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, 2021). A "group" consists of 2 or more formations (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
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 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 ([ ]).