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National Geologic Map Database

Geologic Unit: Medina

Usage:

Medina Group (NY*,OH,PA,WV)


Subunits:

(alphabetical) --all in NY: Balls Falls Formation, Cambria Shale*, Devils Hole Sandstone*, Grimsby Formation*, Jolley Cut Formation, Kodak Sandstone*, Power Glen Shale*, Thorold Sandstone*, Whirlpool Sandstone*.


Geologic age:

early Early Silurian (Llandovery)*


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

Named from exposures in vicinity of Medina, Orleans Co., NY (US geologic names lexicon, USGS Bull. 1200).


AAPG geologic province:

Appalachian basin*


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 ([ ]).