Rock
A clastic sedimentary rock made of sand-sized grains cemented together. Its grains are fragments of older rock, so a sandstone carries a record of a landscape that no longer exists.
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Clastic sedimentary rocks are named by grain size: shale is made mostly of clay, siltstone of silt-sized grains, sandstone of sand-sized clasts, and conglomerate of pebbles set in a matrix of sand or mud.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Geological Survey n.d. Primary authority
A sandstone can contain the same minerals as a granite — quartz, feldspar and mica — but as grains compacted and cemented into one another rather than interlocked crystals.
Evidence support: Supported by the cited evidence one source
Evidence: British Geological Survey n.d. Primary authority
Record last updated 2026-09-06. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.