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 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 ([ ]).