Placenticeras Ammonite Fossil Texas 9 1/2 inches #17615

Up for sale is a large Placenticeras ammonite fossil.   This fossil was found in the Eagle Ford Formation, near Fort Worth Texas.   It dates back to the Cretaceous time period.   Ammonites were soft-bodied marine molluscs that lived in a spiral, compressed, multi-chambered shells.   The outermost chamber of the shell housed the animal itself.  The earliest ammonites appeared during the Devonian time period, about 400 million years ago, and the last ammonites vanished in the Cretaceous time period, approximately 66 million years ago, as a result of the K-T event, that killed the Dinosaurs.