The work was continued, first by E. J. Mason from 1946 to 1949, and then by G. R. Morgan in 1972. Later work led by Edgar Kingsley Tratman explored the human occupation of the Rhinoceros hole, and showed that the fourth chamber of the great cave was a Romano-British cemetery. During excavations in 1954–1957 at Hole Ground, just outside the entrance to the cave, the foundations of a 1st-century hut and Iron Age pottery were seen. These were covered by the foundations of Roman buildings, dating from the 1st to the late 4th century.