siltstone [silt-stohn] Word Origin noun Petrography.
- a very fine-grained sandstone, mainly consolidated silt.
Origin of siltstone First recorded in 1925–30; silt + stone British Dictionary definitions for siltstone siltstone noun
- a variety of fine sandstone formed from consolidated silt
siltstone in Science 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.