1
A ledge of friable sandstone 3½ feet thick lies next below the roof.
2
The walls of the canyon are composed of friable sandstone, and are usually vertical.
3
Five years after this the exterior of the aisle walls was recased with the same friable sandstone.
4
At the point where the descent was steepest there were great naked flats of friable sandstone and conglomerate.
5
It is the core, or kernel, of a much larger block of friable sandstone, worn away on all sides by wind and weather.
6
Friable sandstone rocks, massive above, stratified below, constitute its enclosing walls.