No current usage.
(†Sheridan Sandstone (ME-local), or †Sheridan Formation (ME-local), replaced with Frenchville Formation. See Frenchville.)
Silurian
Named from exposures on Sheridan plantation, south of Aroostook River, Aroostook Co., northeastern ME (Williams, 1900).
Salina 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 ([ ]).