Siltstone
noun, Petrography.
1.
a very fine-grained sandstone, mainly consolidated silt.
noun
1.
a variety of fine sandstone formed from consolidated silt
siltstone
(sĭlt’stōn’)
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.
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