a radial saw – no way I was going to try and operate heavy machinery. Opening the jacket is the first step to study what it has been protecting, now that it is safe in the lab. The cast is removed in layers, and the rock is processed so the matrix (everything which is not actual fossil) is removed from around the eggs. Afterwards, there are two jobs. One is going through the discarded matrix / sediment for any and every interesting thing that can be found. The second is cleaning up the fossilised egg or eggs from any extra sediment to reveal their actual shape and colour.

I started with the cleaning crew (again). Under Ester Díaz Berenguer’s guidance, we worked on chemically removing sediment from a fossilised egg using alcohol diluted in water and brushes. It was a slow but very Zen work – wax-on-wax-off kind of thing. The others in my group sounded a bit frustrated with the task, but I guess it’s because they were younger people and more impatient? I know that I did not finish cleaning one shell fragment after an hour, but I was just… aware that fossil prep was a slow process?

Chemical clean up of fossil egg using a brush

My second activity was also cleaning, but this time mechanically, using an air pen to remove as much of the remaining matrix as possible without damaging the general structure. This step would actually happen before chemical clean-up. The air pencil is a pneumatic tool so you really don’t have to press against the rock, to see the sediment peel away. It’s even more Zen than the chemical clean up – unless you’re working on a fragile bit. The important thing is to always clean away from the shells. I worked on that for another hour or so, and I even got to use some gluing materials to make sure a crack did not cause a problem – that was the bit that was more stressful, worrying I might damage the fossil.

Mechanical cleaning of fossils using an air pen

We had a short break which I used to go to the car to organise the car boot – I had thrown all my things there, but a classmate had asked me to drive him to Saragossa, and I had to adjust for his luggage to fit too. Then my group moved onto studying the removed matrix from a jacket, under the direction of Manuel Pérez Pueyo. This consists on checking bags upon bags of broken rock bits to find anything that could be an eggshell. Though the main find of the Santa Marina site are the sauropod eggs, there are eggs belonging to other species – crocodilians and theropods. You weigh some sediment, spread it on a tray and move it around until you’ve taken out anything that can be useful to science. You have a microscope handy in case you need it. I am proud to report that during my three rounds, I did not miss anything key (before you discard your sediments, you call an expert to recheck). I did not find anything out of the ordinary, but I pulled out a couple dozen egg shell fragments.

Sediment being checked for loose egg shells

At the end of the morning, I snooped around what they were doing on the opened cast jacket, and someone was using the air pen on it, trying to locate the eggs. The jackets are opened upside down, so there’s a bit of detective work to find the fossils again. In order to protect the eggs, the casts are made big enough to protect them from any saw, so casts may be huge (and of course heavy). Thus, a lot of cleaning work is required at the lab, which translates in an insane amount of time. The palaeontologists must find an equilibrium amongst protection, weight, and lab-work when deciding on the size of the cast.

Upside down cast jacket that has just been opened. The job is cleaning out all the sediment around the eggs.

For lunch, all of us went to Casa Lobarre, the village restaurant, I think a concession from the town hall, as it is in the same building. The inside is decorated with reproductions of Romanesque frescoes and painted to look like a castle, as it was used as the set in a film some time ago (Kingdom of Heaven, 2005 I think. Don’t quote me on it). They offered a set menu with the choice of a (hearty) starter, a main course, and a dessert, drinks included. It was a big lunch! I ordered stuffed courgette and assorted grilled meats. The food was quite all right, especially for the price, and the desserts were handmade.

Afterwards, we had two lectures. One was given by Manuel Pérez Pueyo, who explained to us the hard science data of the Garum facies, which could be the key to understanding the last dinosaurs surviving in Europe. He also talked about the K-Pg limit and dinosaur extinction. He also made a comparison between the little Santa Marina site with the American Hell Creek formation – as the presentation said… size matters. That’s why there have been so many dinosaurs found there, compared to the more humble sites in Spain.

The final lecturer was José Ignacio Canudo Sanagustín, the director of the University of Saragossa’s Natural Science Museum Museo de Ciencias Naturales de la Universidad de Zaragoza. He explained how a museum works (I was reminded me of the visit to the inner works of the geomineralogical museum in Madrid), and the museum-lab status. The Saragossa Museum, as an institution, is the custodian of the Loarre fossilised eggs, even if they stay in the Laboratorio Paleontológico de Loarre. This is not unique to this village, as there are several similar schemes in place all throughout Aragón, known as “satellite sites” or “remote halls”.

Canudo also talked about counterfeit fossils – a reason why I only buy my fossils during Expominerales or Expogema, I don’t trust random vendors. Then, he moved onto the topic of the Museum itself – how it works, what kind of items they hold, how they came into the museum, and a little pride-flex, that they are home to a whooping 319 holotypes (the specimen that is used to describe a species), mostly from the Aragón region. The museum only exhibits a tiny proportion of the treasures that are deposited there for their protection and research.

Towards the end of the evening, we hopped onto the vans yet again to head to the middle of nowhere for some amazing views of the castle. No, really. We were headed to another “palaeontological site”. It turns out that a few years ago, a farmer was ploughing his land and found a few slabs of rock which he discarded to the side. These slabs held footprints from hornless rhinoceros from maybe 15 – 10 million years ago. The slabs are haphazardly stacked with the footsteps on the underside, which is great for conservation. Also, the way is so unkempt that nobody would get there to damage them for kicks and giggles, which is good too. We had to waddle through thistles and dry plants about hip-height to get there, then climb up the rocks so all of us could get a look. Afterwards, we found a shaded spot to talk – and the professors brought cold drinks (and chocolate) again for the hike. They were crazy prepared.

Loarre castle

Here’s the thing with the rhino footsteps – scientifically, they’re out of place, so they have lost a good part of their intrinsic / purely scientific value. But legally, they must be protected and conserved. So, what to do with them? It would be expensive to move them, and once they were transported, where would they end up? Neither the lab nor the museum were willing to take them on… Each of the coordinators told us about pros and cons of different actions. In the end, what we were brought to realise was the big discrepancy between what must be done (considering the law), what should be done (considering the science) and what can be done (considering the money). The museum-lab has an idea or two about what to do with them, and I wish they succeed. I really hope the rhino footsteps become well-known some day. That way I can boast I knew them before they became famous…

Slabs of rock in the middle of a hill.

Ancient rhinoceros footsteps

Technically, the day was over then, but the coordinators asked for our help with some stuff – getting the jacket we had extracted from Santa Marina into the lab, and moving one of the display cases to change the exhibit inside. We happily complied with both, being the first to see the new display in the museum. Are we special or what?

New exhibit in Loarre, which has exchanged a jacket for two prepared eggs

Afterwards, my classmate and I set off towards Saragossa Zaragoza. We arranged that I would drive him to my hotel and he would get a taxi from there. The drive from Loarre to outer Zaragoza takes about an hour, but once you get into the city itself, all bets are off. Furthermore, Google Maps had given me some strange instructions to enter Saragossa, but fortunately, traffic was light, as I had predicted / hoped. The hardest part getting to the hotel parking lot – I had to go to the hotel first (and find a parking spot for that) to check in, and get the key to the parking lot, then drive there. Of course, the only place I could drop off the car near the hotel was a one-way street in the opposite direction from what I needed, with no convenient turns allowed. In the end, it took 20 minutes to be able to leave the car, but it was really the most convenient option. Zaragoza is really not made for visitors to park in the streets, even if the hotel was far from the centre. It was the closest to the university as I had been able to find so the next day was nice and easy.

It was insanely hot, sticky hot, and I needed some dinner. I found a nearby fast food place and headed back to the hotel room with take-out. I finally had a long shower – this was a bit of a theme during this trip, wasn’t it? The room was small and a bit claustrophobic (honestly, it reminded me a little of a prison cell), and the air-conditioning machine was right above the bed, so it was a bit tricky to find the correct temperature / fan combination. I was tired, but stupidly alert, so it took a while to fall asleep.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

16th July 2025: Santa Marina Palaeontological Site {Dinosaur Eggs Loarre & Zaragoza, July 2025}

In our second morning in the Loarre course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs, we met at 9:00 in the museum-lab Laboratorio Paleontológico de Loarre. The first thing we did was pick up our PPE – glasses, earplugs, facemask and work gloves. For the day we would be cared for by Miguel Moreno Azanza, Lope Ezquerro Ruiz, Ester Díaz Berenguer, Manuel Pérez Pueyo and Laura De Jorge i Aranda.

Miguel Moreno Azanza and Lope Ezquerro Ruiz are the course coordinators. The former is holds a PhD in Geology and is a Postdoctoral fellow in the Saragossa university Universidad de Zaragoza. He is the egg expert and the leader of the works in Loarre. Ezquerro Ruiz is now a Lecturer at another University, Universidad Complutense (Madrid), but he has not lost contact with the dino-egg world. He is the expert sedimentologist, described as an “all-terrain geologist”. Ester Díaz Berenguer did her doctorate about ancient manatees, once dug a sauropod skeleton all by herself, and is the Natural History collection curator in the Natural Science Museum of the University in Saragossa. Manuel Pérez Pueyo holds a postdoctoral position in the university Universidad del País Vasco and is currently away in Romania, studying the same kinds of sediments the Loarre eggs are found in – he is the K-Pg Limit expert. And finally, Laura De Jorge i Aranda is the de facto boss – she is the main restorer and conservation expert in the lab, so what she says, goes. If she ever stays still for long enough to finish saying it, because she must be related to the Duracell bunny…

We hopped onto the vans, and drove / bounced off towards the actual palaeontological site: Yacimiento de Santa Marina, the outcrop where the eggs were first found. Around 6 km away from the village, the area of the site is around 500 square metres, and eggs could be found from the surface (originally, those have been excavated now) to almost 2 m deep. It is mainly comprised of red clays hardened into actual rock, whose age is disputed between around 70 and 66 million years ago. Fragments of egg shells can be found on the surface, easy to tell apart. While the clays are mainly reddish, the egg shells are dark grey / blue, three millimetres wide, clearly rounded and with clearly-visible pores on the outer surface. And no, finding one of the dozens of them that we saw never got old. They have found six or seven groups of eggs there, so the upcoming steps are extracting them and working out if the groups are actual nests or just casual accumulations due to transport or other causes.

Yacimiento de Santa Marina - red hard unforgiving rock full of dinosaur eggs if you dig hard enough

There were three jobs to do around the site – cleaning up an area where eggs had already been found to check for more, repairing a cast jacket which had been damaged, and extracting a cast jacket which was ready to be transported to the laboratory. I started with the clean-up team. There, we used the “small” equipment (cleaning brushes, paintbrushes, and screwdrivers) to remove sediment and small rocks trying to see if there were more eggs around or underneath the one that had been removed. It was a definite maybe.

A spot in the ground where an egg was found. It has to be cleaned (swept) to check if there are more eggs or eggshells

The professors had brought Coke, Aquarius and pastries for breakfast at the mountain hut next to the hermit church Ermita de Santa Marina, which lends its name to the site, and thus we had a break around noon – the museum-lab team had brought us snacks and drinks. Afterwards, my group moved onto recasting a jacket which protects what could be a whole nest inside. The whole thing is massive and thus heavy, so difficult to move. While the logistics for that are being taken care of, the cast jacket protects the fossils inside, and the whole thing is kept buried to prevent weathering.

In Spanish, the cast jackets are called momias, mummies, as they are wrapped in gauze or similar before. Unfortunately, that degrades with time and weather. In order to protect the fossils, three of us applied a layer of cellulose (read: wet toilet paper) first, while the other two made burlap stripes that would go between the cellulose and the plaster. Later, another group would make and apply the new cast, and the following day the professors came back the next day to rebury it for extra protection.

Giant cast protecting fossil eggs before and after getting some TLC and new plaster

My group’s final job was breaking a plaster cast off the ground. As we worked on the other two spots, the other groups had taken a hydraulic hammer and a giant drill to the rock surrounding the cast to get it ready for extraction.. I got to work on the drill – while one of my peers pushed the tool into the rock, I was in charge of keeping the drill bit steady. Afterwards, I could hammer one of the stone-splitting wedges into the holes we had drilled, and a group-mate hammered in the other two. The cast was labelled and extra information was written on it: level, north, which side was up. After that, the whole thing was torn off the stand (by sheer blunt force, aka someone pushing it) and rolled onto a net that had to be hauled up the outcrop and then into the van, all that under the incredulous look of a herd of free-range cows which grazed nearby.

Jacket cast of a fossil being broken off the ground with a giant drill, and then transported using a net.

Two cows grazing

The strongest people around loaded the cast and carried it out, then put it in the van. They needed someone to take pictures of the process and I volunteered for that. By then, it was way past 14:30, which meant we were too late to have lunch in Loarre, where apparently it is only served between 14:00 and 15:00. Calls were (sort of desperately) made to find somewhere which would feed our large group lunch. We ended up in the restaurant at the campsite Camping de Loarre, which happily let us have some food there. They offered stuff to share, but we preferred to have individual plates. I think we all wanted something we really… wanted, so we just chose from the main dish options.

I ordered fried eggs with ham and chips. While I prefer my eggs runny, they were adequate. Since I had drunk a Coke for breakfast, I had an isotonic drink instead, and some of the communal water. As I was finishing, I overheard that they had ice cream inside… watermelon ice cream. It was exactly what I needed for dessert. While I was paying, the waiter asked something about whom to charge for the water, so I took care of that. It was still cheaper than buying all the soda and snacks the professors ended up providing.

Camping de Loarre: eggs with ham and a view of the castle

After lunch, we headed back towards the village, where we had a lecture by Laura De Jorge i Aranda on the theory of fossil restoration, conservation and preservation. One of the most important things she mentioned was documentation – as we had seen with the cast we had broken off. Once in the laboratory, the plaster is opened, the sediment classified for later study, the eggs cleaned mechanically and chemically, and any crack sealed with special glue. Every step of the way is documented. Finally, the fossils have to be packed for transport or preservation, and the sediment must be combed for anything of interest it might be hosting, such as loose egg shells (from either titanosaurs, crocodilians or theropods).

We moved then to the museum-lab to apply what we had just learnt in our first hands-on visit to the restoration laboratory. We were provided with a bunch of fossils (newly-discovered spinosaurid bones, so new that they are unpublished and thus cannot be shown) and Ester Díaz Berenguer guided us to make fossil beds with polyethylene covered with tissue. These were to go into fireproof drawers for conservation in the Natural Science Museum in Saragossa. The fossils are laid out on the polyethylene, traced, and the bed is carved for them with scalpels and cutters – remembering to also carve spaces for fingertips, so picking up the item is easier in the future.

A tray with cuts to fit the different fossil bones that we cannot show for scientific reasons, so it just looks like we cut a bunch of holes with weird shapes

After that, Miguel Moreno Azanza showed us some of the prepared eggs. One of the specimens was a couple of eggs stored together (one of them might have a baby inside!). These were found in another site, Collado de la Tallada, which apparently is “easier to dig in”, but we were playing level pro in Santa Marina. Another was a group of five eggs together, which could have been a nest. They are criss-crossed by mini-faults. We were able to snoop around other eggs, as the professors chuckled something like “Don’t worry, you’ll work on them tomorrow”.

Two titanosaur sauropod eggs in a case. They look about as big as the palaeontologist's hands each. They are deformed and broken but have a vague egg shape.

When I signed up for the course, I expected that the “practice” would be standing there while an expert did something. Maybe we would all get one egg shell to touch and share amongst us. That would have been really cool already. But by now I had dug, protected, drilled, pushed, and held fossils. I was ecstatic. The course had blown up my mind already, and there were still two and a half days left.

A titanosaur sauropod egg nest with five or six eggs, deformed and cracked by the passing of time.

I went back to the hotel Hospedería de Loarre to shower, have a snack, and pack all my things as I had to clear the room the following morning. I also studied off the route to get to Saragossa in the evening after the course. During the planning stage, I had considered whether I wanted to go to Saragossa on Friday morning before the lessons or Thursday evening after them, and in the end I decided to drive on Thursday.

On the one hand, it meant driving after the whole day of class, probably tired, and around dusk. On the other hand, it allowed me to do the drive without a time limit constraint, park directly at the hotel, and it might mean less traffic. Furthermore, sunset was at 21:00, and it should be bright enough for a bit still after class. In the end, I decided in the end that it would be less stressful. Thus, Wednesday was my last night in Loarre.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

15th July 2025: The Egg Museum & the Mallos {Dinosaur Eggs Loarre & Zaragoza, July 2025}

I woke up around 7:30. After I had stressed out so much about reaching there, I almost could not believe I was really in Loarre, at the feet of the Pyrenees mountain range. I lounged around until breakfast started at 8:30. I went down and the choice was limited but adequate – fresh bread (still warm, the bakery was literally under my window, and it had been making me hungry for an hour), tomato spread, Spanish omelette, cheese, sausages, pastries, coffee, milk, and an assortment of jams and butter. The coffee was weak, so I had a couple of cups, but the orange juice was freshly squeezed and awesome. I made myself toast with cheese and omelette, loaded up on the caffeine and went on my way. At 8:58 I was at the museum-lab Laboratorio Paleontológico de Loarre (Oodinolab). And there was my name, on the attendance sheet for the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs. Everything was going to be all right. I have to admit I was 100% ready to show all my emails and confirmation should any problem have arisen… but it was all right (which… I should have known due to the email received previously… but I am an overthinker by nature).

After signing attendance and checking details for the certificate, we received a tote bag with postcards, notebooks and pens. The course started with a welcome and introduction by Miguel Moreno Azanza, who is the Universidad de Zaragoza researcher in charge of the lab. The most important goal of the course, he transmitted, was empowering us with knowledge about every step involved in fossil-handling: from digging to commercial exploitation, including geology, conservation, restoration, study and museumification.

The course kicked off with the guided visit of the museum-lab that is usually done for kids and families, including pulling out crates for our backpacks. Thus we learnt about the story of the discovery of the eggs – a fellow researcher of Moreno Azanza’s, José Manuel Gasca, a geologist, runs mountain trail. In 2019, he was training with a few colleagues when during a break he looked at the ground and saw what it looked like a fossilised dinosaur egg. And that is how one of the largest egg-dinosaur sites in Europe was discovered.

From the science standpoint, we also heard about how hardshell eggs played a key part in the evolution of animals coming out of the sea, as they allowed reproduction on land, without having to return to water. There were (are) different strategies to take care of eggs, and spherical eggs mean that they were (are) buried. From fossil tracks, we know that the dinosaur females that laid their eggs in the area buried them for protection using their back legs. We saw two cast jackets too, ready for research, on display.

Collage showing several exhibits of the museum: two cast jackets (with fossils inside), the first sauropod egg excavated (of course, in broken pieces of shell pressed together), a dinosaur vertebra and a reproduction of a sauropod embryo in an egg.

Fossil eggs are categorised as oospecies, unless or until it can be proven which animal laid them. The Loarre dinosaur eggs are tentatively classified as Megaloolithus siruguei (sometimes spelt Megaloolithus sirugei), laid by a species of titanosaurian sauropod – some candidates are Garrigatitan, Ampelosaurus and Lohuecotitan. Sauropods were plant-eating dinosaurs that moved on four straight legs, and had long necks and tails, such as Dippy, the Diplodocus (and other copies, such as the one in Madrid or Paris). During the Cretaceous period, the dominant group of sauropods were the Titanosaurs, the last surviving long-necked dinosaurs until the extinction of dinosaurs – in South America there was Patagotitan; another example is Qunkasaura pintiquiniestra, which I saw in MUPA and MARPA exhibits.

The first dinosaur eggs ever registered were found in the Pyrenees – on the French side though – by Pierre Philippe Émile Matheron in 1846, and described in 1859 by Jean-Jacques Pouech. In 1967, Pierre Souquet documented dinosaur eggshells around the reservoir La Peña, some ten-ish kilometres from Loarre (had I known in 2021…). These were the same oospecies as the ones in Loarre – since the fossil layer is the same, it makes sense.

We were supposed to have a video-conference inauguration with someone from the university, but she decided to come in person, and that was moved to 19:00. So instead we hopped onto the vans that the organisation had provided and drove towards the geological formation called Mallos de Riglos, in the village of Riglos (hence the obvious name). The Mallos are a number of vertical domes conformed by reddish conglomerates. I had actually seen these geological structures before, from the other side of the River Río Gállego – not up close. The wording of the email “a slight ascent” had not made me suspect at first we were going to climb all the way up in the heat. Looking back, it was not that bad but a) I was not mentally prepared for it, and b) I have a new backpack, and it’s comfortable but… differently-shaped, so my centre of gravity was all off. There, Lope Ezquerro Ruiz (honourable mention to Manuel Pérez Pueyo, who cracked jokes and held the whiteboard) gave us a few good pointers on geology which made me wonder where he was when I was first studying geology at university.

Looking up at the Mallos de Riglos, vertical structures made from reddis conglomerates

Simply put, if one assumes that the natural laws have not changed with time (Uniformitarianism), then three things happen that define geology: strata deposits are horizontal, deeper strata are always older, and if they are not, it is because something new has eroded or deformed them. Of course, the Pyrenees mountain range is anything but flat.

Pyrenees geological structures on the side of the mountain, from the mountain opposite the river - erosive walls, faults and folds

On site, we learnt about the Garum facies, the result of the sedimentation of fluvial and marshy red clays. The layer started forming during the Maastrichtian (the latest age of the Upper Cretaceous, 72.2 to 66 million years ago. Both the Maastrichtian and the Cretaceous ended with a literal bang – the Cretaceous–Palaeogene extinction event, when non-avian dinosaurs went extinct, marked by the K-Pg boundary (formerly K-T boundary), a layer of sediment rich in iridium which probably came from a meteorite impact. The deposit of Garum facies continued through the first age of the Paleocene, the Danian. This means that the K-Pg boundary is somewhere inside the layer, which is pretty cool. And even cooler? There are dinosaur eggs there, obviously from before the mass extinction.

We learnt about this literally standing on the Garum itself. We talked about the time when the a lot of the Iberian Peninsula was a shallow sea with scattered islands, and then sat to try and “see” the processes of folding, faulting and erosion that created the Pyrenees mountain range as the African tectonic plate pushed against the Eurasian plate.

Reddish rock on the ground, called the garum facies

Every now and then, a vulture flew above us, in wide circles. We were apparently not appetising, because it flew away every time. Once we tackled the descent, we headed towards Ayerbe, where we split up for lunch. At 16:00 we met up again so professor Lope Ezquerro Ruiz could demonstrate how strata bend and break using a model and sand. Afterwards, we drove back to Loarre.

Griffon Vulture mid-flight

Walking down the Mallos de Riglos, with two vertical walls at the sides and a river-valley in the background

Simulation of how folding ocurs in rocks using sand

In the modern town hall, we had the first lecture of the afternoon, by José Luis Barco, Manager of the business Paleoymas, a company specialised in protection, development, management and use of cultural and environmental assets, with a strong emphasis on palaeontology and geology. One of their work lines is monetising projects related to palaeontology, as opposed to the “research-focused” stereotype. Between a palaeontological discovery and its communication or exploitation for the general public, there is a gap that can last over a decade.

Paleoymas is responsible for the project Paleolocal, which created the museum-lab in town, with the idea of studying the fossil eggs almost in situ, which would develop a touristic resource and help the village profit from it. The museum-lab is technically part of the Natural Science Museum Museo de Ciencias Naturales de Zaragoza, which has custody of the fossils according to the regional law. However, keeping the eggs in Loarre is a way to involve the community into protecting the palaeontological site, as well as to create a tourist flow to the village itself. See: yours truly, who spent 240 € in lodging there.

The second lecture was given by Miguel Moreno Azanza, who talked about the Theory of Excavating a Palaeontological Site, as one of the activities in the course was working on the field. The summary could be: “forget Alan Grant with a paintbrush, think hydraulic hammer”, but the important lesson is “do not dig up anything you cannot take with you, and register any and everything you see / do / touch”. Also, regarding egg shells, it’s important to write down whether you find them concave up or concave down. This can help decipher whether the egg has rolled or not (for example, if several eggs are found together, were they in a nest, or where they moved there somehow? Did a baby dinosaur break the eggshell?).

Around 19:30, we had the official inauguration of the course, with a representative from the university, Begoña Pérez, and the mayor of Loarre, Roberto Orós, who was nice enough to buy us all a drink afterwards. Not one to turn down a free Coke, I tagged along for a while, and when people started taking their leaves, I returned to my room. I had some crisps in lieu of dinner, took a long (and I mean long) shower, scribbled down some notes and lay down till it was time to sleep.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

14th June 2025: The road to Loarre {Dinosaur Eggs Loarre & Zaragoza, July 2025}

The closer the day came, the more nervous I got. First, there was the drive. It would be a long drive on my own, during the pre-holiday rush, and I had to go around Zaragoza (Saragossa), which has a notorious knot of connections. I had studied the route up and down with both Google Maps and my Sat-Nav. However, I could not control traffic nor other drivers. And secondly, that weekend there had been torrential rain alerts in the area. The last thing I needed was a flash flood.

I pumped fuel before I went to work in the morning as I had a cheap petrol station on the way. When I finished at 15:00, wrapped up, said my goodbyes, and headed off. I had a swing of water and set on the road, with the goal of taking a break in an hour or so. I had over 360 km to drive through, most on the A2 speedway, then a national road, and a final local road. The first 20 km or so were the worst, with lots of traffic and lorries because I was right in the middle of a logistics hubs. For the next 100 km or so, as I went north, I had the pleasure of getting caught in a few “lorry overtaking lorry” instances (sometimes even “lorry overtaking lorry overtaking lorry” ones, when there were three lanes), with the slowest lorry going at 110 kph and the overtaking one at 111 kph on a 120 kph speed limit.

I was surprisingly not tired, but I forced myself to make a stop around 17:30 to have a caffeinated drink and one of the sandwiches I had prepared, then continued on. I found some construction work which created a traffic jam that got us to a near stop for about 20 minutes around 18:00, maybe. I managed the Zaragoza exchange and drove successfully onto the following speedway (A-23) – from there, it was about another hour. When I reached Huesca, the exchange was easier, just a turn left into the national network (A-132). The last 34 km were on the local road (A-1206 – the lower the number, the “better” the road is), and took a bit longer than expected due to getting stuck behind a tractor and a harvester for the last stint. I finally reached Loarre around 19:20. I found a convenient (and legal) parking spot in one of the outer streets, and walked to my accommodation.

The hotel Hospedería de Loarre is located right in the Main Square of the village, roughly a three-minute walk away from the street where I had parked, and four minutes from the main road. When I checked in, the worker made some conversation and asked me why I was in town. Upon explaining that I had come for the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs, I was told that I was “the one from close-by”. Considering that I had driven for over 360 km, that shocked me. The worker explained that the previous people who had checked in before me, who were also there for the course, came from Chile and Mexico! I was the one from close-by indeed, and one of the three people from the course staying at the Hospedería. The network Red de Hospederías de Aragón comprises a group of hotels in historical buildings within areas with high tourism potential. The Loarre one is located in a palatial house, the former town hall, which was rehabilitated recently.

After check-in, I went for a walk for an hour or so. I saw the church Iglesia de San Esteban and the cross that marks the end of the village Cruz de Término. I also found the laboratory or “museum-lab”, Laboratorio Paleontológico de Loarre, which is a tiny building painted in bright colours and silhouettes of sauropods (though it shall soon move to a bigger one).

Romanesque church

Building with dinosaurs painted on it, the museum-lab in Loarre

The castle Castillo de Loarre was not too far away (walking route was about an hour). I had visited it before, so I did not need to see it again, but I would have liked a picture of the walls that I was unable to get due to a lack of perspective. Unfortunately, as I considered the hike, a storm cloud rolled by. There was ominous thunder, and a few raindrops fell. If I continued on my walk, I was sure I would get drenched. If I decided to go back, the second I got out of the shower and into the pyjamas, it would stop raining. The area had been on alert due to rain and flash floods all weekend too…

Loarre castle from the valley

A huge thunderclap helped me decide to head back.

Storm rolling in over the cultivated fields near Loarre

When I pulled up my toiletries, the sun lotion had not been well-closed, so I had to wash all the stuff. At least my chapstick wouldn’t get sunburnt? Then, I headed into the shower, and when I came out, it had indeed stopped raining. However, the cloud was still there, and I did not trust it… Oh, well. There would be other chances, I thought.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

14th – 19th July 2025: Loarre & Zaragoza Summer University (Spain) {Dinosaur Eggs Loarre & Zaragoza, July 2025}

Sometimes I get weird ideas stuck in my head. I usually let common sense override them, but this time the temptation was too great, so I allowed myself to do something slightly insane. I don’t regret it one bit.

Until a few years ago, my work projects rarely extended past June. Lately however, I’ve had to work well into July, which means I have not been able to sign up for any summer university course. Especially, one summer university course from the university of Saragossa Universidad de Zaragoza called Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs. Until now, I had been working through both editions of the course – usually until the very same day the four-day course finished. However, this year my last day of work was the day before the course started.

I started mulling… what if? What if I signed up? What if I directly drove from work to the site of the course? What if I did something crazy and went to Loarre? It would mean driving for a about four hours through the late afternoon / early evening of the 14th of July, the day before lots of holiday periods kicked off… right after a whole work session. It was not the best of ideas. It was not the most reasonable thing to do. What if I did it anyway?

I made up my mind – I would do it, sanity be damned. My family also offered to subsidise part of the course and accommodation as my birthday present, too (thanks!). I found out all the information and decided to try for the course on the 27th of April. Now, I just had to wait for admission to open, sign up, be accepted, and pay. It seemed to be a simple process, like any other course I’ve taken before.

Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs

Except, it was anything but simple.

Sign-up for the Saragossa Summer University, Cursos de Verano UNIZAR usually opens the first Monday of May. That did not happen this year – because 2025 is special? Once I located the correct website, I checked every day – like keeping tabs on concert-ticket information – until a tiny banner reading “sing-ups will open on the 12th May” appeared. Since enrolment did not open a midnight, I deduced that slots would open at 9:00, so I was ready at the computer at that time. The online forms opened indeed around 9:20, but there were only five courses listed on the website, and none of them was mine. The rest opened gradually, but only as numbers… I kept refreshing the webpage until I finally saw my course just after 9:40. I filled in the information, and the webpage said that I would receive an email with confirmation and further instructions.

That email never arrived.

I gave the university a couple of hours, then phoned them up around 13:00. I was told there was a problem with the system and to call the following day if the email had not arrived. Thus, I called around 9:15 on the 13th of May, when I was informed that they had forgotten to activate sending the confirmation emails but not to worry.

On the 15th of May there was a webpage update, saying that the email that had never arrived held confirmation and paying instructions, so I rang the University again. They told me that they would send the information “manually” and “later”. Maybe. The conversation was not really reassuring in tone. I explained that I needed to book accommodation, and they checked again – I was number seven in the list, which meant I was in. They also informed me that there was a partner accommodation on the website – not really, there was a coding error and it did not display. I told the lady so, and she said she would update the webpage. I asked again if she was sure my enrolment had gone through, she insisted that I was in, and the email would come later. Definitely maybe.

I went on Google Maps to check for accommodation in town. Loarre is a 350-inhabitant village famous for its castle and since 2019, its palaeontological sites, where around a hundred sauropod eggs have been found. These eggs were the star of the course Técnicas de restauración en paleontología a través de la preparación de los huevos de dinosaurio de Loarre: Palaeontological Restoration Techniques through the preparation of Loarre dinosaur eggs, from the 15th to the 19th of July 2025. If everything worked in the end…

The accommodation recommended by the University was the campsite, but that was a bit out – it meant driving to the village every day, or a 35-minute walk each way. And that would be nice in the morning, but not after the whole day out. I sent an email to a nice rural cottage which never replied. Then I realised that the course actually was held in Loarre only for three of the four days, the last one would be in Zaragoza (Saragossa) itself. I tried to book at the recommended accommodation, but when they had not confirmed within 48 hours, I just went on a third-party site. I booked a place to stay in the heart of Loarre and a hotel near the university in Saragossa. Of course, a few hours later, the recommended accommodation replied, so I had to cancel. I still reserved everything with full cancellation, just in case. Can you tell I had little confidence in the whole process?

Of course, in between, work tried to change my schedule (already chaotic), because someone needed one of my days in exchange for the 15th of July, which I had to regretfully decline. I hope they don’t hold that against me, but after all the planning and the stress, I did not want to give up the chance to take this course to do someone a favour. On the 13th of June (Friday), the sign-up email arrived, with a payment deadline on the 23rd (Monday) – the course fee was 190 € (160 € discounted). I transferred the money right away, since the following day there would be a bank outage. I also sent proof of payment and a copy of the documentation that entitled me to the discounted price. A few minutes later, someone wrote to me to ask for the discount paperwork. I sent it again.

On Friday the 20th of June, I got a phone call from a long number at work. I rang back. It turned out to be an admin from the summer university asking me if I was still interested because I had not paid yet! I said I had transferred the money, sent the receipt, and the documentation. The person on the other side of the line was surprised for a second, then updated bank data or something, and it turned out that my payment had indeed gone through. Magic! Guess who emailed the University again to have confirmation on writing… It should not be so difficult to… enrol in a course from an establishment that has been offering them for literally almost a century.

To be honest, I was not 100% confident I was really enrolled until I saw my name in the roster the morning of the first day. But it was. Actually, that is a bit dramatic, as on the 7th of July 2025 I received an email from one of the course coordinators, Lope Ezquerro Ruiz with some information. In that email, he explained that some people had contacted them to try and organise transportation, so they were offering to drive people from Saragossa or Huesca on the first day, and back to Saragossa for the last session.

The truth is that public transport to Loarre was a nightmare. That is why I had decided to drive, even if I don’t like it that much, especially in the middle of the holiday rush. Had I known transport from and to Saragossa was a possibility beforehand, I would have planned accordingly. I might have considered taking a railway round trip to Saragossa instead of driving, but by then it was too late to rearrange and change the whole accommodation planning. Furthermore, it allowed me to pack for all kinds of eventualities (yay boot space). In the end, it was way more convenient to have the car, so I don’t regret it.

As the day approached, the weather predictions were al over the place. I decided to pack a bag for Loarre, and a different one for Zaragoza (Saragossa) that I would swap, I also prepared an isothermal bag with frozen water bottles, drinks and snacks – of course, the ice would eventually melt, but I had to leave the car outside while I was at work (and when I came back at 15:00, the the temperature it marked was usually 43 ºC), and I wanted to make sure no fizzy drink exploded. I finally readied an extra bag for “maybes” – extreme cold, extreme heat, rain, extra headwear…

Both the village of Loarre and the city of Zaragoza are located in the area of Aragón, a region of Spain which has gained a lot of traction in the palaeontological world due to the impact of Dinópolis and their exploitation of anything that can be even vaguely related to dinosaurs.

One of the things that surprised me, however, was how Loarre wants to attract tourists but does not seem to be willing to carter to them. I packed snacks for dinner because I was not sure I’d find a place to eat or a shop, and I was right. On Wednesday, we were too late for lunch and had to find alternative plans, and the Hospedería decided that they would not offer food in the evening because the cook had hurt her foot.


 
If you are interested in the “hard science” of what I learnt and will summarise here, I recommend these sources (in Spanish) by part of the course professors:

  • Moreno-Azanza, Miguel; Ezquerro, Lope; Pérez-Pueyo, Manuel & Gasca, José. (2021). Huevos de dinosaurio en las Sierras Exteriores de Huesca. You can read it here.
  • Díaz Berenguer, Ester & Canudo, José. (2024) El Museo de Ciencias Naturales de la Universidad de Zaragoza. Revista PH. 10.33349/2024.113.5663. Available here.
  • Pérez-Pueyo, Manuel; de Jorge, Laura; Ezquerro, Lope; Laita, Elisa; Moreno-Azanza, Miguel; Díaz Berenguer, Ester; Núñez-Lahuerta, Carmen; Barco, José; Cuenca-Bescós, Gloria & Canudo, José. (2023). Paleontología de proximidad: cómo fijar el patrimonio en el medio rural. Found here.
  • The museum-lab Laboratorio Paleontológico de Loarre website.
  • The company that manages the private side, Paleoymas website.
  • The Saragossa University Natural Science Museum Youtube channel.