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Aeolian processes are those processes of erosion, transport, and deposition of sediments that are caused by wind at or near the surface of the earth. [1] Sediment deposits produced by the action of wind and the sedimentary structures characteristic of these deposits are also described as aeolian.
Lag deposit: Angular rocks and sand grains that have been left behind during the gradual removal of finer particles by aeolian processes. Lag deposits can also form due to removal of finer particles by water. Yardangs: A protruding rock that results from a streamlined carving from consolidated material by wind abrasion by dust and sand, and ...
The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2]
Eolianite or aeolianite is any rock formed by the lithification of sediment deposited by aeolian processes; that is, the wind. In common use, however, the term refers specifically to the most common form of eolianite: coastal limestone consisting of carbonate sediment of shallow marine biogenic origin, formed into coastal dunes by the wind, and ...
Cross-bedding in lithified aeolian sand dunes preserved as sandstone in Zion National Park, Utah. A lithified (consolidated) sand dune is a type of sandstone that is formed when a marine or aeolian sand dune becomes compacted and hardened. Once in this form, water passing through the rock can carry and deposit minerals, which can alter the ...
A diagram of various depositional environments. In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record.
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