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Geologic Unit: Frenchie Creek
Map showing publication footprint
  • Usage in publication:
    • Frenchie Creek Rhyolite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Rhyolite
    • Rhyodacite
  • AAPG geologic province:
    • Great Basin province
Publication:

Muffler, L.J.P., 1964, Geology of the Frenchie Creek quadrangle, north-central Nevada: U.S. Geological Survey Bulletin, 1179, 99 p., (incl. geologic map, scale 1:62,500)


Summary:

Named for Frenchie Creek as upper member of 3 of Pony Trail Group. Type section for group designated as Pony Trail Canyon in Frenchie Creek and Pine Valley 15' quads, Eureka Co, NV. Consists predominantly of maroon or black rhyolite and rhyodacite flows. Subordinate rock types include altered green and white flow breccias and scarce volcanic rocks. Thickness at type is about 2500 ft. Overlies Sod House Tuff (new) (Pony Trail Group). Cut by Lower Cretaceous plutons. Assigned Mesozoic age.

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


Map showing publication footprint
  • Usage in publication:
    • Frenchie Creek Rhyolite*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Great Basin province
Publication:

Smith, J.F., Jr., 1974, Age of Pony Trail Group in Cortez Mountains, Eureka County, Nevada, IN Cohee, G.V., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1972: U.S. Geological Survey Bulletin, 1394-A, p. A83.


Summary:

Frenchie Creek Rhyolite in Cortez Mountains is considered Late Jurassic on basis of 151 +/-3 Ma age on biotite from unit (R.L. Armstrong, written commun., 1972). All three formations in Pony Trail Group, Big Pole Formation, Sod House Tuff, and Frenchie Creek Rhyolite, are now considered Jurassic and probably Late(?) Jurassic age.

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


Map showing publication footprint
  • Usage in publication:
    • Frenchie Creek Rhyolite*
  • Modifications:
    • Areal extent
    • Age modified
  • AAPG geologic province:
    • Great Basin province
Publication:

Smith, J.F., Jr., and Ketner, K.B., 1976, Stratigraphy of post-Paleozoic rocks and summary of resources in the Carlin-Pinon Range area, Nevada, IN Geology of the Carlin-Pinon Range area, Nevada: U.S. Geological Survey Professional Paper, 867-B, p. B1-B48, (incl. geologic map, scale 1:125,000)


Summary:

Mapped in Carlin-Pinon Range area. Rhyolite(?) plug in sec.32 T30N R51E forms extension of plug into this area from Frenchie Creek quad. Age is Late Jurassic based on 151 +/-3 Ma age (R.L. Armstrong, written commun., 1972) and time scale of Harland and others (1964).

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


Map showing publication footprint
  • Usage in publication:
    • Frenchie Creek Rhyolite*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Great Basin province
Publication:

Coats, R.R., 1987, Geology of Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin, no. 101, 112 p., (incl. geologic map, scale 1:250,000), Prepared in cooperation with USGS


Summary:

Unit geographically extended in Elko Hills as shown on map. Age shown as Jurassic.

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


Map showing publication footprint
  • Usage in publication:
    • Frenchie Creek Rhyolite*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Great Basin province
Publication:

Ketner, K.B., and Alpha, A.G., 1992, Mesozoic and Tertiary rocks near Elko, Nevada; Evidence for Jurassic to Eocene folding and low-angle faulting, IN Evolution of sedimentary basins; Eastern Great Basin: U.S. Geological Survey Bulletin, 1988-C, p. C1-C13.


Summary:

Pg. C5-C6; Geol. map of Elko Hills, Elko Co., NV, USGS Misc. Inv. Ser. Map I-2082, 1990. Frenchie Creek Rhyolite. Geographically restricted from the Elko Hills (as mapped by Coats, geol. map of Elko County, Nevada, 1987) and rocks are reassigned to informal unit (rhyodacite of Elko Mountain of Eocene age).

Source: Publication; 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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