- Usage in publication:
-
- Lone Formation*
- Modifications:
-
- Named
- Dominant lithology:
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- Siltstone
- Sandstone
- Redbeds
- AAPG geologic province:
-
- Alaska West-Central region
Summary:
Unit is named the Lone Formation for Lone Mountain, Alaska. Dominated by siltstone and sandstone intervals that weather to maroon or variegated colors including earthy yellow, tan, white, gray, gray-green, or reddish-brown. Interbeds of lime mudstone or dolomitic mudstone are up to 12 m thick, and weather to various colors, including gray, tan, earthy yellow, orange, and pink. Thickness is 107.5 m at type. Lower contact with the Big River Dolostone (new) is sharp and conformable; upper contact with the Khuchaynik Dolostone (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 ([ ]).