As nouns the difference between siltstone and claystone
is that siltstone is a sedimentary rock whose composition is intermediate in grain size between the coarser sandstone and the finer mudstone while claystone is (geology) sedimentary rock composed of fine, clay particles.
siltstone
English
Noun
(
wikipedia siltstone)
(
siltstones)
A sedimentary rock whose composition is intermediate in grain size between the coarser sandstone and the finer mudstone.