U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Gorman
Search archives
Map showing publication footprint
  • Usage in publication:
    • Gorman Formation*
  • Modifications:
    • First used
  • Dominant lithology:
    • Limestone
    • Dolomite
Publication:

Barnes, V.E., and Cloud, P.E., Jr., 1945, Representative sections of the Ellenburger group in central Texas: University of Texas-Austin, Bureau of Economic Geology Mineral Resources Circular, no. 34, 44 p.


Summary:

Pg. 1, 8-19. Gorman formation. Limestone and dolomite. Thickness 426 feet. Overlies Tanyard formation (new); underlies Honeycut formation (new). Cherokee Creek section, San Saba County, central Texas, described. Age is Early Ordovician.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1550).


Map showing publication footprint
  • Usage in publication:
    • Gorman formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
    • Dolomite
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:

Proposed that name Gorman formation be used to designate rocks similar to and correlative with those in the composite type section (herein designated). Basal zone characterized by varicolored and very fine-grained dolomites --yellows, pinks, browns; upper calcitic facies consists principally of sublithographic, thickly to thinly bedded limestone with locally interbedded microgranular to fine-grained dolomite; a sequence of pure, unusually thick-bedded limestone present in top 40 to 60 feet of formation. Dolomitic facies 81 to 230 feet thick; calcitic facies 237 to 393 feet. Chert common. Where not thinned by post-Ellenburger truncation, between 426 and 498 feet thick.
Type section: vicinity of Gorman Falls, along and near gorge of the Colorado River, San Saba Co., TX.
[Type section described in detail in Cloud and Barnes, 1948 [1946] (Univ. Texas Bur. Econ. Geol. Pub., no. 4621, p. 9-10, 39-40, 137-138, 158-159, 195-197, 227-229, 235-239, pls. 9, 35).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1550).


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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:57:58 PM MDT