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  • Usage in publication:
    • Shellrock Point Volcanics
  • Modifications:
    • Named
  • AAPG geologic province:
    • Okanogan province
Publication:

Menzer, F.J., Jr., 1983, Metamorphism and plutonism in the central part of the Okanogan range, Washington: Geological Society of America Bulletin, v. 94, no. 4, p. 471-498.


Summary:

Unit is named the Shellrock Point Volcanics. Is exposed on Pogue Mountain and Pogue Flat in the Okanogan Range, WA. Consists of quartz keratophyre flows containing medium-grained phenocrysts of quartz and pink albite in a dense white to pale-green groundmass. May be older than the Miocene Columbia River Basalt [Group]; may correlate with early Tertiary keratophyre flows to the north. (B1565)

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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