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Geologic Unit: McNairy

McNairy Formation (IL,MO,TN,KY*)
McNairy Sand Member of Ripley Formation (MS*)
McNairy Sand (IL*,KY*,MO*,TN*)

Cretaceous, Late*

Geologic Province:
Upper Mississippi embayment*
Illinois basin*

Areal Extent:

Type Locality:
Cut on the Southern RR, 1.5 mi west of Cypress Station, McNairy Co., TN (Stephenson, 1914).

Levings Member (IL). Zadoc Member (MO).

Unit Name History:
Named (Stephenson, 1914).
Revised (Wade, 1917; 1926).
Overview; Areal limits (Wilmarth, 1938).
Revised (Leighton and others, 1939).
Revised in IL (Weller, 1940).
MS Geol. Survey usage (Belt, 1945).
Revised in MO and IL (Stephenson, 1955).
Usage in MO (Grohskopf, 1955).
Revised in IL (Pryor and Ross, 1962).
Revised in western TN (Parks and Russell, 1975).
Usage in southern IL (Kolata and others, 1981).
Overview (Harrison, 1999).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Database project personnel
Last modified: 15-Jan-2013