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Geologic Unit: Osobb
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Map showing publication footprint
  • Usage in publication:
    • Osobb formation*
  • Modifications:
    • Mapped
    • Areal extent
  • Dominant lithology:
    • Quartzite
    • Shale
  • AAPG geologic province:
    • Great Basin province
Publication:

Ferguson, H.G., Muller, S.W., and Roberts, R.J., 1951, Geology of the Mount Moses quadrangle, Nevada: U.S. Geological Survey Geologic Quadrangle Map, GQ-12, 1 sheet, scale 1:125,000


Summary:

Osobb formation is geographically extended into the Mount Moses quadrangle (scale 1:100,000) quadrangle, north central Nevada. Consists of white quartzite and some shale, both intensely altered by contact metamorphism. Exposed thickness less than 500 feet; only lower part exposed. Overlies the Cane Spring formation. Age is Late Triassic.

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


Map showing publication footprint
  • Usage in publication:
    • Osobb formation*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartzite
    • Sandstone
    • Shale
  • AAPG geologic province:
    • Great Basin province
Publication:

Muller, S.W., Ferguson, H.G., and Roberts, R.J., 1951, Geology of the Mount Tobin quadrangle, Nevada: U.S. Geological Survey Geologic Quadrangle Map, GQ-7, 1 sheet, scale 1:125,000


Summary:

Osobb formation. Quartzitic sandstone, shale, and some lenses of limestone and dolomite. Sandstone markedly cross-bedded; some limestone and dolomite of bioclastic origin. Exposed thickness about 2,000 feet. Conformably overlies Cane Spring formation (new); upper plate of Tobin thrust. Interpreted to represent shallow water deposition. Age is Late Triassic, based on fossils [mollusks].
Type locality: southwest slope of Augusta Mountain at north end of Dixie Valley (Osobb Valley of 40th Parallel Survey).

Source: US geologic names lexicon (USGS Bull. 1200, p. 2865-2866); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Osobb Formation*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Great Basin province
Publication:

Burke, D.B., and Silberling, N.J., 1973, The Auld Lang Syne Group, of Late Triassic and Jurassic(?) age, north-central Nevada, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1394-E, p. E1-E14.


Summary:

Osobb Formation is named as the second of 9 formations of the Auld Lange Syne Group. Type locality of Muller and others (1951) redesignated as type area; new, more geographically restricted type locality designated: sec. 21, T25N R39E, Cain Mountain 15' quad, Pershing Co., NV. Overlies the Cane Spring Formation in the northern Augusta Mountain; overlies the Natchez Pass Formation and underlies the Dun Glen Formation in southern Tobin Range. Interfingers with the Grass Valley Formation. Age is Late Triassic (Norian).

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


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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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