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National Geologic Map Database

Geologic Unit: Markley

Usage:

Markley Formation of Bowie Group (TX)


Subunits:

(alphabetical) --in TX: Breckenridge Limestone Member, Crystal Falls Limestone Member.


Geologic age:

Pennsylvanian, Late
Virgilian
Permian, Early
Wolfcampian


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

Stratotype: from base of road cut on north side of Farm Road 1769 about 2.7 mi west of Farm Road 1769's intersection with TX Highway 16 at Markley in northeastern Young Co., TX. Named from Markley (Hentz, 1988).


AAPG geologic province:

Bend arch
Fort Worth syncline


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 ([ ]).