- Usage in publication:
-
- Wyman schists
- Wyman formation
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Schist
- Phyllite
- Dolomite
- AAPG geologic province:
-
- Great Basin province
Maxson, J.H., 1934, Pre-Cambric stratigraphy of the Inyo Range [California] [abs.]: Pan-American Geologist, v. 61, no. 4, p. 311.
Summary:
Pg. 311; J.H. Maxson, 1935, GSA Proc. 1934, p. 314. Wyman schists (1934); Wyman formation (1935). Spotted schists and phyllites with a few interbedded dolomites. Thickness 3,700+/- feet in Wyman Canyon. Unconformably underlies Reed formation and overlies (unconformably?) Roberts formation. Age is pre-Cambrian.
Wyman Canyon section, Inyo Range, Bishop quadrangle (scale 1:125,000), Inyo Co., central eastern CA, consists of: Silver Peak shales, limestones and sandstones bearing OLENELLUS; the Campito sandstone, 2,000 feet; Deep Springs formation, 2,100 feet; Reed dolomite, 2,900 feet; Wyman schists, 3,700 feet; and Roberts schist, 2,500 feet.
Source: US geologic names lexicon (USGS Bull. 896, p. 2377, Roberts entry p. 1822).
- Usage in publication:
-
- Wyman Formation*
- Modifications:
-
- Revised
- Adopted
- AAPG geologic province:
-
- Great Basin province
Summary:
Pg. 140-141, 143 (fig. 3); C.A. Nelson, 1966a, Geol. map Waucoba Mountain quadrangle, CA, USGS Geol. Quad. Map GQ-528, 1 sheet, scale 1:62,500; C.A. Nelson, 1966b, Geol. map Blanco Mountain quadrangle, CA, USGS Geol. Quad. Map GQ-529, 1 sheet, scale 1:62,500.
Wyman Formation. Detailed mapping in area of type section of the Wyman and Roberts formations and over large areas in the Waucoba Mountain and Waucoba Spring [15-min] quadrangles, Inyo County, California, suggests that no unconformity is present and that no persistent formational subdivision is presently possible. Accordingly the total succession of original Wyman and Roberts strata is referred to the Wyman Formation.
Consists of brown to dark-gray, thin-bedded argillite that is locally phyllitic, brown, fine-grained, quartzitic sandstone, and gray-brown siltstone, interbedded with gray-blue, lenticular, oolitic limestone that in places is dolomitized. Thickness about 9,000 feet; base not exposed. Regional unconformity separates the Wyman from overlying Reed Formation (Reed Dolomite). Age is considered Precambrian.
[GNC remark (US Geologic Names Committee unpub. changes to geologic nomenclature, January 1, 1962-June 30, 1962, p. 20): This definition of Wyman Formation adopted by the USGS.]
Source: Publication; GNC changes in geologic nomenclature, unpub., Jan. 1, 1962-June 30, 1962, p. 20.
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 ([ ]).