Cambrian Monoplacophorans

Fossil monoplacophorans displayed at the Smithsonian Museum of Natural History in Washington D.C.  These fossils are from the Cambrian Period (570-500 million years ago) and were found in Missouri.

Priscacara clivosa Fish Fossil

The fish fossil Priscacara clivosa found in Wyoming (probably Green River Formation).  It lived in the Early Eocene (50 million years ago).  Picture taken in August 2010 at the Smithsonian Museum of Natural History in Washington, D.C.

Forbesiocrinus multibrachiatus Crinoid

This crinoid calyx with a long stem piece attached is the Forbesiocrinus multibrachiatus.  Existing in the early Mississippian Period (345-325 million years ago, Osagean stage) and found in Indiana (probably Crawsfordsville, Edwardsville Formation).  Fossil image created in August 2010 at the Smithsonian Museum of Natural History in Washington, D.C.