Shale: Sedimentary Rock - Pictures, Definition & More - GeologyShale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call "mud." This composition.shale rock fine grained clay sized particles,What Environment Is Likely to Form Siltstone or Shale? | SciencingApr 13, 2018 . Siltstone and shale are sedimentary rocks formed in ancient fresh . in size between the larger grains of sand and the smaller clay particles.
shale rock fine grained clay sized particles