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  • Usage in publication:
    • Bullfrog Mountain Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Slate
    • Conglomerate
  • AAPG geologic province:
    • Okanogan province
Publication:

Rinehart, C.D., and Fox, K.F., Jr., 1972, Geology and mineral deposits of the Loomis quadrangle, Okanogan County, Washington: Washington Division of Mines and Geology Bulletin, no. 64, 124 p., (incl. geologic map, scale 1:62,500)


Summary:

Named for Bullfrog Mountain northeast of Palmer Lake, central Loomis 15' quad, Okanogan Co, WA, which is designated as type locality. Is upper unit of Anarchist Group. Composed of interbedded slate, metasiltstone, metagraywacke, and sharpstone metaconglomerate. Is about 5,000 ft thick at type but thins abruptly to north-east and thickens to southwest. Conformably overlies Spectacle Formation (new) of Anarchist Group. Unconformably underlies Palmer Mountain Greenstone (new) or Kobau Formation (new). Is considered Late(?) Permian age based on gradational contact with Spectacle Formation and general lithologic similarity.

Source: GNU records (USGS DDS-6; Menlo 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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