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Geologic Unit: Rock Bluff
Map showing publication footprint
  • Usage in publication:
    • Rock Bluff limestone bed
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Nemaha anticline
Publication:

Condra, G.E., 1927, The stratigraphy of the Pennsylvanian system in Nebraska: Nebraska Geological Survey Bulletin, 2nd series, no. 1, 291 p., See also "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 1


Summary:

Pg. 40, 43, 50. Rock Bluff limestone bed of Deer Creek limestone member of Shawnee formation. Basal bed of Deer Creek limestone, 8 inches to 2.5 feet thick in southeastern Nebraska, and thickens somewhat southward to northwest Missouri (5+ feet) and northeastern Kansas (6 feet). (Also occurs in southwestern Iowa.) Underlies Larsh shale and overlies Tecumseh shale. Age is Late Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.
Named from exposures high in the Missouri River bluffs northeast of Rock Bluff, Cass Co., southeastern NE.
[This definition was followed by Condra and R.C. Moore in several charts up to and including Oct. 1932.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1826); GNC KS-NE Pennsylvanian Corr. Chart, sheet 1, Oct. 1936; supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Rock Bluff limestone bed
  • Modifications:
    • Contact revised
  • AAPG geologic province:
    • Nemaha anticline
Publication:

Condra, G.E., 1930, Correlation of the Pennsylvanian beds in the Platte and Jones Point sections of Nebraska: Nebraska Geological Survey Bulletin, 2nd series, no. 3, 57 p., See also "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 1


Summary:

Rock Bluff limestone bed of Deer Creek limestone member of Shawnee group. Gray, massive, dense limestone 2 feet 5 inches thick. In southeastern Nebraska overlies Rakes Creek limestone bed of Tecumseh shale member [lower Deer Creek limestone beds are absent in Nebraska, R.C. Moore]. Underlies Larsh shale bed of Deer Creek. Age is Pennsylvanian.

Source: GNC KS-NE Pennsylvanian Corr. Chart, sheet 1, Oct. 1936; supplemental information 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 ([ ]).

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