Iridescent Ammonite

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Quick Overview

A whole ammonite with light iridescence on one side and darker on the other. 

Location: Mahajanga, Madagascar 

Time Period: Cretaceous, 120 MYO

Measurements: ~3" long x 2" wide x 3/4" deep

More Information

Ammonites are an extinct group of marine animals in the Cephalopoda class. They are invertebrates and are more closely related to coleoids (squids, octopus, and cuttlefish) than they were to the chambered nautilus, even though they looked much more similar to the later. The name Ammonite was derived from "ammonis cornua," translated to mean Horns of Ammon. Ammon was an Egyptian god that was typically depicted wearing ram's horns, whose spiraled shape is similar to that of an Ammonite. Ammonites first appeared in the oceans during the Devonian Period, some 400 million years ago. They died out around 65.5 million years ago along with the dinosaurs.