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Geologic units containing Loess

  1. Earth material
  2. Unconsolidated material
  3. Eolian material
Loess
A widespread, homogeneous, commonly nonstratified, porous, friable, slightly coherent, usually highly calcareous, fine-grained blanket deposit, consisting predominantly of silt with subordinate grain sizes ranging from clay to fine sand.
Arkansas - Colorado - Idaho - Kentucky - Missouri - Mississippi - Washington - Wyoming

Arkansas

Loess (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Early)
Loess

Colorado

Eolian deposits (Phanerozoic | Cenozoic | Quaternary)
Includes dune sand and silt and Peoria Loess
 Older eolian deposits (Phanerozoic | Cenozoic | Quaternary)
Includes Loveland Loess

Idaho

Silt; Pleistocene wind-blown loess dunes; northwestern Idaho, Palouse Hills (Pleistocene)
Pleistocene wind-blown loess of northern Idaho.
Silt; Quaternary wind-blown loess; eastern Snake River Plain and Basin and Range provinces (Quaternary)
Quaternary wind-blown deposits; most commonly a loess mantle east of the Snake Plain.
 Surficial sediments; Quaternary alluvial, lacustrine, eolian, and glacial-outwash deposits, undivided; Snake River Plain, and Basin-and-Range provinces (Quaternary)
Quaternary surficial cover; Snake Plain stream, lake, wind and glacial-flood mantle.

Kentucky

Continental deposits and loess, undifferentiated (Tertiary to Quaternary)
Continental deposits and loess, undifferentiated; West of the Tennessee River

Missouri

PLEISTOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Pleistocene)
PLEISTOCENE SERIES - Loess, till, drift, clay, silt, sand and gravel (shown on cross section, not on map)

Mississippi

Loess and brown loam (Pleistocene)
Loess and brown loam - Grayish to yellowish-brown massive silt; the pattern indicates the area within which the loess is generally thicker than ten feet; remnants of the mantle are present many miles farther east.

Washington

Quaternary nonmarine deposits (Pleistocene)
Predominantly a well-cemented, heterogeneous mixture of volcanic gravel, sand, silt, and clay. Contains some till and in western Washington is commonly deeply weathered.
 Quaternary nonmarine deposits (Pleistocene)
Periglacial eolian deposits. Buff to light-brown, massive, homogenous, unconsolidated loessial silt; some water-laid material locally. Probably early Pleistocene.

Wyoming

Dune sand and loess (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)
DUNE SAND AND LOESS--Includes active and dormant sand dunes. In northwestern Wyoming is chiefly loess (age 12,000-19,000 years).