U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Roca
Search archives
Map showing publication footprint
  • Usage in publication:
    • Roca shale bed
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Salina basin
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. Roca shale bed of Elmdale shale member of Wabaunsee formation. Bluish-gray, olive-green, and reddish argillaceous shale; thin seams of fossiliferous limestone in upper part. Thickens 18 to 20 feet in southeastern Nebraska, 20 to 44 feet in northeastern Kansas. Top bed of Elmdale shale member. Overlies Howe limestone member and underlies Neva limestone. Age is Late Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.
Named from Roca, Lancaster Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 1823); 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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 04:07:50 PM MDT