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National Geologic Map Database

Geologic Unit: Rockland

Usage:

Rockland Formation (NY)
Rockland Limestone of Trenton Group (NY)


Subunits:

(alphabetical) --all in NY: Napanee Member, Selby Member.


Geologic age:

Middle Ordovician


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

Rockland, Ontario, Canada, 30 mi east of Ottawa, Canada (Kay, 1933).


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 ([ ]).