Claystone

clay stone

noun Geology.
Also, claystone.


Origin:
1770–80

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Collins
World English Dictionary
claystone (ˈkleɪˌstəʊn)
 
n
a compact very fine-grained rock consisting of consolidated clay particles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
claystone   (klā'stōn')  Pronunciation Key 
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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Encyclopedia Britannica
Encyclopedia

claystone

hardened clay. Some geologists further restrict the term to a sedimentary rock that is composed primarily of clay-sized particles (less than 1256 millimetre in diameter) and is not laminated or easily split into thin layers; such rocks that show cleavage roughly parallel to the bedding plane often are classed as clay shales. Claystones that are massive and blocky are sometimes called mudstones, but some geologists class as mudstones partly hardened muds that slake when wetted, reserving the term claystone for fully hardened material.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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