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  • Usage in publication:
    • Mt. Royal granodiorite
  • Modifications:
    • First used
  • AAPG geologic province:
    • Montana folded belt
Publication:

Mutch, T.A., 1961, Geologic map of the northeast flank of the Flint Creek Range, western Montana: Montana Bureau of Mines and Geology Geologic Map, no. 5, 1 sheet, scale 1:63,360, Also issued as Montana Bur. Mines Geol. Spec. Pub., no. 22. See also Princeton Univ. unpub. PhD dissert., 1960, and Dissert. Abs., v. 21, no. 8, p. 2250, 1961 (Feb.)


Summary:

First published use as a map unit. Shown on geologic map and map explanation. Intent to name, type locality, description, areal limits, etc not given. Report is in Granite and Powell Cos, MT in the Montana folded belt province. Of Tertiary? age. [Should not be considered a formal name]

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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