San Francisco Frontiers - Eggs en Provence: France's unique dinosaur egg trove

These are not any old fossils, but 75-million-year-old dinosaur eggs.

Little luck or skill is needed to find them: scientists believe that there are more dinosaur eggs here than at any other place on Earth.

The area, closed to the public, is nicknamed "Eggs en Provence", due to its proximity to the southeastern city of Aix en Provence.

"There's no other place like it," explained Thierry Tortosa, a palaeontologist and conservationist at the Sainte Victoire Nature Reserve.

"You only need to look down to find fragments. We're literally walking on eggshells here."

Around 1,000 eggs, some of them as big as 30 centimetres (12 inches) in diameter, have been found here in recent years in an area measuring less than a hectare -– a mere dot on a reserve that will span 280 hectares once it is doubled in size by 2026 to prevent pillaging.

"We reckon we've got about one egg per square metre (11 square feet). So there are thousands, possibly millions, here," Tortosa told AFP.

"Eggs" is not in the business of competing with other archaeological sites -– even though Tortosa finds the "world record" of 17,000 dinosaur eggs discovered in Heyuan, China, in 1996 vaguely amusing.

"We're not looking to dig them up because we're in a nature reserve and we can't just alter the landscape. We wait until they're uncovered by erosion," he said.

"Besides, we don't have enough space to store them all. We just take those that are of interest from a palaeontology point of view."

- Holy Grail -

Despite the plethora of eggs on site, the scientists still have mysteries to solve.

Those fossils found so far have all been empty, either because they were not fertilised or because the chick hatched and waddled off.

"Until we find embryos inside -– that's the Holy Grail -- we won't know what kind of dinosaur laid them. All we know is that they were herbivores because they're round," said Tortosa.

Fossilised dinosaur embryos are rarer than hen's teeth.

Palaeontologists discovered a tiny fossilised Oviraptorosaur that was at least 66 million years old in Ganzhou, China, around the year 2000.

But Tortosa remains optimistic that "Eggs" holds its own Baby Yingliang.

"Never say never. In the nine years that I've been here, we've discovered a load of stuff we never thought we'd find."

Which is why experts come once a year to search a new part of the reserve. The location is always kept secret to deter pillagers.

When AFP visited, six scientists were crouched under camouflage netting in a valley lost in the Provencal scrub, scraping over a few square metres of clay-limestone earth, first with chisels, then with pointy-tipped scribers.

"There's always something magical -- like being a child again -- when you find an egg or a fossilised bone," specialist Severine Berton told AFP.

- Unique -

Their "best" finds -– among the thousands they have dug up -- include a small femur and a 30-centimetre-long tibia-fibula. They are thought to come from a Rhabdodon or a Titanosaur -- huge herbivores who roamed the region.

In the Cretaceous period (89-66 million years BCE), the Provencal countryside's then-flooded plains and silty-clayey soils offered ideal conditions for dinosaurs to graze and nest, and perfect conditions to conserve the eggs for millennia.

The region, which stretched from what is now Spain to the Massif Central mountains of central France formed an island that was home to several dinosaur species found nowhere else in the world.

Alongside the endemic herbivores were carnivores such as the Arcovenator and the Variraptor, a relative of the Velociraptor of Jurassic Park fame.

In 1846, French palaeontologist Philippe Matheron found the world's first fossilised dinosaur egg in Rognac, around 30 kilometres from Eggs.

Despite efforts to stop pillaging, problems persist, such as when a wildfire uncovered a lot of fossils in 1989 and "everyone came egg collecting", Tortosa said.

Five years later the site was designated a national geological nature reserve, closed to the public -- the highest level of protection available.

The regional authorities are now mulling over ways to develop "palaeontology tourism", a move Tortosa applauds.

"France is the only country in the world that doesn't know how to promote its dinosaurs," Tortosa said.

"Any other place would set up an entire museum just to show off a single tooth."

A.Smith--SFF