Herbert E. Balch continued the work from 1904 to 1914, when he led excavations of the entrance passage (1904–1915), Witch's Kitchen (the first chamber) and Hell's Ladder (1926–1927) and the Badger Hole (1938–1954), where Roman coins from the 3rd century were discovered along with Aurignacian flint implements. Rhinoceros Hole was scheduled as an ancient monument in 1992. The 1911 work found of stratification, mostly dating from the Iron Age and sealed into place by Romano-British artefacts. Finds included a silver coin of Marcia (124 BC), pottery, weapons and tools, bronze ornaments, and Roman coins from Vespasian to Valentinian II (1st to 4th centuries).