根土岩(root clay) 又称底粘土(underclay)。
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... 砷铋矿 rooseveltite 底土 root clay 褶皱根带 root scar ...
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... 铬铁矿矿床 chromite deposit 根粘土 root clay 更生带 zone of rejuvenation ...
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And the boundary of them has the same lithologic character: the ravinement surface of river course or exposure mudstone of flooding plain and root clay.
二者的界面是相同的，均为河道砂体底部的冲刷侵蚀面或者是暴露过泛滥平原泥岩、根土岩等。
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The region's hard-packed clay soil welcomes a unique mix of plants with deep-penetrating root systems.
WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping
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