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  • Usage in publication:
    • Tygh Valley Formation
  • Modifications:
    • Named
    • Geochronologic 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 Tygh Valley Formation of the Dalles Group. Consists of interbedded basaltic, andesitic, and pumiceous sandstone and conglomerate, tuffaceous sandstone and siltstone, tuff, breccia, and agglomerate in the Tygh basin. Disconformably overlies the Frenchman Springs Member of the Wanapum Basalt and the Grande Ronde Basalt, both of the Columbia River Basalt Group; underlies Miocene and Pliocene andesite flows of the Cascade Range. Age is middle Miocene to Pliocene based on radiometric (K-Ar) ages. (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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