Ammonites
Approximately 60-500 million years old, ammonites are an extinct form of mollusk, related to the octopus and nautilus. There are many different kinds of ammonites, depending on the species and on the type of mineral replacement during fossilization. Their name comes from the spiral patterns in their fossilized shells. Pliny the Elder called them ammonis cornua ("horns of Ammon") because they resemble ram's horns typically worn by the Egyptian god Ammon. Found world wide, famous fossil beds of ammonites are found in Madagascar, Gemany, England, Peru, and Morocco.
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