Cross Lamina
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A type of sedimentary structure. The upper and lower laminae are not parallel, but cross each other at an angle. This occurs because the strength and direction of the wind and water currents that transport the sediments often change. This is particularly noticeable in sand dunes, rivers, and shallow sea deposits. It is used to determine the top and bottom of strata and the direction of transport of debris. Source : Heibonsha Encyclopedia About MyPedia Information |
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堆積構造の一種。上下の葉理（ラミナ）が平行でなく，互いに斜交する現象。堆積物を運搬する風や水流の強さや方向がしばしば変化したために生じる。砂丘，川，浅海の堆積物中に特に著しい。地層の上下の判定や砕屑(さいせつ)物の運搬方向の決定などに利用される。
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