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National Geologic Map Database
Geologic Unit: Poinsettia
Map showing publication footprint
  • Usage in publication:
    • Poinsettia Tuff Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Rhyodacite
    • Tuff
  • AAPG geologic province:
    • Great Basin province
Publication:

Ekren, E.B., Byers, F.M., Jr., Hardyman, R.F., Marvin, R.F., and Silberman, M.L., 1980, Stratigraphy, preliminary petrology and some structural features of Tertiary volcanic rocks in the Gabbs Valley and Gillis Ranges, Mineral County, Nevada: U.S. Geological Survey Bulletin, 1464, 54 p.


Summary:

Named as upper member (of 3) of Hu-pwi Rhyodacite. Type locality at exposures in T10N R33E, 2 km south-southeast of Poinsettia Spring, north Gabbs Valley Range, Mineral Co, NV. Consists of gray, reddish-gray, and brown rhyodacite and quartz latite welded tuff. Forms five porphyritic multiple-flow cooling units. Ranges from 1 to 500 m in thickness. Overlies Nugent Tuff Member (new) (Hu-pwi Rhyodacite). Underlies lava of Mount Ferguson or tuff of Copper Mountain. Has K-Ar age of 23 to 22 Ma. Is Miocene 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 ([ ]).

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