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boulder clay : ウィキペディア英語版 | boulder clay
Boulder clay, in geology, is a deposit of clay, often full of boulders, which is formed out of the ground moraine material of glaciers and ice-sheets wherever they are found. It was the typical deposit of the Glacial Period in northern Europe and North America. ==Names== Boulder clay is also known as till (German: ''Blocklehm, Geschiebemergel'' French: ''argile à blocaux Swedish: ''Moränlera''; Dutch ''Keileem'').
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