- Usage in publication:
-
- Welge sandstone member*
- Modifications:
-
- Named
- Dominant lithology:
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- Sandstone
- AAPG geologic province:
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- Llano uplift
Summary:
Name proposed for the basal member of the Wilberns formation. Is 27 feet thick at type; averages 18 feet thick; ranges between 9 and 35 feet thick. Is recognized throughout the Llano uplift. Consists of brown, nonglauconitic sandstone. Overlies Lion Mountain sandstone member, upper member of Riley Formation. Underlies Maroon Creek limestone member (new), one of five members of Wilberns formation; contact is gradational. Age is Late Cambrian. Report includes cross sections.
Best exposure (or type section) is along Squaw Creek, approx. 0.5 mi north of Gillespie Co. line. Named from Welge land survey between Threadgill and Squaw Creeks, Gillespie Co., TX, on the Llano uplift.
[NOTE: The Department of the Interior's Secretarial Order 3404, issued on November 19, 2021, formally identifies the term “squaw” as derogatory. That Order will create a federal Derogatory Geographic Names Task Force, to find replacement names for geographic features in use by federal agencies. We’re awaiting guidance from the Task Force, and will then take the appropriate actions.]
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).