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Geologic units containing colluvium
A general term applied to any loose, heterogeneous, and incoherent mass of soil material and/or rock fragments deposited by rainwash, sheetwash, or slow, continuous downslope creep, usually collecting at the base of gentle slopes or hillsides.
- Landslide deposits (Phanerozoic | Cenozoic | Quaternary)
- Locally includes talus, rock-glacier, and thick colluvial deposits
- Basalt flows, basaltic pyroclastic and clastic debris; Middle Pleistocene canyon-filling and plateau lava flows, pyroclastic debris, alluvium, and colluvium; Snake River Plain (Middle Pleistocene)
- Middle Pleistocene plateau and canyon-filling basalt in and near Snake Plain.
- Clastic debris; Quaternary colluvium, fanglomerate, talus, and glacial deposits; upland-valley margins (Quaternary)
- Quaternary colluvium, fanglomerate, and talus plus some glacial debris in upland valleys.
- Gravel, sand, and clay; Quaternary-Tertiary colluvium and fanglomerate; western Idaho (Pleistocene and Pliocene)
- Pleistocene and Pliocene fanglomerate, colluvium, and poorly sorted gravel deposits.
- Gravel, sand, and silt; Quaternary; alluvium (Quaternary)
- Quaternary alluvium; may contain some glacial deposits and colluvium in uplands
- 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.
- New Mexico
- landslide deposits and colluvium (Phanerozoic | Cenozoic | Quaternary)
- Landslide deposits and colluvium
- Landslide deposits (Quaternary)
- LANDSLIDE DEPOSITS
- Fanglomerate (Holocene? and Pleistocene) (Pleistocene to Holocene)
- Poorly sorted and poorly stratified alluvial fan debris, slope wash, colluvium, and talus; composed mostly of silt and fragments of basalt, basaltic andesite, and andesite. In places includes small areas of pediment gravels and colluvium
- Quaternary alluvium and colluvium (Quaternary)
- Alluvium and Colluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)
- ALLUVIUM AND COLLUVIUM--Clay, silt, sand, and gravel in flood plains, fans, terraces, and slopes.
- Undivided surficial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)
- UNDIVIDED SURFICIAL DEPOSITS--Mostly alluvium, colluvium, and glacial and landslide deposits. Primarily in Yellowstone area and Bighorn Mountains.