Definition of "siltstone" []

• A fine-grained rock of consolidated silt. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Ancient mud deposits harden over geological time to form sedimentary rock such as siltstone or solid, mudrock lutites."
• "We climbed over the craggy outcrops of Cambro-Ordovician age Fort Burnside Formation and Jamestown Formation, crazily tilted beds of phyllite and slate and siltstone and stark white veins of calcite."
• "Anyway, the ground was a very light grey, almost purple in places, a weathered clay or mudstone or siltstone of some sort."