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National Geologic Map Database

Geologic Unit: Everton

Usage:

Everton Formation (AR*,IL*,MO*)
Everton Dolomite (IN,TN)
Everton Dolomite of Knox Group (IL*-notably in southern part)
Everton Dolomite of Knox Supergroup (IN-subsurface)


Subunits:

(alphabetical) --all in AR*: Calico Rock Sandstone Member, Jasper Member, Kings River Sandstone Member, Newton Sandstone Member, Sneeds Limestone Lentil.


Geologic age:

Middle Ordovician (Whiterockian)*


Type section, locality, area and/or origin of name:

Named from Everton, Boone Co., AR (Purdue, 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 ([ ]).