Second trip to end of Mullamullang.. Chistmas Day 1967. N37 Red Album p138

Then the longest cave in Australia, discovered on SUSS Nullarbor expedition 1963-64. 3 miles to the end with 6 miles of passages mapped. see... www.caves.org.au/helictite/abstracts0.html To quote Glenn............................ Title: The Origin and Development of Mullamullang Cave N37, Nullarbor Plain, Western Australia Authors: Hunt, G.S. Published: 1970, Helictite 8(1):3-21 Abstract by author: Mullamullang Cave N37 is the longest and most complex cave on the Nullarbor Plain, Southern Australia. Unlike the other caves, it possesses extensive levels of phreatic solution tube passages which permit stronger inferences to be made on the development of the collapse passages constituting the bulk of Mullamullang Cave and other deep Nullarbor caves. These passages have been formed by collapse through overlying belts of solution tube networks along an elongated zone of cavitation in the limestone. Massive breakdown was probably initiated at depth within the zone, at least 50 feet below the present watertable level. Upward stoping of the collapse would have been facilitated by the higher network levels in the zone, such as the Ezam and Easter Extension. Channelling of groundwater flow under the Plain is suggested by the belt-like nature of the networks. An epiphreatic origin is proposed for the network levels though convincing morphological evidence is wanting. Eustatic changes in sea level have been of fundamental importance in the development of the multiple levels. Wetter periods in the past were probably important as little development is taking place under present-day dry conditions. Correlation of wetter periods with Pleistocene glacials would help explain the development of huge collapse passages, but such correlatien cannot be assumed on present evidence. Massive collapse and doline formation were followed by subaerial weathering and vadose activity which modified the cave - especially near the entrance. Correlation of levels in Mullamullang with those in other Nullarbor deep caves is attempted. However, Mullamullang Cave is unique probably due to the lithology of the Abrakurrie Limestone in which it is developed. Includes: 6 photos, 36 refs search for other N37 images on Flickr 117 views prior to chat with John today 2-5-09 See the Australian Geographic Story on Caves of the Nullarbor.. www.australiangeographic.com.au/travel/destinations/2016/...