Silt-stone

siltstone

[silt-stohn]
noun Petrography.
a very fine-grained sandstone, mainly consolidated silt.

Origin:
1925–30; silt + stone

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Collins
World English Dictionary
siltstone (ˈsɪltˌstəʊn)
 
n
a variety of fine sandstone formed from consolidated silt

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
siltstone   (sĭlt'stōn')  Pronunciation Key 
A fine-grained sedimentary rock consisting primarily of compacted and hardened silt. Siltstones are similar to shale but without laminations. They vary in color from black or gray to brown or red.
The American Heritage® Science Dictionary
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