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26 Δεκ 2021 · • ice-contact stratified drift: deposited in direct contact with, or at least in the immediate proximity, of, glacier ice, active or inactive. • proglacial drift: drift that is carried out well beyond the glacier terminus by flowing water.
Stratified drift refers to sediment that has been deposited by glacial meltwater in distinct layers or strata. This type of deposit often contains a mix of materials, including sand, gravel, and silt, which are sorted by the flow of the water as it transports the sediment away from the glacier.
Drift is often subdivided into (unsorted and) unstratified drift (glacial till) that forms moraines and stratified drift (glaciolacustrine and fluvioglacial sediments) that accumulates as stratified and sorted sediments in the form of outwash plains, eskers, kames, varves, and so forth.
Glacial drift refers to the method of locating potentially economic mineralization by tracing the source of mineralized material that was carried by a glacier and deposited in a moraine when the glacier melted.
Ecological drift causes species abundances to fluctuate randomly, lowering diversity within communities and increasing differences among otherwise equivalent communities. Despite broad interest in ...
5 Μαΐ 2017 · Ecological drift causes species abundances to fluctuate randomly, lowering diversity within communities and increasing differences among otherwise equivalent communities. Despite broad interest in ecological drift, ecologists have little experimental evidence of its consequences in nature, where competitive forces modulate species abundances.
From: stratified drift in A Dictionary of Environment and Conservation » Subjects: Science and technology — Environmental Science. Well‐sorted layers of sand and gravel that have been deposited by glacial meltwater.
