U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Rapid Creek Greenstone*
  • Modifications:
    • Named
    • Reference
  • Dominant lithology:
    • Greenstone
    • Basalt
    • Tuff
    • Agglomerate
  • 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 as a middle formation of Flag Rock Group (rank raised) for exposures east of Rapid Creek in sec 15, T2N, R3E, Pennington Co, SD in the Midcontinent region, which are designated the type locality. Reference locality designated in secs 23 and 24, T2N, R3E. Composed of volcanic rocks that are entirely mafic, probably basaltic. Is a greenstone pillow lava. Occurs on west limb of Rochford anticline and in minor refolded anticlines south of Rochford. Described on map explanation (geologic map) as an ellipsoidal metabasalt, nonellipsoidal metabasalt, schistose calcareous mafic tuff and agglomerate. No thickness given. Very generalized description of lithology. Areal extent beyond report boundaries not discussed. Formerly mapped as unnamed part of Flag Rock Formation. Overlies Montana Mine Formation (new) of Flag Rock. Intertongued with Nahant Schist (new) of Flag Rock. Underlies Rochford Formation (new) of Flag Rock. Of middle Precambrian age.

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


Map showing publication footprint
  • Usage in publication:
    • Rapid Creek Greenstone*
  • Modifications:
    • Age modified
    • Overview
  • 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 Xb (Pl. 1) in the Rochford area, Pennington Co, SD in the Midcontinent region. Is probably younger than the Hay Creek Greenstone in the Nemo area, equivalent to the Flag Rock Formation, and thus younger than about 2.0 Ga. 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 ([ ]).

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 04:07:09 PM MDT