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Houdek is a type of soil composed of glacial till and decomposed organic matter. It is found only in the U.S. state of South Dakota where it is the state soil. Houdek topsoil is composed of weathered glacial till and 2% to 4% organic matter which gives it a deep, dark color. The subsoil consists of layers of clay and lime accumulations that were carried downward from the surface by water. Below these layers is the parent material of glacial till. :;Surface layer: Dark grayish brown loam :;Subsoil - upper: Dark grayish brown clay loam :;Subsoil - middle: Grayish brown clay loam :;Subsoil - lower: Light olive brown clay loam :;Substratum: Light yellowish brown clay loam ==See also== *Pedology (soil study) *Soil types *List of U.S. state soils] 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Houdek (soil)」の詳細全文を読む スポンサード リンク
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