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National Geologic Map Database

Geologic Unit: Thorold

Usage:

Thorold Sandstone of Albion Group (NY)
Thorold Sandstone of Medina Group (NY*,PA)


Geologic age:

early Silurian (Llandovery)*


Type section, locality, area and/or origin of name: (See Canadian Lexicon)

Exposures on Welland Canal, at Thorold, Ontario, Canada (Grabau, 1913).


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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).