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mudstone

[muhd-stohn] /ˈmʌdˌstoʊn/
noun, Geology
1.
a clayey rock with the texture and composition of shale but little or no lamination.
Origin of mudstone
1730-1740
1730-40; mud + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mud-stone

mudstone

/ˈmʌdˌstəʊn/
noun
1.
a dark grey clay rock similar to shale but with the lamination less well developed
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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mud-stone in Science
mudstone
  (mŭd'stōn')   
A fine-grained, dark gray sedimentary rock consisting primarily of compacted and hardened silt and clay, similar to shale but without laminations. The proportions of silt and clay in mudstone are approximately equal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
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