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Geologic Unit: Bugtown
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Map showing publication footprint
  • Usage in publication:
    • Bugtown formation*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Schist
  • AAPG geologic province:
    • Powder River basin
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:

Pg. 203, 204-207, pl. 21. Bugtown Formation. Oldest of metamorphic rocks in Fourmile quadrangle, Custer Co., southwestern South Dakota. Consists predominantly of quartz-mica schist, derived from graywacke and impure sandstone. Exposed thickness about 1,500 feet; estimated thickness 4,000 feet. Lower contact not exposed within limits of quadrangle; contact tentatively placed between massive quartz-mica schist typical of the Bugtown and an unnamed garnetiferous schist that lies to northeast. Underlies Crow formation (new). Age is Precambrian.
Named from Bugtown Gulch, [in secs. 12, 13, T. 3 S., R. 3 E.], Berne quadrangle, Custer Co., southwestern SD, which adjoins Fourmile quadrangle on north. Bugtown Gulch crosses well-exposed section of formation.

Source: US geologic names lexicon (USGS Bull. 1350, p. 100).


Map showing publication footprint
  • Usage in publication:
    • Bugtown Formation*
  • Modifications:
    • Revised
  • Dominant lithology:
    • Schist
    • Iron-formation
  • AAPG geologic province:
    • Midcontinent region
Publication:

Redden, J.A., 1968, Geology of the Berne quadrangle, Black Hills, South Dakota, IN Pegmatites and other Precambrian rocks in the southern Black Hills: U.S. Geological Survey Professional Paper, 297-F, p. F343-F408.


Summary:

Originally (Redden, 1963, USGS PP 297-D) lower contact placed where massive quartz-mica-feldspar schists of Bugtown are in contact with unnamed garnetiferous schists. Is redefined [revised] to include the garnetiferous schists and quartz-mica-feldspar schists and other rock types. The Bugtown-Loues (new name applied in this chapter) contact placed at first appearance of massive quartz-mica-feldspar schists above dominantly thin-bedded micaceous schists of Loues. Type section of revised Precambrian Bugtown is along North Georgetown Gulch and northeastward to Atlantic Hill, SD, in Midcontinent region. Underlies Crow Formation.

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


Map showing publication footprint
  • Usage in publication:
    • Bugtown Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Powder River basin
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 as part Early Proterozoic unit Xgw (Pl. 1) west of the Grand Junction fault, Berne quad, Custer Co, SD in the Midcontinent region. Geologic map.

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


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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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