- Usage in publication:
-
- Ursus Member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Alaska Peninsula province
- Alaska Southwestern region
Summary:
Named as upper member (of three) in Kamishak Formation. Type section designated as exposures on south side of Brown Peak, north of Ursus Cove, Cook Inlet, Iliamna quad, Alaska Peninsula, AK. Consists of light-gray limestone, locally dolomitic with interbedded chert and tuff. Is thin-bedded with fossil fragments. Thickness is over 150 m. Cut by mafic dikes. Gradationally overlies unnamed middle member of Kamishak Formation. Disconformably underlies Talkeetna Formation. Intruded by Jurassic rocks of Alaska-Aleutian Range batholith. Assigned Late 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 ([ ]).