Tornoceras uniangulare

Devonian

Squaw Bay Limestone

Alpena, MI USA.

two 32mm and 21mm goniatites on 103mm slab.

Ammonite.  Cephalopod.

Tornoceras is a genus of goniatite ammonite that lived during the Devonian Period.  It is known from sites in New York, Michigan, and Ontario, Canada.