The cliff in front of you is formed from limestone and marl, which are sedimentary rocks. So that means that 134 million years ago, this site was covered by the sea which was inhabited by numerous animals such as the ammonites and their predators, the Plesiosaurus and Ichtyhosaurus. To reconstruct a past environment (the paleoenvironment), I study the clues that I find in the rocks and fossils. If you look closely at the cliff, you will notice that there are alternating strata of yellow rock (limestone) and grey rock (marl). These are sedimentary rocks which contain many fossils, especially numerous ammonites. So what can you deduce? Well, 134 million years ago the site of Serre de l’Ane was covered by the sea! Sediment accumulated on the sea bed and formed the limestone and marl that you can see now. The presence of ammonites, such as the Acanthodiscus, allows us to say that the sedimentary rocks were formed in a sea environment because these organisms only lived in the sea and oceans.