ammonites fossils near digne les bains, in provence

200 aged ago ammonite ammonites ancient antique archaeology bains blayeul cephalopod circles civilization coil creature digne dignes extinct fossil fossile fossilization fossilized fossils france french geological geology gris history jurassic les limestone masonry massif medieval million mineral nature nautilus old paleontology past pre prehistoric provence region ridge rock science shape shell sightseeing slab snail spiral stack stone surface this wall was water years