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Ammonite Fossils - The Promicroceras Planicosta on display at the Smithsonian Museum of Natural History - Washington D.

Ammonites

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

ammonite fossil

ammonite fossil

Fossil Ammonite

Some ammonite fossils bear intricate patterned details on their outer surface called Sutures.These patterns mark where the walls of the chambers, Septum, meet the outer wall of the ammonite shell.