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Geologic Unit: Cass
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Map showing publication footprint
  • Usage in publication:
    • Cass 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. 41, 58. Cass limestone bed of Scranton shale member of Shawnee formation. Is 12 feet thick, overlies Plattford shale and lies 13+/- feet below White Cloud shale, all in Scranton shale. Age is Late Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.
Named from exposures along Platte River northwest of South Bend, Cass Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 363); 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:
    • Cass limestone†
  • Modifications:
    • Abandoned
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. †Cass limestone. Is abandoned, as another name [what?] has priority.

Source: US geologic names lexicon (USGS Bull. 896, p. 363); GNC KS-NE Pennsylvanian Corr. Chart, sheet 1, Oct. 1936.


Map showing publication footprint
  • Usage in publication:
    • Cass limestone†
  • Modifications:
    • Abandoned
Publication:

Moore, R.C., 1936, Stratigraphic classification of the Pennsylvanian rocks of Kansas: Kansas Geological Survey Bulletin, no. 22, 256 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 2


Summary:

Pg. 210. States †Cass limestone is abandoned. Does not belong in Scranton shale. [Did not explain where it does belong.]

Source: US geologic names lexicon (USGS Bull. 896, p. 363); GNC KS-NE Pennsylvanian Corr. Chart, sheet 2, Oct. 1936.


Map showing publication footprint
  • Usage in publication:
    • Cass limestone
  • Modifications:
    • Overview
Publication:

Wilmarth, M.G., 1936, [Selected Geologic Names Committee remarks (ca. 1935-1938) on Carboniferous and Permian rocks of the Midcontinent], IN Wilmarth, M.G., 1938, Lexicon of geologic names of the United States (including Alaska): U.S. Geological Survey Bulletin, 896, pts. 1-2, 2396 p.


Summary:

E.C. Reed (Asst. State Geol. Nebraska), 1936 (letter dated Oct. 16) states Cass limestone is still being used in Nebraska. It is not yet definitely known which bed in Kansas and Missouri is its equivalent, and until this is decided Cass will be used. We believe it may be = Amazonia or Haskell limestone.
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, 2 sheets.

Source: US geologic names lexicon (USGS Bull. 896, p. 363).


Map showing publication footprint
  • Usage in publication:
    • Cass limestone
  • Modifications:
    • Revised
Publication:

Condra, G.E., 1949, The nomenclature, type localities, and correlation of the Pennsylvanian subdivisions in eastern Nebraska and adjacent states: Nebraska Geological Survey Bulletin, no. 16, 67 p.


Summary:

Pg. 29-30. Cass limestone of Douglas group. When named in 1927, exact age relation of the Cass was not known, but since that time it has been found that this subdivision is cyclothemal formation composed of 3 members (ascending): Shoemaker formation (redefined), Little Pawnee shale (new), and Haskell limestone. Thickness 17 feet or more. Underlies Robbins shale; overlies Plattford formation. Age is Late Pennsylvanian (Virgilian).

Source: US geologic names lexicon (USGS Bull. 1200, p. 660-661).


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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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