- Usage in publication:
-
- Vega Bay formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Pyroclastics
- Volcanics
- AAPG geologic province:
-
- Aleutian Islands province
- Alaska Southwestern region
Summary:
Type locality designated along coast of Vega Bay between 177 deg 22' and 117 deg 25'E, west of Gertrude Cove, Kiska Island, Rat Island group, Aleutian Islands, AK. Underlies south half of Kiska and most of Little Kiska Island. Consists predominantly of pyroclastic rocks, interbedded with substantial amounts of flow rocks and minor amounts of sandstone and conglomerate (which is composed of reworked volcanic material). No complete section is exposed. Is 2000 ft at type locality. Underlies Kiska Harbor formation (new). Age is considered to be middle Tertiary on basis of degree of deformation and alteration of constituents and correlation with rocks containing fossils.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Vega Bay Formation*
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
-
- Aleutian Islands province
- Alaska Southwestern region
Summary:
Vega Bay Formation. Sample from andesitic lava yielded K-Ar age of 55.3 +/-6.7 Ma.
Source: Modified from GNU records (USGS DDS-6; Denver 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 ([ ]).