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).]
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).
Not designated. Named from fact that it includes graphite coal beds of Rhode Island (Emerson, 1917).
New England province*
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 ([ ]).