Ammonite partial shell (Cretaceous period, 75 million years old) from Carlsbad, CA at San Diego Museum of Natural History. CA.

Ammonite partial shell (Cretaceous period, 75 million years old) from Carlsbad, CA at San Diego Museum of Natural History. CA.
Photo by Jim Steinhart © 2015, all rights reserved. (Ref: CADPBN43)

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