Texas Ammonites
The ammonites first appeared in the Devonian period and were extinct by the end of the Cretaceous period. They developed into many subclasses. They can be found in most parts of the world. No attempt will be made here to identify the different subclasses. Nearly all were coiled ,but a few developed different forms.

ammonite

hamite

turrilites

ammonite

ammonite

ammonite

ammonite

ammonite showing internal segments