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Map showing publication footprint
  • Usage in publication:
    • Bead Lake formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Argillite
  • AAPG geologic province:
    • Northern Cascade Range-Okanagan province
Publication:

Schroeder, M.C., 1952, Geology of the Bead Lake district, Pend Oreille County, Washington: Washington Division of Mines and Geology Bulletin, no. 40, 57 p., (incl. geologic map, scale 1:63,360)


Summary:

Pg. 7 (table), 10-11, 20, pl. 1. Bead Lake formation of Newport group (new). Fine-grained argillaceous and quartzitic sandstones with quantities of light-colored argillite and light-colored arenaceous argillite. Thickness about 12,500 feet. Injected by Marshall diorite (new). Underlies No Name argillite (new) of Newport group, contact gradational; base of formation not exposed. Probably = part of Prichard Formation of Clark Fork district, Idaho (see A.L. Anderson, 1930, Idaho Bur. Mines. Geol. Bull., no. 12). Age is pre-Cambrian.
Named from Bead Lake, [Bead Lake and Skookum Creek 7.5-min quadrangles], Pend Oreille Co., northeastern WA. Crops out in Bead Lake district.

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 248-249).


Map showing publication footprint
  • Usage in publication:
    • Bead Lake Formation†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Northern Cascade Range-Okanagan province
Publication:

Miller, F.K., 1974, Preliminary geologic map of the Newport Number 1 quadrangle, Pend Oreille County, Washington, and Bonner County, Idaho: Washington Division of Geology and Earth Resources Geologic Map, GM-7, 1 sheet, 7 p., scale 1:62,500


Summary:

Pg. 1 (pamphlet). †Bead Lake Formation of Newport Group of Schroeder (1952) abandoned. Belt rocks here can be correlated directly with those in Coeur d'Alene district, Idaho (see Hobbs and others, 1965, USGS Prof. Paper 478) and around Lake Pend Oreille, Idaho (see Harrison and Jobin, 1963, USGS Bull. 1141-K, and 1965, USGS Geol. Quad. Map GQ-375). Therefore, the names Newport Group, Bead Lake Formation, No Name Argillite, and Skookum Formation proposed by Schroeder (1952, p. 9) are abandoned in favor of the older and more widely used Belt terminology.
[See also F.K. Miller, Prelim. geol. map Newport No. 2 quad., Pend Oreille and Sevens Cos., WA, Washington Div. Geol. Earth Sci. Geol. Map, GM-8, 1974, and F.K. Miller, Prelim. geol. map Newport No. 3 quad., Pend Oreille, Sevens, and Spokane Cos., WA, Washington Div. Geol. Earth Sci. Geol. Map, GM-9, 1974.]

Source: Publication.


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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