Cuyahoga Formation

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Cuyahoga Formation
Stratigraphic range: Mississippian
Meadville Mbr Cuyahoga 042613.JPG
Meadville Shale Member of the Cuyahoga Formation exposed in Lodi, Ohio.
Unit ofWaverly Group
UnderliesLogan Formation
OverliesSunbury Shale
Region Ohio
Country United States

The Cuyahoga Formation is a geologic formation in Ohio. The age of the formation is difficult to determine, because of a lack of diagnostic fossils. Roughly, the formation dates from the Late Kinderhookian (354.8 to 350.8 million years ago) to the Middle Osagean (347.7 to 344.5 million years ago).[1] Eight members are recognized, among them the Orangeville Shale, Sharpsville Sandstone, and Meadville Shale.[2]

It preserves fossils dating to the Mississippian subperiod of the Carboniferous period.[3]

See also[edit]


  1. ^ Ausich, William I.; Guenther, Robert L. (February 1996). "Blastoids from the Cuyahoga Formation of Ohio (Echinodermata; Lower Mississippian)". Kirtlandia: 2. Retrieved April 8, 2018.
  2. ^ Keroher, Grace (1966). Lexicon of Geologic Names of the United States For 1936–1960. Part 3, P-Z. Geologic Survey Bulletin 1200. Washington, D.C.: U.S. Government Printing Office. p. 3552.
  3. ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.