Cinder-bed, a name given by the quarrymen to a stratum of the Middle Purbeck series of the Jurassic system, almost entirely composed of the aggregated shells of a small oyster (Ostrea distorta).
Cinder-bed
Chambers's Encyclopaedia, Volume 3: Catarrh to Dion, p. 255
Source scan(s): p. 0266