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algific talus slope
Algific talus slopes comprise a very rare, fragile ecosystem and habitat stated to exist only in the Driftless Area of Minnesota, Wisconsin, Illinois, and especially, Iowa.〔(Cliff/Talus System: Southern Floristic Region ), Minnesota Department of Natural Resources, Retrieved July 24, 2007〕 Others suggest, however, that close comparison between similar sites worldwide may enlarge the distribution, or that the term may become restricted to the flora and fauna characteristic of these zones within the Driftless Area.〔(New York Natural Heritage Program ), Retrieved July 24, 2007〕
==Description==
''Algific'' means "cold producing" while "talus slope" refers to a collection of talus or broken rock which rests near the surface it detached from. A related term is maderate cliff, which is an algific slope lacking talus. They were first described in the early 1980s.〔(Driftless Area National Wildlife Refuge Comprehensive Conservation Plan ), United States Fish and Wildlife Service, Retrieved July 24, 2007 (This is very good source, but can take a long time to download)〕 These ecosystems can only exist in regions displaying karst topography.
Algific talus slopes are found mainly on north-facing slopes of ridges and canyons and are characterized by crumbly, heavily fissured, and porous exposed bedrock, with an overburden of talus remaining ''in situ'' from where it detached from its underlying bedrock; it may also display scree, which is talus finding its narrowest angle of repose down-canyon. This is a "unique system involving ridgetop sinkholes and subterranean ice caves; this system also supports Maderate Cliffs."〔 The valleys in which they occur tend to be very steep, and often have dense forest cover.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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