siltstone
Noun
Meaning
a fine-grained sandstone of consolidated silt
Source: WordNetSynonyms
firestone
bluestone
alabaster
chalk
sandstone
basalt
breccia
brickwork
brownstone
greensand
andesite
bedrock
chert
argillite
marlstone
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Examples
Photo Credit: Peter Rejcek Scientist Erik Gulbranson splits open a grey slab of siltstone in a quarry on Allan Hills to reveal amazingly well-preserved Triassic plant fossils.
Sediment cores — composed of things like glacial rocks, sand, volcanic ash, siltstone and mudstone — represent layers of time millions of years in the past.