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.
| Columbus Limestone | |
|---|---|
| Stratigraphic range: Devonian | |
 Etched section of hand sample of Columbus Limestone from Kelleys Island | |
| Type | Sedimentary |
| Unit of | Onondaga Group |
| Sub-units | Bellepoint, Marblehead, Tioga Ash Bed, Venice, Delhi, Klondike, East Liberty |
| Underlies | Bass Islands Formation, Delaware Formation, and Ohio Shale |
| Overlies | Lucas Formation |
| Thickness | 0 to 105 feet[1] |
| Lithology | |
| Primary | Limestone |
| Other | Sandstone |
| Location | |
| Region | Cincinnati Arch of North America |
| Extent | Ohio, Pennsylvania, Virginia, Ontario |
| Type section | |
| Named for | Columbus, Ohio |
| Named by | Mathur, 1859 |
Description
editDepositional environment
editThe depositional environment was most likely shallow marine.
Stratigraphy
editThe 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.[2]
Its members include: Bellepoint, Marblehead, Tioga Ash Bed, Venice, Delhi, Klondike, and East Liberty.
Notable Exposures
edit- 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.[3]
Fossils
editThe Columbus Limestone contains brachiopods, trilobites, bryozoans, mollusks, corals, stromatoporoids and echinoderms (including crinoids).
Due to their mid-continent depositional environment, the fossils are almost free of deformation caused by tectonic activity common in the Appalachian Mountains.
Corals
edit| Taxon | Species | Notes |
|---|---|---|
| Syringopora | S. tabulata | [4] |
| Favosites | F. hemispherica minuta | |
| Emmonsia | E. polymorpha | |
| Thamnoptychia | T. alternans | |
| Pleurodictyum | Indeterminate | |
| Coenites | C. dublinensis |
| Taxon | Species | Notes |
|---|---|---|
| Prismatophyllum | P. rugosum | [4] |
| 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 | [5][6] |
Cephalopods
edit| Taxon | Species | Notes |
|---|---|---|
| Werneroceras | W. staufferi | Goniatite[7] |
| Tornoceras | T. eberlei | |
| Goldringia | G. cyclops | [5][8] |
Other Invertebrates
edit| Taxon | Species | Notes |
|---|---|---|
| Spirifer | S. macrothyris | Brachiopod[5] |
| Brevispirifer | B. gregarius | |
| Laevidentalhum | L. martinei | Gastropod[5] |
| Nucleocrinus | N. verneulli | Crinoid[5] |
Fish
edit| Taxon | Species | Notes |
|---|---|---|
| Drepanaspidae | Indeterminate | From the East Liberty Member ("East Liberty bone bed")[6] |
| Cephalaspidae | ||
| Gyracanthus? | ||
| Plectrodus | ||
| Acanthodii | ||
| Machaeracanthus | M. major | |
| "Acanthoides" | A. dublinensis | |
| Coccosteus | C. spatulatus | |
| Ptyctodus | ||
| Rhynchodus | ||
| Palaeomylus | ||
| Cladoselachidae | ||
| Phoebodus | ||
| Onychodus | O. sigmoides |
Age
editRelative age dating of the Columbus Limestone places it in the Early to Middle Devonian period.
Economic Uses
editThe Columbus has been mined for aggregate. Its Calcium carbonate content is 90% or higher.[9]
References
edit- ^ Columbus Limestone, Mineral Resources On-Line Spatial Data, United States Geological Survey https://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=OHDc%3B0
- ^ Ohio Division of Geological Survey, 1990 (rev. 2000, 2004), Generalized Column of Bedrock Units in Ohio; Ohio Department of Natural Resources, Division of Geological Survey, 1p. http://www.dnr.state.oh.us/Portals/10/pdf/stratcol.pdf Archived 2010-02-03 at the Wayback Machine
- ^ Ehlers, G. M., and Stumm, E. C., 1951, Middle Devonian Columbus limestone near Ingersoll, Ontario, Canada, AAPG Bulletin; v. 35; no. 8; p. 1879-1888. August.
- ^ a b Feldman, R.M.; Hackathorn (1996). Fossils of Ohio. Ohio Division of Geological Survey Bulletin 70. pp. 577 [1].
- ^ a b c d e "Biostratigraphic Analysis of Columbus Limestone". 2012-03-03. Archived from the original on 2012-03-03. Retrieved 2024-03-23.
- ^ a b Wells, J.W., 1944, Middle Devonian bone beds of Ohio: Geological Society of America Bulletin, v. 55, no. 3, p. 273-302.
- ^ Sweet, W. C., and Miller, A. K., 1956, Goniatites from the Middle Devonian Columbus Limestone of Ohio, Journal of Paleontology, vol. 30, No. 4, p 811-817. July.
- ^ Flower, Rousseau H. (1945). "Classification of Devonian Nautiloids". The American Midland Naturalist. 33 (3): 675–724. doi:10.2307/2421185. ISSN 0003-0031. JSTOR 2421185.
- ^ GeoFacts No. 25, Ohio Department of Natural Resources, Division of Geological Survey "Archived copy" (PDF). Archived from the original (PDF) on 2011-06-06. Retrieved 2010-01-31.
{{cite web}}: CS1 maint: archived copy as title (link)