Usage:
Purgatory Conglomerate of Narragansett Bay Group (RI*)
Purgatory Conglomerate of /Rhode Island Group (RI)
[An identical geographic name may not be applied to a stratigraphic unit [Rhode Island Group] and its parts [Rhode Island Formation] (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Geologic age:
Pennsylvanian*
Type section, locality, area and/or origin of name:
Typically developed at Purgatory Rocks, Newport, RI (Foerste, 1899).
AAPG geologic province:
New England province*
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 ([ ]).