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 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 ([ ]).