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Geologic Unit: Selah
Map showing publication footprint
  • Usage in publication:
    • Selah tuff member
  • Modifications:
    • Named
  • Dominant lithology:
    • Pumice
    • Gravel
  • AAPG geologic province:
    • Columbia basin
Publication:

Mackin, J.H., 1947, Diatomite deposits in eastern Washington [abs.]: Northwest Science, v. 21, no. 1, p. 33.


Summary:

Name proposed for member of Ellensburg formation. Is generally similar in lithology to Ellensburg formation but contains distinctive beds of pumicite and quartzitic gravel. Overlies Yakima basalt; underlies Wenas basalt member of Ellensburg formation. Age is Miocene and Pliocene.
Type locality: exposures on south flank of Selah Ridge in Yakima-Ellensburg area, south-central WA. Named from Selah Ridge.

Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1200, p. 3516).


Map showing publication footprint
  • Usage in publication:
    • Selah formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Columbia basin
Publication:

Laval, W.N., 1956, Stratigraphy and structural geology of portions of south-central Washington: Dissertation Abstracts, v. 16, no. 5, p. 945.


Summary:

Rank raised to formation. Consists essentially of fluviatile and aeolian clastics of volcanic origin. Miocene to Pliocene formations are (ascending); Yakima basalt, Selah, Wenas basalt and Ellensburg. This sequence comprises part of two mutually interfingered lithosomes --one of sedimentary rocks and other of flood lavas. Age is Miocene and Pliocene.

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


Map showing publication footprint
  • Usage in publication:
    • Selah Tuff Member†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Eastern Columbia basin
Publication:

Bingham, J.W., and Grolier, M.J., 1966, The Yakima Basalt and Ellensburg Formation of south-central Washington, IN Contributions to stratigraphy, 1965: U.S. Geological Survey Bulletin, 1224-G, p. G1-G15.


Summary:

Pg. G13-G14. †Selah Tuff Member of Ellensburg Formation of Mackin (1947) abandoned. Rocks reallocated to Beverly Member of Ellensburg Formation.

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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