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Geologic Unit: Butler
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Map showing publication footprint
  • Usage in publication:
    • Butler clay member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Clay
  • AAPG geologic province:
    • Gulf Coast basin
Publication:

Plummer, F.B., 1933, The Cenozoic systems in Texas, Part 3, IN Sellards, E.H., Adkins, W.S., and Plummer, F.B, The geology of Texas; Volume 1, Stratigraphy: University of Texas Bulletin, no. 3232, p. 519-818., Published July, 1933


Summary:

Pg. 530, 587, etc. Butler clay member of Rockdale formation. Basal member of Rockdale formation in central and southern Texas [between Brazos and Frio Rivers]. Consists of (a) gray and buff, lenticular, fine-grained, thin-bedded sand containing indurated and laminated rough-surfaced concretions; (b) micaceous clays, in most places rather free of sand, tough and massive, in other places silty and laminated and characterized by limonitic partings; (c) seams and lentils of lignite. Thickness 400 feet. Underlies Simsboro sand member of Rockdale formation and overlies Seguin formation. Age is early Eocene.
Typically exposed at town of Butler, [Elgin East 7.5-min quadrangle, Bastrop Co., central TX].
[Additional locality information from USGS historical topographic map collection TopoView, accessed April 11, 2013.]

Source: US geologic names lexicon (USGS Bull. 896, p. 304-305).


Map showing publication footprint
  • Usage in publication:
    • Butler clay member
  • Modifications:
    • Revised
  • Dominant lithology:
    • Clay
  • AAPG geologic province:
    • Gulf Coast basin
Publication:

Stenzel, H.B., 1953, AAPG field trip no. 5 to Austin [Texas], IN Guidebook, field trip routes, oil fields, geology: American Association of Petroleum Geologists Field Trip Guidebook, Joint annual meeting of American Association of Petroleum Geologists, Society of Economic Paleontologists and Mineralogists, and Society of Exploration Geophysicists, Houston, TX, March, 1953, p. 43-60.


Summary:

Pg. 52-54. Butler clay member of Calvert Bluff formation of Wilcox Group. Reallocated to member status in Calvert Bluff formation. Forms basal part of formation, but top boundary indistinguishable from remainder of Calvert Bluff. Overlies Simsboro formation. Age is early Eocene.
[p. 53 (pl. 1). Stop 6, Brick Companies around Butler, Elgin East 7.5-min quadrangle, Bastrop Co., central TX.]

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 555-556).


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 ([ ]).

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