Tag: ammonite
How big is the largest ammonite in the world?
Well known to collectors, ammonites are very common fossils in France. If most are only a few centimeters, the largest specimen found is almost 2 meters in diameter! You will…
A mathematical model to explain the coiling of mollusc shells
What do a snail shell, climbing vines and ram’s horns have in common? All of these biological structures have a spiral shape. To understand the formation of this geometry, a…
The Digne ammonite slab: why such a large concentration of fossils?
Emblematic site of the Haute-Provence geological nature reserve, the Dalle aux ammonites de Digne has an impressive concentration of fossils. In what environment did these Jurassic marine animals settle? Is…