A large plate showing Talarocrinus patei crinoids of the early Carboniferous Period found in Kentucky.  This plate is on display at the Sm...

A Calymene clavicula trilobite of the Silurian Period found in Indiana, USA.  This picture was taken at Smithsonian Museum of Natural His...

 The Smithsonian Museum of Natural History has a number of Cretaceous Period shell fossils on display from Alabama.  This first picture i...