Description
Fossiled Cenoceras ammonites in Jurassic limestone on the foreshore at Lyme Regis in Dorset. Spiral-shelled ammonites were one of the most numerous sea creatures, however they, along with many other species, were decimated by the Permo-Triassic extinction event that came directly before the onset of the Jurassic period. These animals are the ancestors of today’s nautilus.
