Usage:
Sappa Formation (IA,KS,NE*,SD)
Sappa Member of Sheridan Formation (NE)
Subunits:
FORMATION STATUS (alphabetical): Grand Island Member (NE), [†?]Pearlette Ash Member (KS,NE,SD).
MEMBER STATUS: [†?]Pearlette Ash Bed (NE).
Geologic age:
Quaternary*
Pleistocene*
Type section, locality, area and/or origin of name:
Not synopsized to date.
AAPG geologic province:
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 ([ ]).