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  • Usage in publication:
    • Alkali Canyon Formation
  • Modifications:
    • Named
    • Biostratigraphic dating
  • AAPG geologic province:
    • Columbia basin
Publication:

Farooqui, S.M., Beaulieu, J.D., Bunker, R.C., Stensland, D.E., and Thoms, R.E., 1981, Dalles Group; Neogene formations overlying the Columbia River Basalt Group in north-central Oregon: Oregon Department of Geology and Mineral Industries, Oregon Geology, v. 43, no. 10, p. 131-140.


Summary:

Unit is named the Alkali Canyon Formation of the Dalles Group. Consists of vitric tuff, silty clay, silt, and basalt gravel alluvial fan and braided stream deposits in the Arlington basin. Conformably and unconformably overlies units of the Columbia River Basalt Group and the Ellensburg Formation; underlies Quaternary loess. Age is late Miocene and early Pliocene(?) based on fossils [vertebrates]. (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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