In Mèze the past is just under the earth, mixed with the clay, the roots, the signs of a landscape that today seems quiet and which seventy million years ago must have been a completely different matter. We are in Hérault, a department of Occitania, in the South of France, a few kilometers from Montpellier. Here, inside the Musée-Parc des Dinosaures, a new excavation campaign has brought to light more than one hundred dinosaur eggspreserved in an area of the site that has so far remained little explored. Estimates place them at the end of the Upper Cretaceous, in a window roughly between 74 and 65 million years ago, with many local references speaking of around 72 million years.
The discovery came over the course of a few months, after new research began last autumn. The geologist and paleontologist led the excavations Alain Cabot and his daughter Marina, inside a deposit that Cabot has known for decades and which over time has already yielded eggs, shells, bones and traces of multiple species. This time, however, the concentration has changed scale: eggs close together, arranged in nests, in a quantity that far exceeds the usual findings of the site, where the already known nests generally contained a few units, often four, six, at most a dozen.
The mud held everything
The eggs are large, round, compared in size to a football. The most discussed trail leads to titanosaursquadrupedal herbivorous sauropods, enormous animals, with long necks, capable of dominating the landscape with a presence that today we struggle to imagine without immediately slipping into cinema. In Mèze, prudence remains mandatory: 95% of the eggs are already hatched and the absence of fossilized embryos prevents a certain attribution to the species that laid them. However, the rounded shape, the size and the comparison with other sites, especially South American ones, make the hypothesis of herbivorous sauropods plausible.
The most interesting part, for those who study these fossils, is in the shell. Thickness, microstructure, pores, crystals, surface decorations: every detail works like a small imprint. The analyzes conducted on the eggs and fragments found in the South of France allow us to distinguish different types of fossil eggs and connect them, with caution, to groups of reptiles, birds and dinosaurs. Very particular shells have been described at the Mèze site, including a thick and decorated type, and a small oo-species is also known from the Villeveyrac-Mèze basin, Prismatoolithus cabotiassociated with carnivorous forms.
The landscape that held those eggs was very different from today’s Occitania. At the end of the Cretaceous, southern Europe was an archipelago at lower latitudes, with a region of Mèze described as a large tropical plain crossed by rivers. Dinosaurs must have regularly reached these areas to nest, taking advantage of islets, sediments and humid environments capable of sealing what remained of the nests in the ground.
A crowded nursery
The site had already been known since 1996, when Cabot identified one of France’s large dinosaur egg deposits. The following year the park-museum was born, also to protect the area from looters and improvised collectors, a very real problem when fossils come to the surface and rumors begin to spread. Today the route allows visitors to walk over a real deposit under study, with fossil eggs and bones, and the museum declares that a very large part of the exhibits on display are original.
Within this new portion of excavation, quantity matters as much as arrangement. A hundred eggs concentrated in the same sector suggests a repeated spawning area, perhaps a true collective nesting area. Scholars also look at Mèze because the deposit extends over a very large surface area, around 50 square kilometres, and ideally connects other large European, Provençal and Pyrenean sites. The museum presents it among the most important fossil egg deposits known, while some paleontologists invite us to combine enthusiasm and moderation: in the South of France dinosaur eggs are relatively frequent, and the decisive scientific breakthrough would come from the discovery of an embryo.
This caution changes the strength of the scene little. It’s one thing to find scattered fragments, broken shells, isolated traces. Another thing is to come across such a compact concentration, where each egg adds a detail on reproductive behavior, local biodiversity, the movements of the animals and the environment that hosted them. The Cretaceous of Mèze appears less like a postcard of gigantic monsters and more like a place lived in, crossed, used for laying, abandoned, then covered by time.
Before the asteroid
There is also a broader, almost uncomfortable detail within this story. The fossil eggs from the Upper Cretaceous help to observe the last millions of years before the great extinction of 66 million years ago, the one linked to the impact of the asteroid and the subsequent environmental transformations. At the Mèze site, stratigraphic analyzes and the study of the succession of shells indicate changes in the diversity of the eggs and therefore, indirectly, in the diversity of the dinosaurs present in the area.
Cabot interprets the progressive decrease in the species that spawned in the area as a possible sign of decline that had already begun before the impact. It is a read to be handled with care, because the debate on the extinction of dinosaurs remains complex and intertwines climate, volcanism, ecosystems, geography and final catastrophe. However, the value of a deposit like Mèze lies precisely here: it allows us to look at the last chapters of the world of dinosaurs through an archive that is less spectacular than enormous bones, yet much more intimate. The nests tell of presence, repetition, habit. They tell of life before his disappearance.
Those eggs, almost all empty, have already done their job once. Now they do another one, much slower: they force the present to bend down to the earth and watch patiently. The shells will tell the rest.
