Encara no tenim significats per a "friable sandstone".
1A ledge of friable sandstone 3½ feet thick lies next below the roof.
2The walls of the canyon are composed of friable sandstone, and are usually vertical.
3Five years after this the exterior of the aisle walls was recased with the same friable sandstone.
4At the point where the descent was steepest there were great naked flats of friable sandstone and conglomerate.
5It is the core, or kernel, of a much larger block of friable sandstone, worn away on all sides by wind and weather.
6Friable sandstone rocks, massive above, stratified below, constitute its enclosing walls.
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