- Usage in publication:
-
- Delleker formation
- Modifications:
-
- Original reference
- Dominant lithology:
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- Tuff
- AAPG geologic province:
-
- Sierra Nevada province
Durrell, Cordell, 1957, Tertiary stratigraphy of the Blairsden quadrangle, Plumas County, California [abs.]: American Association of Petroleum Geologists, Pacific Petroleum Geology Newsletter, v. 11, no. 3, p. 3.
Summary:
Pg. 3. Delleker formation. Welded rhyolite tuff with gravel at base. About 350 feet thick; thickens to east and is probably equivalent to identical tuffs of early Miocene age, west of Pyramid Lake, Nevada. Unconformable below Bonta formation (new); rests unconformably on Clover formation (new) and all older rocks; unconformities marked by faulting.
Named from recently abandoned sawmill community of Delleker, [northeastern CA], which is partly on Blairsden and partly on Portola quadrangles; name appears only on the latter, edition of 1950. Most representative section is in Blairsden quadrangle in sec. 32, T. 23 N., R. 13 E., 2.5 mi west of Delleker on east side of Willow Creek.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1081).
- Usage in publication:
-
- Delleker formation
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
Pg. 165 (fig. 1), 170-172. Delleker formation. Consists mostly of biotite sanidine rhyolite tuff, but contains some gravel, mostly near base. Thickness 350 feet. Overlies Ingalls formation (new); in some areas, rests on both Ingalls and Lovejoy formations; underlies Bonta formation. Probably lower or middle Miocene; chart shows middle Miocene(?).
Source: US geologic names lexicon (USGS Bull. 1200, p. 1081).
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 ([ ]).