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National Geologic Map Database

Geologic Unit: Blanco

Usage:

Blanco Formation (KS,NM?,TX*)
Originally called Blanco Canyon Beds.


Subunits:

(alphabetical) --all in KS: Fullerton Member, Holdredge Member.


Geologic age:

late Tertiary to Quaternary (late Pliocene to early Pleistocene; Blancan to Irvingtonian NALMA)*
Due to change in Plio-Pleistocene boundary, age may now be considered all or in part Pleistocene.


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

Named from Blanco Canyon in Dickens Co., and Mount Blanco Post Office in Crosby Co., panhandle of TX (US geologic names lexicons, USGS Bull. 896, 1200).
[Type locality stated to be north center SW/4 sec. 1, Blk. 3, Eastland County School Land, Crosby Co., panhandle of TX (see Boerllstorff, 1976).]
[Typical exposures: Bridwell Ranch, along Crawfish Creek, south-southwest of intersection of U.S. Highway 193 and 651, approx. Lat. 33 deg. 46 min. 00 sec. N., Long. 101 deg. 15 min. 30 sec. W., Floydada SE 7.5-min quadrangle, Blanco Canyon, Crosby Co., panhandle of TX (see Evans and Meade, 1945; Frye and Leonard, 1952).]


AAPG geologic province:

Anadarko basin
Central Kansas uplift
Permian basin*
Sedgwick 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 ([ ]).