Usage:
Grand Island Formation (CO*,IA*,KS*,NE*,SD*)
Grand Island Member of Sheridan Formation (IA,NE)
Grand Island Member of Meade Formation (KS)
Grand Island Member of Sappa Formation (NE)
Geologic age:
Quaternary (Pleistocene)*
Type section, locality, area and/or origin of name:
Named from exposures at and around Grand Island, Hall Co., southeastern NE (Lugn and Condra, 1932).
AAPG geologic province:
Anadarko basin*
Chadron arch*
Denver basin*
Iowa shelf*
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 ([ ]).