U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Gillis
Search archives
Map showing publication footprint
  • Usage in publication:
    • Gillis Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Volcaniclastics
    • Limestone
  • AAPG geologic province:
    • Great Basin province
Publication:

Rogers, J.J.W., Burchfiel, B.C., Abbott, E.W., and and others, 1974, Paleozoic and lower Mesozoic volcanism and continental growth in the western United States: Geological Society of America Bulletin, v. 85, no. 12, p. 1913-1924.


Summary:

[Named] for sequence of volcanic rocks restricted to Gillis Range in area of Hawthorne, Mineral Co, NV. Formerly grouped with Excelsior Formation (Muller and Ferguson, 1939). Consists of volcanic flow and pyroclastic rocks interbedded with limestone. Virtually all rocks are porphyritic. Thickness is over 1000 m. Thrusted over Luning Formation. May represent an overlap assemblage on Golconda allochthon formed in Sonoma Orogeny. Limestone is of early Middle Triassic age.

Source: 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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:41:14 PM MDT