Ames Limestone
{{Infobox rockunit
| name = Ames Limestone
| image = Fossiliferous limestone (Ames Limestone, Upper Pennsylvanian; Bloom Township, Morgan County, Ohio, USA).jpg
| caption = Fossiliferous Ames Limestone (Morgan County, Ohio)
| type = Member
| age = Carboniferous
~{{Fossil range|303.7}}
| prilithology =Limestone
| otherlithology =
| namedby =
| region = Ohio, Pennsylvania, West Virginia
| country = United States
| coordinates =
| unitof =Conewango Group
| subunits =None
| underlies =
| overlies =
| thickness =1 - 4'
| extent =
| area =
| map =
| map_caption =
}}
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.{{Cite web |title=Geolex — Ames publications |url=https://ngmdb.usgs.gov/Geolex/UnitRefs/AmesRefs_86.html |access-date=2023-09-07 |website=ngmdb.usgs.gov}}
Fossils of Echinoderm, Brachiopod, and Gastropoda are commonly found in the Ames.{{Cite web |date=September 2023 |title=Sedimentation in Western Pennsylvania |url=https://sites.pitt.edu/~harbert/penna_geology/sediment.html |website=University of Pittsburgh}}
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.