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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Staendebach member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Dolomite
  • AAPG geologic province:
    • Llano uplift
Publication:

Cloud, P.E., Jr., Barnes, V.E., and Bridge, Josiah, 1946, Stratigraphy of the Ellenburger group in central Texas; a progress report, IN E.H. Sellards, [ed.], Texas Mineral resources: University of Texas-Austin, Bureau of Economic Geology Publication, no. 4301, p. 133-161., [1945]


Summary:

Named as the upper member of the Tanyard formation (new) of the Ellenburger group (rank raised). Name derived from the Staendebach Survey, a part of the T. H. Young ranch which includes of the type section, southern San Saba Co., TX on the Llano uplift. Shown on geologic map of parts of Blanco Co. Cross section Overlies Threadgill member (first published description) of Tanyard formation. Underlies Gorman formation (named) of Ellenburger. Consists of limestone in northeast part of Llano uplift, but dolomite predominates over limestone in southeast and west part of uplift. Contains some chert that weathers to shiny white masses, slabs or chips. Aggregated small stromatolitic bodies resembling warm castings present in upper part. Locally, upper two-thirds has zones of oolitic to oomoldic, laminar chert with parallel bands. Of Early Ordovician age.

Source: 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 ([ ]).