Paleosol
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In geoscience, paleosol is an ancient soil that formed in the past. The definition of the term in geology and paleontology is slightly different from its use in soil science.
Paleosols sequence, Tuscany, Italy
Etched section of paleosol from the Atlantic, San Salvador Island, Bahamas, indicating the top of the Pleistocene Grotto Beach Formation (limestone)
Blocky angular peds in an Eocene paleosol
Granular peds in an Oligocene paleosol
Loess
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Loess is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. Ten percent of Earth's land area is covered by loesses or similar deposits.
Paleosol
…from its use in soil science. In geology and paleontology, a paleosol is a former soil preserved by burial underneath either sediments (alluvium or loess) or volcanic deposits (lava flows or volcanic ash), which in the case of older deposits have lithified into rock. In Quaternary geology, sedimentology…
Loess in Vicksburg, Mississippi, United States
Loess near Hunyuan, Datong, Shanxi, China
Loess from the Rhine lowlands near Mannheim with calcareous concretions
Artist's impression of a scene during the Pleistocene Era. A dust storm in the distance represents a typical cause of present-day loess. (1918 painting by Charles R. Knight)