Name StatusApproved: NZGB Antarctic CommitteeFeatureIcefallsNZ Gazette Reference2009 (77) p.1803DatumRSRGD2000GeoTag[1] PositionDescriptionIcefalls on the southern side of Midnight Plateau in the Darwin Mountains. They occupy two large cirques and fall about 900 m. Discovered by the Victoria University of Wellington Antarctic Expedition (1962-63). Named after W.M. Prebble, geologist with the expedition.