
In USDA soil taxonomy, entisols are defined as soils that do not show any profile development other than an A horizon. An entisol has no diagnostic horizons, and most are basically unaltered from their parent material, which can be unconsolidated sediment or rock. Entisols are the second most abundant soil order (after inceptisols), occupying abou...
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http://en.wikipedia.org/wiki/Entisol

one of the 12 soil orders in the U.S. Soil Taxonomy. Entisols are soils defined by the absence or near absence of horizons (layers) that clearly ... [1 related articles]
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http://www.britannica.com/eb/a-z/e/34

a fertile soil of recent origin that is distinguished by a lack of horizons and is found worldwide in all climates.
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https://www.infoplease.com/dictionary/entisol
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