Chain gravel - Chain gravel
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Also called rotten gravel. Gravel that has been weathered so much that it can be easily broken down by hand or a shovel. It is common in the gravel that makes up high terraces throughout Japan. It is thought to be the result of repeated weathering during the many humid and warm periods that occurred in the early to middle Quaternary Period. Source : Heibonsha Encyclopedia About MyPedia Information |
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くされ礫とも。手やスコップで容易に崩れるほど強く風化した礫。日本各地の高位段丘の構成礫に多い。第四紀前〜中期にいくどもあった湿潤温暖な時期に，繰り返して風化作用を受けた結果と考えられる。
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