mud-stone

mudstone

[muhd-stohn]
noun Geology.
a clayey rock with the texture and composition of shale but little or no lamination.

Origin:
1730–40; mud + stone

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Collins
World English Dictionary
mudstone (ˈmʌdˌstəʊn)
 
n
a dark grey clay rock similar to shale but with the lamination less well developed

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
mudstone   (mŭd'stōn')  Pronunciation Key 
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
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