Ammonites are an extinct group of marine invertebrate animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids than they are to shelled nautiloids such as the living Nautilus species.
Ammonite pavement in Lyme Regis, Dorset, Great Britain - a World Heritage Site. We went fossil hunting at Lyme Regis as kids! I took my husband a few years ago and we only found one fossil! I don't think he believed we used to find loads.
A Palaeolithic tool (from the Museum of Archaeology and Anthropology, Cambridge) carefully sculpted around a seashell fossil embedded in the rock. Was the prehistoric took maker thinking about aesthetics and beauty?