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National Geologic Map Database
Geologic Unit: Utopia
Map showing publication footprint
  • Usage in publication:
    • Utopia metadiorite
  • Modifications:
    • Named
  • Dominant lithology:
    • Diorite
  • AAPG geologic province:
    • Northern Rocky Mountain region
Publication:

Houston, R.S., 1968, A regional study of rocks of Precambrian age in that part of Medicine Bow Mountains lying in southeastern Wyoming, with a chapter on the relationship between Precambrian and Laramide structure: Geological Survey of Wyoming Memoir, no. 1, 167 p.


Summary:

Name applied as an informal descriptive term to a lenticular conformable metadiorite body in sec 4, T15N, R78W, northwest of the Utopia mine, Albany Co, WY in Northern Rocky Mountain region. Geologic map. Neither source of geographic name nor location of type locality stated. The plagioclase is saussuritized. Was probably originally a diorite with recrystallized plagioclase. Is one of several mafic intrusions of Precambrian age common south of the Mullen Creek-Nash Fork shear zone that extend along strike for 10 ft to 1/2 mi or more.

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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