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National Geologic Map Database

Geologic Unit: Cobourg

Usage:

Cobourg Limestone (NY*)
Cobourg Limestone of Trenton Group (NY*)
Cobourg Formation of Trenton Group (NY?,Canada)


Subunits:

(alphabetical) --all in Canada and NY?: Hallowell Limestone Member, Hillier Member, Steuben Limestone Member.


Geologic age:

Late Ordovician (Cincinnatian; Edenian)*


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

Cobourg, Northumberland Co., Ontario, Canada (Raymond, 1921).


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 ([ ]).