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Geologic Unit: Swede Gulch
Map showing publication footprint
  • Usage in publication:
    • Swede Gulch Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Graywacke
    • Slate
    • Schist
    • Chert
  • AAPG geologic province:
    • Midcontinent region
Publication:

Bayley, R.W., 1972, A preliminary report on the geology and gold deposits of the Rochford district, Black Hills, South Dakota, IN Contributions to economic geology: U.S. Geological Survey Bulletin, 1332-A, p. A1-A24, (incl. geologic map, scale 1:24,000) [http://ngmdb.usgs.gov/Prodesc/proddesc_21440.htm]


Summary:

Named for "typical exposures" along Swede Gulch, secs 31, 32, and 33, T3N, R3E, Lawrence Co, SD in the Midcontinent region. Type locality not specifically stated. Composed of graywacke, slate, graphitic schist, and massive chert. Very generalized description of lithology. Areal extent beyond report boundaries not discussed. No thickness given. Overlies Poverty Gulch Slate (new). Correlated with Grizzly Formation of Lead area. Is the youngest middle Precambrian formation in the area. Geologic map.

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


Map showing publication footprint
  • Usage in publication:
    • Swede Gulch 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 Early Proterozoic unit Xsh (Pl. 1) west of Nahant, Lawrence Co, SD, and in the Rochford area, Custer Co, SD, both 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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