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From Wikipedia, the free encyclopedia
The Kope Formation is one of the three component bedrock formations of the Maquoketa Group that primarily consists of shale (75%) with some limestone (25%) interbedded. In general, it has a bluish-gray color that weathers light gray to yellowish-gray and it occurs in northern Kentucky, southwest Ohio, and southeast Indiana, United States.
| Kope Formation | |
|---|---|
| Stratigraphic range: Katian[1] | |
Photograph and etched section of hand sample of limestone of Kope Formation. Brachiopods and Bryozoans visible. | |
| Type | sedimentary |
| Unit of | Maquoketa Group (in Indiana) |
| Sub-units | Grand Avenue Member, Wesselman Tongue |
| Underlies | Dillsboro Formation and Fairview Formation |
| Overlies | Lexington Limestone, Plattin Formation, and Point Pleasant Formation |
| Lithology | |
| Primary | Shale |
| Other | Limestone |
| Location | |
| Region | Cincinnati Arch of North America |
| Extent | Kentucky, Ohio, Indiana |
The depositional environment of the Kope was shallow marine. The central North American continent was a tropical epeiric sea at the time.
Jennette and Pryor (1993) interpret the Kope, along with the Bellevue and Fairview Formations, as a progradational succession on a carbonate ramp. The Kope is the most distal facies of the ramp complex.[2]
The type section of the Grand Avenue Member is a cliff to the west of Grand Avenue in Cincinnati, Hamilton County, Ohio.[3]
The type section of the Wesselman Tongue of the Kope Formation is an east-facing embankment on an unnamed creek that is followed by Wesselman Road in Miami Township, Hamilton County, Ohio. The embankment is 400 feet (120 m) south of Zion Hill bridge.[3]
Brachiopods, trilobites, bryozoans, rugose corals, and echinoderms (including crinoids, asteroids, and edrioasteroids) are all present in the Kope. Due to their mid-continent depositional environment, the fossils are almost free of deformation caused by tectonic activity common in the Appalachian Mountains.
The brachiopods Dalmanella sp., Hebertella sp., Leptaena sp., Petrocrania sp., Philhedra sp., Platystrophia sp., Pseudolingula sp., Rafinesquina sp., Sowerbyella sp., Strophomena sp., Trematis sp., and Zygospira sp. have been recorded from the Cincinnatian Series, which includes the Kope Formation.[4]
The trilobites such as Triarthrus eatoni, Cryptolithus tessellatus, and Proetidella parviusculus have been identified in the Kope, and the Ohio State Fossil, Isotelus maximus, can most likely be found in it.[5]
The bryozoans Ceramophylla sp., Eridotrypa mutabilis, Peronopera vera, Batostoma jamesi, Dekayia aspera, Heterotrypa ulrichi, Parvohallopora sp., and Amplexopora septosa have been found in the Kope.[6]
Among echinoderms, the crinoids Cincinnaticrinus varibrachialis, Ectenocrinus sp., and Iocrinus sp. are present in the Kope. Edrioasteroids and asteroids (starfish), generally rare, are common in overlying formations, and may be present in the Kope.[7]
A very large and unusual fossil, informally named "Godzillus", was discovered in the Kope Formation in 2011 by amateur paleontologist Ron Fine, of the Cincinnati Dry Dredgers.[8] The reassembled fossil had a roughly elliptical shape with multiple lobes[9] totaling almost seven feet (2.1 m) in length and is believed by Fine to have been nine feet-tall (2.7 m) when upright.[10] David L. Meyer, of the University of Cincinnati geology department, believed it to be a fossilized mat of algae.[11] In 2016, Ron Fine, David L. Meyer, and two other scientists published a study implicating that the fossil might not be a new taxon and could instead have been a complex preservation of trilobites.[12]
Relative age dating of the Kope places it in the Late Ordovician period.
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