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Geologic Units: Davidson
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Map showing publication footprint
  • Usage in publication:
    • Davidson diorite
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Great Basin province
Publication:

Gianella, V.P., 1934, New features of the geology of the Comstock lode: Mining and Metallurgy, v. 15, no. 331, p. 298-300.


Summary:

Pg. 299. Davidson diorite is mentioned as an ore-bearing unit of the Comstock lode. Clearly intrusive but its precise place in geologic events of area is undetermined. Age is not given.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1049); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Davidson diorite
  • Modifications:
    • Principal reference
  • AAPG geologic province:
    • Great Basin province
Publication:

Gianella, V.P., 1936, Geology of Silver City district and southern portion of Comstock Lode, Nevada: Nevada Bureau of Mines and Geology and Mackay School of Mines Bulletin, no. 29, 105 p., (incl. geologic map, scale 1:33,867), Also issued as Univ. Nevada Bull., v. 30, no. 9, 1936


Summary:

Pg. 64-68. Davidson diorite. Described as medium-grained granular rock of light-gray color. Contains many andesite inclusions. Age is Miocene. Intruded the Alta andesites, probably about middle Miocene.
Type locality not designated. Named from Mount Davidson [in T. 16 N., R. 22 E.,] Virginia City 7.5-min quadrangle, Lyon Co., western NV. Makes up bulk of Mount Davidson.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1049); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Davidson diorite*
  • Modifications:
    • Adopted
  • AAPG geologic province:
    • Great Basin province
Publication:

Calkins, F.C., 1944, Outline of the geology of the Comstock Lode district, Nevada: U.S. Geological Survey Open-File Report, OFR-45-29, 35 p., (incl. map by Calkins and Thayer, 1945, scale 1:24,000)


Summary:

Davidson diorite (Gianella, 1934; 1936) is adopted. Age is Miocene(?).

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


Map showing publication footprint
  • Usage in publication:
    • Davidson granodiorite*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Great Basin province
Publication:

Thompson, G.A., 1956, Geology of the Virginia City quadrangle, Nevada, IN Contributions to economic geology, 1956: U.S. Geological Survey Bulletin, 1042-C, p. C45-C75, (incl. geologic map, scale 1:62,500)


Summary:

Pg. 52-54, pl. 3. Gianella's (1936) Davidson diorite is renamed Davidson granodiorite. Intrudes Alta formation. May be contemporaneous with parts of Kate Peak formation; cannot be younger than all of Kate Peak because it is cut by a few dikes of andesite porphyry of Kate Peak formation. Age is Miocene(?).

Source: US geologic names lexicon (USGS Bull. 1200, p. 1049); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Davidson Granodiorite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Great Basin province
Publication:

Whitebread, D.H., 1976, Alteration and geochemistry of Tertiary volcanic rocks in parts of the Virginia City quadrangle, Nevada: U.S. Geological Survey Professional Paper, 936, 43 p.


Summary:

Age of the Davidson Granodiorite is Miocene.

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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