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clay stone

noun, Geology
1.
Also, claystone.
Origin of clay stone
1770-1780
1770-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for claystone

claystone

/ˈkleɪˌstəʊn/
noun
1.
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
claystone
  (klā'stōn')   
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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