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NGMDB

Geologic Unit: Rhode Island

Usage:

Rhode Island Formation (RI*,MA*)
/Rhode Island Group (RI,MA)

[An identical geographic name may not be applied to a unit [Rhode Island Group] and its parts [Rhode Island Formation] (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005).]


Subunits:

Sachuest Arkose (RI), Purgatory Conglomerate (RI), Pondville Conglomerate (MA,RI), Wamsutta Formation (MA,RI), Rhode Island Formation (RI,MA), and Dighton Conglomerate (MA,RI) of Rhode Island Group (Skehan and Rast, 1990).


Geologic age:

Pennsylvanian, Early
Pennsylvanian, Middle*
Pennsylvanian, Late*


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

Not designated. Named from fact that it includes graphite coal beds of Rhode Island (Emerson, 1917).


AAPG geologic province:

New England province*


NGMDB

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 ([ ]).

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Page Last Modified: Tue Jun 3 16:26:31 2014