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Loess

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Windblown clayey silt and fine sand. Includes the Pleistocene Palouse Formation and deposits derived mostly from reworking of Palouse Formation. Contains local interbedded layers of soil, caliche, and some water-laid silt and gravel
State Oregon
Name Loess
Geologic age Pleistocene to Holocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Eolian-loess)
Unconsolidated > Coarse-detrital > Sand (Eolian-loess)
Minor
Unconsolidated > Coarse-detrital > Gravel (Eolian-loess)
Stratigraphic units Palouse Formation
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Walker, G.W., 1973, Reconnaissance geologic map of the Pendleton quadrangle, Oregon and Washington: U.S. Geological Survey Miscellaneus Geologic Investigations Map I-727, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i727

Walker, G.W., 1977, Geologic map of Oregon east of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-902, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i902
NGMDB product
Counties Umatilla