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Most Devonian rocks date to the Middle Devonian and outcrop between southern Ohio and Lake Erie. A large unconformity separates Silurian and Middle Devonian dolomite and limestone. The overlying Devonian rocks include the Columbus Limestone to the east of the Findlay Arch and the Detroit River Group carbonates to the west.
The Hamilton Group is a Devonian-age geological group which is located in the Appalachian region of the United States.It is present in New York, Pennsylvania, Maryland, Ohio, West Virginia, northwestern Virginia and Ontario, Canada, [1] [2] and is mainly composed of marine shale with some sandstone.
This article contains a list of fossil-bearing stratigraphic units in the state of Ohio, U.S. Sites. Group or Formation ... Devonian: Bellevue Formation: Ordovician ...
The Cleveland Shale underlies much of northeast Ohio in beds of varying thickness. In northeast Ohio, the member does not appear east of the Grand River. [7] Measurements taken in northeast Ohio show the Cleveland Shale to be 7 feet (2.1 m) [7] to 100 feet (30 m) thick. [9]
Nevertheless, overall Devonian Ohio had a rich fauna including coral reefs, bryozoans, brachiopods, trilobites, cephalopods, clams, crinoids, ostracodes. [4] The rock record of the early Mississippian in Ohio demonstrates the presence of deltas and bodies of flowing water. During the late Mississippian Ohio was covered by a shallow sea.
Berea Sandstone was formed in the Late Devonian period. [10] [11] Prior to the 1970s, it was assigned a Mississippian age. [10]The Devonian-Carboniferous boundary was realigned based on research from Europe, but various geologists were not aware of the changes and so incorrectly assigned Berea Sandstone to the Kinderhookian (early Mississippian).
Eastern North America in the Middle Devonian, showing the Michigan Basin of the Rheic Ocean. In Michigan, the Bedford Shale is found in the southeast along shores of Lake Erie and Lake St. Clair; along the shore of Lake Huron north of Saginaw Bay; along the south shore of the Straits of Mackinac; north of 44 degrees latitude along the shore of Lake Michigan; and in the far southwest corner of ...
Middle Devonian paleogeography. The Cincinnati Arch is a broad structural uplift between the Illinois Basin to the west, the Michigan Basin to the northwest, and the Appalachian Basin and Black Warrior Basin to the east and southeast.