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National Geologic Map Database

Geologic Unit: Rochester

Usage:

Rochester Shale of Clinton Group (MD*,NY*,PA*,WV)
Rochester Shale (MD,OH,WV*)
Rochester Shale Member of Clinton Formation (MI*)
Rochester Member of McKenzie Formation (WV)
Rochester Member of Mifflintown Formation (PA)


Subunits:

FORMATION STATUS (alphabetical) --all in NY: Burleigh Hill Member*, Gates Member, Glenmark Member, Lewiston Member*.


Geologic age:

late Early Silurian (Wenlock)*


Type section, locality, area and/or origin of name:

Type area: exposures at Rochester, Monroe Co., west-central NY (Hall, 1839).


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 ([ ]).