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National Geologic Map Database
Geologic Unit: Hornsilver
Map showing publication footprint
  • Usage in publication:
    • Hornsilver dolomite member*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Eagle basin
Publication:

Tweto, Ogden, 1949, Stratigraphy of the Pando area, Eagle County, Colorado: Colorado Scientific Society Proceedings, v. 15, no. 4, p. 149-235.


Summary:

Pg. 152 (table 1), 199, 216-217. Hornsilver dolomite member of Minturn formation. Massive gray dolomite 12 to 16 feet thick overlain by 8 to 14 feet of thin-bedded gray dolomite. About 2,900 feet above base of formation. Lies about 800 feet below base of Resolution dolomite member (new); about 300 feet above Wearyman dolomite member (new). Age is Pennsylvanian.
Named from exposures on south slope of Hornsilver Mountain, Pando area, Eagle Co., northwestern CO.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1806).


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).