Colluviumcolluvium, colluvium soil
Colluvium is a general name for loose, unconsolidated sediments that have been deposited at the base of hillslopes by either rainwash, sheetwash, slow continuous downslope creep, or a variable combination of these processes Colluvium is typically composed of a heterogeneous range of rock types and sediments ranging from silt to rock fragments of various sizes This term is also used to specifically refer to sediment deposited at the base of a hillslope by unconcentrated surface runoff or sheet erosion
- 1 Location
- 2 Importance
- 3 Colluvium vs alluvium
- 4 See also
- 5 References
- 6 External links
Colluviation refers to the buildup of colluvium at the base of a hillslope12 Colluvium is typically loosely consolidated angular material located at the base of a steep hill slope or cliff Colluvium accumulates as gently sloping aprons or fans, either at the base of or within gullies and hollows within hillslopes These accumulations of colluvium can be several meters in thickness and often contain buried soils paleosols, crude bedding, and cut and fill sequencescitation neededThis talus accumulation is an example of colluvium
Thick accumulations of colluvium may preserve a rich record of long term paleoclimatic change based on the paleosols and the remains of plants and animals, invertebrate and vertebrates that they often contain2 These fossils indicate previous geologic and environmental settings Thick accumulations of colluvium often contain well-preserved and sometimes deeply buried archaeological deposits as excavated at the Cherokee Sewer Site, Cherokee County, Iowa, and the Koster Site, Greene County, Illinois34 Colluvium can also be rocks that have been transported downward from glaciers and so can indicate past stages of cooler and/or wetter weather Deposits of detrital colluvium can reveal the soil composition and signify processes of chemical weathering
Colluvium vs alluviumedit
The definitions of colluvium and alluvium are interdependent and reliant on one another Distinctions between the two are important in order to properly define the geomorphic processes that have occurred in a specific geological setting Alluvium is sand, clay, or other similar detrital material deposited by running water5 The distinction between colluvium and alluvium relates to the involvement of running water Alluvium specifically refers to the geomorphic processes involved with flowing water and so alluvium is generally fine-grained clay and silt material that has the capacity to be entrained in water currents and eventually deposited For these same reasons, alluvium is also generally well sorted material while colluvium is not
See alsoeditThe rate of the natural processes of erosion and colluvium accumulation are increased by human induced removal of native vegetation such as on Koh Tao Island in Thailand
- Colluvium filled bedrock hollow
- ^ Jackson, JA, J Mehl, and K Neuendorf 2005 Glossary of Geology American Geological Institute, Alexandria, Virginia 800 pp ISBN 0-922152-76-4
- ^ a b Goodie, AS 2003 Colluvium in A S Goodie, ed, pp 173, Encyclopedia of Geomorphology Volume 1, A–I Routledge, New York, New York 1200 pp
- ^ Anderson, D, and HA Semken 1980 The Cherokee Excavations: Holocene Ecology and Human Adaptations in Northwestern Iowa Academic Press, New York
- ^ Angel JR 1990 Koster site archaeology I: stratigraphy and landscape evolution Research Series vol 8 Center for American Archeology, Kampsville, Illinois
- ^ "colluvium | rock detritus and soil accumulated at the foot of a slope" wwwmerriam-webstercom Retrieved 2015-12-13
- Anonymous 2007 Field Analysis:Is this a colluvial deposit, Soil Analysis Support System for Archaeology, Natural Environment Research Council, United Kingdom
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