The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.
|
|---|
- Usage in publication:
-
- Swamp Creek Member
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Basalt
- AAPG geologic province:
-
- Idaho Mountains province
Summary:
Swamp Creek Member of Saddle Mountains Basalt of Columbia River Basalt Group. Present in upper North Fork area of the Clearwater embayment in Idaho. Consists of medium- to coarse-grained olivine basalt containing abundant olivine phenocrysts; has normal polarity. Lies above the basalt of Weippe in the Pomona Member of Saddle Mountains Basalt. Age is late Miocene.
Type locality: Swamp Creek, North Fork of the Clearwater River, [Little Green Mountain 7.5-min quadrangle], Clearwater Co., ID.
Source: US geologic names lexicon (USGS Bull. 1565, p. 314); 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 ([ ]).