Words nearby underclay
How to use underclay in a sentence
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
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.