siltstone

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

Origin:
1925–30; silt + stone

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When deposits of silt are compressed and the grains are pressed together, rocks such as siltstone form.
Commonly cliff-forming, cross-bedded sandstone lenses alternating with slope-forming siltstone, mudstone and shale.
The left abutment and spillway are founded on weathered siltstone bedrock and alluvial deposits.
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