Usage:
Davis Formation (IL*,IN*,MN*,MO*)
Davis Formation of Elvins Group (MO)
Davis Formation of Munising Group of Potsdam Supergroup (IN)
Davis Formation of Tunnel City Group (MN)
Davis Formation of Knox Group (IL-notably in southern part)
Davis Shale Member of Franconia Formation (IL*-notably in northern part)
Davis member (informal) of Franconia Formation (MN)
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Late Cambrian (Croixan; Millardan; Steptoean)*
Type section, locality, area and/or origin of name:
Named from outcrops on Davis Creek, St. Francois Co., southeastern MO (Buehler, 1907).
AAPG geologic province:
Illinois basin*
Ozark uplift*
Upper Mississippi embayment
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 ([ ]).