cryoturbation


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cryoturbation

[¦krī·ō·tər′bā·shən]
(geology)
References in periodicals archive ?
The first vegetation type is characterized by stripped communities here ascribed to the alliance Festucion burnatii, representing xerophilous mountain communities subjected to cryoturbation processes previously described in the highest altitudinal belt of the Picos de Europa (RIVAS-MARTINEZ & al.
Orthels show little or no evidence of cryoturbation.
Turbels show cryoturbation, which appears as irregular, broken, or distorted horizon boundaries, ice wedges, or oriented rock fragments on top of the permafrost.
1997), the name Aquaturbel indicates the recent cryoturbation in these soils.
Gelic soils with evidence of cryoturbation are termed Turbels, and gelic soils with minimal evidence of cryoturbation are classified as Haplels.
Because of the high degree of weathering and cryoturbation of surface sediment, particularly on older beaches, sediment 10 cm beneath the surface was exposed for photography, except where sorted circles brought underlying gravel to the surface.
These are primarily depositional features, and cryoturbation is more limited at this site.
Archaeological levels and stream-laid deposits are locally affected by cryogenic processes such as cryoturbation and frost-cracks (Fig.
The transition zone exhibits the effects of cryoturbation, contains abundant redistributed organic carbon, is enriched by ice in the forms of lenses, veins, and nets (reticulate vein ice) and has abundant soil moisture.
West of the erosion front is a treeless area, recently colonized with sparse alpine tundra, which showed evidence of strong cryoturbation (needle ice, frost heave, mud boils) and wind deflation of the topsoil.
However, it is impossible to determine if this tentative Northern Archaic occupation is, in fact, associated with the microblades until we ascertain the extent to which cryoturbation and bioturbation may have affected the upper part of the site (e.
Apparently the remains of walruses that crawl inland and die are less subject to being scattered than are those that die on the shore or at sea, apart from the minor effects of solifluction and cryoturbation.