Sunday, April 10, 2011

Unidentified Ammonite

A mineral collector asked me to look at this ammonite fossil he had in his collection.  He could not remember where he had acquired it which is problematic for identification.  I was wondering if anyone has any ideas how I might identify this.  I was guessing it is from Texas and maybe Cretaceous.  It has a pearl like finish on the visible shell.  The other side of the plate is pictured showing a light brown matrix the fossil is embedded in.

The fossil is about 7 inches wide.