*** About Ammonites: Ammonites are an extinct group of marine mollusk animals in the subclass Ammonoidea of the class Cephalopoda. These creatures lived in the seas between 240 - 65 million years ago, their once-living shells often preserved as fossils. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found, can be used to date other rocks. Recognized by their coiled, spiral shells, which are sectional into chambers, they are closely related to living octopuses, squid, and cuttlefish. Ammonites were prolific breeders, survived multiple mass extinctions, and serve as an icon of geological research.

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Image ID: 77821

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