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Pronunciation varies by accent · noun
A sedimentary rock whose composition is intermediate in grain size between the coarser sandstone and the finer mudstone..
Use siltstone when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Siltstone means A sedimentary rock whose composition is intermediate in grain size between the coarser sandstone and the finer mudstone..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use siltstone where its definition matches the intended context.
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