- Usage in publication:
-
- Eva Formation*
- Modifications:
-
- Geochronologic dating
- Dominant lithology:
-
- Loess
- Peat
- Silt
- AAPG geologic province:
-
- Alaska East-Central region
Summary:
Named for exposures at type section in north wall of Eva Creek mining cut in NW 1/4 of sec.5 T1S R2W, 16 km west of Fairbanks, Fairbanks D-3 quad, AK. Composed of peat lenses, sticks, logs, and rooted stumps in loess-like silt rich in minute carbonized plant fragments. Silt is reworked loess and soil. Thickness is 1 m. Unconformably overlies Gold Hill Loess. Conformably underlies Goldstream Formation (new). Radiocarbon ages obtained on stumps range from 56,900 to 24,000 yr B.P. Assigned Pleistocene (Sangamon) 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 ([ ]).