Columbus Limestone
Image:StromatoporoidSideDevColumbus.jpg|thumb|Side view of a stromatoporoid in the Columbus Limestone at Kelleys Island.
The Columbus Limestone is a mapped bedrock unit consisting primarily of fossiliferous limestone. It occurs in Ohio, Pennsylvania, and Virginia in the United States, and in Ontario, Canada.
Description
Depositional environment
The depositional environment was most likely shallow marine.Stratigraphy
The Columbus conformably overlies the Lucas Dolomite in northeastern Ohio, and unconformably overlies other dolomite elsewhere. It unconformably underlies the Ohio Shale in northwestern Ohio and the Delaware Limestone in eastern Ohio.Its members include: Bellepoint, Marblehead, Tioga Ash Bed, Venice, Delhi, Klondike, and East Liberty.
Notable Exposures
- The type section is located in Columbus, Ohio.
- The glacial grooves on Kelleys Island are cut into the Columbus Limestone. It is also quarried there.
- An exposure in Ontario is located at Ingersoll, Ontario.
Fossils
The Columbus Limestone contains brachiopods, trilobites, bryozoans, mollusks, corals, stromatoporoids and echinoderms.Due to their mid-continent depositional environment, the fossils are almost free of deformation caused by tectonic activity common in the Appalachian Mountains.
Corals
| Taxon | Species | Notes |
| Prismatophyllum | P. rugosum | |
| Hexagonaria | H. anna | |
| Eridophyllum | E. seriale | |
| Synaptophyllum | S. simcoense | |
| Amplexus | A. yandelli | |
| Zaphrenthis | Z. perovalis | |
| Heterophrentis | H. nitida | |
| Cystiphylloides | C. americanum | |
| Odontophyllum | O. convergens | |
| Siphonophrentis | S. gigantea | |
| Hadrophyllum | H. dorbignyi |