U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Units: Big River
Map showing publication footprint
  • Usage in publication:
    • Big River Dolostone*
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolostone
  • AAPG geologic province:
    • Alaska West-Central region
Publication:

Babcock, L.E., Blodgett, R.B., and St. John, James, 1994, New late (?) Proterozoic-age formations in the vicinity of Lone Mountain, McGrath quadrangle, west-central Alaska, IN Till, A.B., and Moore, T.E., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1993: U.S. Geological Survey Bulletin, 2107, p. 143-155.


Summary:

Unit is named the Big River Dolostone for the Big River west of Lone Mountain, Alaska. Consists of dolomitic mudstone with fenestral fabric and numerous packstone to grainstone beds composed of poorly-sorted coated grains having a maximum diameter of 10 mm. Weathers light to medium gray; fresh color is medium to dark gray. Thickness is 198.5 m at type. Lower contact with the Windy Fork Formation (new) is sharp and conformable; upper contact with Lone Formation (new) is sharp and conformable. Age is Late(?) Proterozoic.

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 28 Aug 2025 01:59:10 PM MDT