- Usage in publication:
-
- Eider Point basalt*
- Modifications:
-
- Named
- Dominant lithology:
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- Basalt
- AAPG geologic province:
-
- Aleutian Islands province
- Alaska Southwestern region
Summary:
Named Eider Point basalt for rocks of Wide Bay Cove above Eider Point which are typical of unit [Unalaska Island, Aleutian Islands, AK]. Contains numerous small cones, associated volcanic mud flows and lava flows scattered about in northern bulge of Unalaska Island. One of these cones is still active. Flows are grayish purple to brownish gray and relatively thin. Chemical and spectrographic analyses of 5 rocks of Eider Basalt appear in table 1. Unconformably overlies Makushin volcanics (new) or older rocks. Dominantly pyroclastic rocks are separately mapped from dominantly lava of unit on geologic map of Unalaska Island. Age shown as Pleistocene and Holocene.
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 ([ ]).