Aurora Siltstone Member of Orangeville Shale of Cuyahoga Group (OH*,PA*)
["Submember" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Aurora submember considered informal and should not be capitalized.]
Early Mississippian (Tournaisian; Kinderhookian)*
Named from exposures on Aurora Creek in northwest part of Portage Co., northeastern OH (Prosser, 1912).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).