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National Geologic Map Database
Geologic Unit: Picabo
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Map showing publication footprint
  • Usage in publication:
    • Picabo Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Dolomite
    • Conglomerate
  • AAPG geologic province:
    • Snake River basin
Publication:

Skipp, Betty, and Sandberg, C.A., 1975, Silurian and Devonian miogeosynclinal and transitional rocks of the Fish Creek Reservoir window, central Idaho: U.S. Geological Survey Journal of Research, v. 3, no. 6, p. 691-706.


Summary:

Named for the town of Picabo about 15 mi southwest of the Fish Creek Reservoir, Blaine Co, ID in the Snake River basin. Type section measured in NE1/4 sec 10, T1N, R22E where Picabo overlies Jefferson Formation and underlies Copper Basin Formation. Lower contact is covered; upper contact is a thrust fault. Is 189+ ft thick at type where it consists of: 1) lower gray, fine-grained, laminated, quartzitic sandstone interbedded with laminated sandy gray dolomite; 2) middle interbedded dolomite conglomerate and dolomitic sandstone; and 3) upper gray to red, very fine to fine-grained, thin-bedded, calcareous sandstone. The conglomerate is gray to yellow brown, of well-rounded to tabular pebbles with diameters as large as 5 in, derived from underlying Jefferson or from Carey Dolomite (new). Is nonfossiliferous. Presumed to be very late Devonian because of stratigraphic position. Geologic map, columnar section. Is a shelf-facies rock.

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


Map showing publication footprint
  • Usage in publication:
    • Picabo Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Idaho Mountains province

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 ([ ]).