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National Geologic Map Database

Geologic Unit: Davis

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).