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National Geologic Map Database

Geologic Unit: Tillman

Usage:

/Tillman Metasedimentary Group (OK-subsurface)

[A group name combines a geographic name with the term "group," and no lithic designation is included (ACSN, 1961, 1970; NACSN, 1983, 2005). A "group" consists of 2 or more formations (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005).]


Subunits:

Meers Quartzite (OK).


Geologic age:

Proterozoic, Middle
Precambrian, late
or
Cambrian, Early


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

Not designated. Named from Tillman Co., OK, where has been penetrated in subsurface by numerous wells (Ham and others, 1964).


AAPG geologic province:

South Oklahoma folded belt
Palo Duro basin


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 ([ ]).