U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Blue Draw
Map showing publication footprint
  • Usage in publication:
    • Blue Draw Metagabbro
  • 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:

Is a 3,000 ft thick, layered, gravity-differentiated, and metamorphosed sill that intrudes Early Proterozoic Boxelder Creek Formation in the Nemo area, Lawrence Co SD in the Midcontinent region. Is unconformably overlain by Early Proterozoic Estes Formation. Assigned to Early Proterozoic. Preliminary U-Th-Pb zircon yield date of 2.2 Ga on the formation. Mapped with gabbro units on geologic map.

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


Map showing publication footprint
  • Usage in publication:
    • Blue Draw Metagabbro*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Midcontinent region
Publication:

Redden, J.A., Peterman, Z.E., Zartman, R.E., and DeWitt, Ed, 1990, U-Th-Pb geochronology and preliminary interpretation of Precambrian tectonic events in the Black Hills, South Dakota, IN Lewry, J.F., and Stauffer, M.R., eds., The early Proterozoic Trans-Hudson Orogen of North America: Geological Association of Canada Special Paper, 37, p. 229-251.


Summary:

(advance copy). U-Pb age of 2,170 +/-120 Ma (Early Proterozoic) determined on zircon. Unit occurs in Nemo area of Black Hills (Midcontinent region).

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 03:51:08 PM MDT