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Geologic Unit: Crow
Map showing publication footprint
  • Usage in publication:
    • Crow formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Schist
    • Gneiss
    • Quartzite
  • AAPG geologic province:
    • Midcontinent region
Publication:

Redden, J.A., 1963, Geology and pegmatites of the Fourmile quadrangle, Black Hills, South Dakota, IN Pegmatites and other Precambrian rocks in the southern Black Hills: U.S. Geological Survey Professional Paper, 297-D, p. D199-D291.


Summary:

Named for Crow Creek in Berne quad, Custer Co, SD. Type section is at NW1/4 sec 30, T3S, R4E in Berne quad; extends north into Pennington Co, SD, both in the Midcontinent region. Consists of amphibolite schist, calcite-hornblende gneiss, calsilicate gneiss, cordierite-biotite and microcline-biotite schist, quartzite, and thin beds of quartz-mica-feldspar schist scattered through the formation. Is 152 ft thick at type section where it lies between Bugtown formation below (a new name), and Mayo formation above (a new name). Composition of rocks suggests they were mainly dolomite, shale, chert, and perhaps volcanic rocks. Assigned a Precambrian age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Crow Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Midcontinent region
Publication:

DeWitt, Ed, Redden, J.A., Wilson, A.E., and Buscher, David, 1986, Mineral resource potential and geology of the Black Hills National Forest, South Dakota and Wyoming, with a section on salable commodities by J.S. Dersch: U.S. Geological Survey Bulletin, 1580, 135 p., (incl. geologic map, scale 1:250,000)


Summary:

Mapped with metabasalts (units Xb, Pl. 1) of Early Proterozoic age in the Custer area, SD in the Midcontinent region. Geologic map.

Source: 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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