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Geologic Unit: Johnson
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Map showing publication footprint
  • Usage in publication:
    • Johnson 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. 84, 86, 88. Johnson shale bed of Elmdale shale member of Wabaunsee formation. Bluish argillaceous shale modified by thin grayish sandy layers, calcareous plates, some gypsiferous material and geodes. Thickness 16 to 25 feet in Nebraska and 16 to 20 feet in northeastern Kansas. Underlies Glenrock limestone and overlies Long Creek limestone. Age is Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.
Named from exposures 1.5 mi north of Johnson, Johnson Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 1049); 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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