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Map showing publication footprint
  • Usage in publication:
    • Rock Lake shale bed
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
  • 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. 41, 59, 156, 157. Rock Lake shale bed of Scranton shale member of Shawnee formation. Basal 6 feet of Scranton shale. Upper 1 to 2 feet bluish; rest maroon; all argillaceous. Underlies South Bend limestone and overlies Howard limestone. Age is Late Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.
Named from outcrop at Rock Lake, in sec. 3, T. 12 N., R. 10 E., Sarpy Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 1830); 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 Lake shale bed
  • Modifications:
    • 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:

Pg. 11, 13, 26, 27, 31, 32, 33, 34, 36. The Rock Lake shale and overlying South Bend limestone belong in top of Stanton limestone. The Rock Lake shale consists of shale and one thin limestone at top. Rests on Stoner limestone, also included in Stanton limestone. Described from measured sections along Platte River, Cass Co., southeastern Nebraska. Has been traced into Missouri and Kansas. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 896, p. 1830); 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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