Ames Limestone
Stratigraphic range: Carboniferous ~303.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Fossiliferous Ames Limestone (Morgan County, Ohio)
Type	Member
Unit of	Conewango Group
Sub-units	None
Thickness	1 - 4'
Lithology
Primary	Limestone
Location
Region	Ohio,  Pennsylvania,  West Virginia
Country	United States
Type section
Named for	Amesville, Ohio

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.^[1]

Fossils of Echinoderm, Brachiopod, and Gastropoda are commonly found in the Ames.^[2]

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. ^[2]