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Geologic Unit: Grant
Map showing publication footprint
  • Usage in publication:
    • Grant shale member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Limestone
  • AAPG geologic province:
    • Nemaha anticline
    • Sedgwick basin
Publication:

Condra, G.E., and Upp, J.E., 1931, Correlation of the Big Blue series in Nebraska: Nebraska Geological Survey Bulletin, 2nd series, no. 6, 74 p., See also "Modern classifications of the Permian rocks of Kansas and Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, 1 sheet


Summary:

Pg. 50. Grant shale. Middle member of Winfield formation of Chase group. Consists of bluish gray, argillaceous shale with thin seams of fossiliferous limestone near top in most sections. Thickness 15 or 16 feet in Nebraska and in northern central Kansas, but decreases southward toward Winfield and plays out between there and Arkansas City, Kansas. In many exposures it carries a thin pebbly subzone near top. Overlies Stovall limestone member and underlies Cresswell limestone member. Fossils. Age is Permian (Big Blue).
Type locality: between 5 and 6 mi north of Florence, Marion Co., eastern KS. Named from Grant Twp., Marion Co., eastern KS.

Source: US geologic names lexicon (USGS Bull. 896, p. 856); GNC KS-NE Permian Corr. Chart, Oct. 1936; supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Grant shale member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Nemaha anticline
    • Sedgwick basin
Publication:

Moore, R.C., Frye, J.C., Jewett, J.M., Lee, Wallace, and O'Connor, H.G., 1951, The Kansas rock column: Kansas Geological Survey Bulletin, no. 89, 132 p.


Summary:

Pg. 44. Grant shale member of Winfield limestone. Consists of gray calcareous fossiliferous shale; a distinct unit except in southern Kansas where it probably has been included in lower part of Cresswell limestone member. Thickness in northern part about 10 to 12 feet; in central part about 6 feet. Overlies Stovall limestone member. Age is Early Permian (Wolfcamp).

Source: US geologic names lexicon (USGS Bull. 1200, p. 1575).


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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