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Words nearby underclay
Example sentences from the Web for underclay
It rests on the underclay b b', filled with roots of trees in situ, and it supports a growing forest (C D).A Manual of Elementary Geology|Charles Lyell.
These roots were Stigmaria, and the stuff into which they penetrated was an underclay.
I wish Ehrenberg would undertake a microscopical hunt for infusoria in the underclay and shales; it might reveal something.More Letters of Charles Darwin Volume II|Charles Darwin