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National Geologic Map Database

Geologic Unit: Lewiston

Usage:

Lewiston Member of Rochester Shale of Clinton Group (NY*)


Geologic age:

late Early Silurian (Wenlock)*


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

Cliff exposures in the east wall of Niagara Gorge, 1 km (0.6 mi) south of the Lewiston-Queenston bridge and 0.6 km (0.4 mi) north of the Robert Moses power plant, 2.3 km (1.4 mi) south of Lewiston, Lewiston 7.5-min quadrangle, Niagara Co., NY (Brett, 1983).


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 ([ ]).