- Usage in publication:
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- No Name argillite
- Modifications:
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- Original reference
- Dominant lithology:
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- Argillite
- AAPG geologic province:
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- Northern Cascade Range-Okanagan province
Summary:
Pg. 7 (table), 11-13, 20, pl. 1. No Name argillite of Newport group (new). Predominantly dark-gray argillite with occasional argillaceous sandstone beds and limestone lenses. Thickness about 4,200 feet. Middle formation of Newport group. Gradationally underlies Skookum formation (new), transition zone about 400 feet thick; gradationally overlies Bead Lake formation (new), transition zone about 200 feet thick. 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 No Name Peak, [Skookum Creek 7.5-min quadrangle], Pend Oreille Co., northeastern WA.
Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 2757).
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 ([ ]).