the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > bed of stone or sand (4)
Any of various kinds or beds of stone occurring in quarries. Also in: pendle rock, pendle stone.
a bed in a quarry that may be or has been picked away.
Geology and Mining. A stratum of sand or soft sandstone. oil sand: see oil sand n. at oil, n.1 compounds 5.