Ames Limestone

The Ames Limestone is a geologic formation in Ohio, Kentucky, Pennsylvania and West Virginia. It is part of the Conemaugh Group. Formerly know at "Crinoidal Limestone" and "Green Fossiliferous Lime" it was renamed to Ames.
Fossils of Echinoderm, Brachiopod, and Gastropoda are commonly found in the Ames.

Description

The Ames is a thin Marker bed of Limestone and/or Fossiliferous limestone. It marks a transition from a predominantly marine environment to predominantly alluvial environment. The Ames serves as a marker for the boundary for the Casselman Formation and the Glenshaw Formation.