from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A loose deposit of rock debris accumulated through the action of gravity at the base of a cliff or slope.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A loose accumulation of rock and soil debris at the foot of a slope


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin, a collection of washings, dregs, from colluere, to wash thoroughly : com-, intensive pref.; see com- + -luere, to wash; see leu(ə)- in Indo-European roots.


  • This technique has potential in highly permeable debris materials, such as colluvium with a low proportion of fines.

    2.1 Retaining walls

  • The first coyote returned with two friends and all three began to tug the carcass toward the edge of the colluvium pile, a drop-off of about ten feet.

    Bird Cloud

  • I looked again at the distant nest, then noticed that on the debris pile of colluvium below and a little to the west of the nest there were two elk.

    Bird Cloud

  • Here the cliff was a series of shelves separated by steep colluvium deposits.

    Bird Cloud

  • We scratched around but did not find any bison remains in the colluvium pile below, and the seemingly carefully placed stones at the front of the shallow cave were only natural rockfall from the ceiling.

    Bird Cloud

  • It also has less bouldery colluvium than those two surrounding regions and more saprolite.

    Ecoregions of North Carolina and South Carolina (EPA)

  • Soils are mostly Inceptisols and Ultisols that were derived from residuum, colluvium, or glacial till.

    Ecoregions of New Jersey (EPA)

  • Streams have cut down into the limestone, but the gorge talus slopes are composed of colluvium with huge angular, slabby blocks of sandstone.

    Ecoregions of Tennessee (EPA)

  • Mountain soils are formed in very stony and gravelly colluvium material over bedrock.

    Ahklun Mountains Tundra - Meadow Province (Bailey)

  • Soils in Ecoregion 72g are usually Alfisols. they developed from thick loess on bluff tops, and thin loess, acidic residuum, or colluvium on steep slopes (Natural Resources Conservation Service, various dates).

    Ecoregions of Illinois (EPA)


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