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clay stone

or claystone

noun, Geology.
Origin of clay stone
1770-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for claystone
Historical Examples
  • Why should the schist pendant of the Tappock chamber be all right, if the claystone pendant of Dunbuie be all wrong?

    The Clyde Mystery Andrew Lang
  • We see them light their claystone pipes, and send forth clouds of blue vapour.

    The Scalp Hunters Mayne Reid
  • But there was more; close by the stone I noticed (although I think you didn't) a mark in the claystone.

    Chronicles of Martin Hewitt Arthur Morrison
British Dictionary definitions for claystone


a compact very fine-grained rock consisting of consolidated clay particles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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claystone in Science
A fine-grained, dark gray to pink sedimentary rock consisting primarily of compacted and hardened clay. Claystone is similar to shale but without laminations.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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