Editing Murray River (section)

===Lake Bungunnia===
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Between 2.5 and 0.5 million years ago, the Murray terminated in a vast freshwater lake – Lake Bungunnia – formed by earth movements that blocked the river near [[Swan Reach, South Australia|Swan Reach]]. At its maximum extent, Lake Bungunnia covered {{convert|33000|km2|sqmi|0|abbr=on}}, extending to near the [[Menindee Lakes]] in the north and to near [[Boundary Bend]] in the south.<ref>{{cite web|title=Murray River's natural history dates back 130 million years|url=http://www.murrayriver.com.au/about-the-murray/how-the-murray-river-was-formed/|work=The Murray River is an ancient river, even by the time scale of geologists. Its origins date back about 130 million years ago.|publisher=Discover Murray River|access-date=12 December 2013}}</ref> The draining of Lake Bungunnia occurred approximately 600,000 years ago.<ref>Rogers, P.A. (1995): Continental sediments of the Murray Basin. '''In:''' Drexel, J.F. & Preiss, W.V. (Eds.) The geology of South Australia. Vol.2, The Phanerozoic. p. 252. ''South Australia Geological Survey, Bulletin 54''. {{ISBN|0-7308-0621-9}}</ref>

Deep clays deposited by the lake are evident in cliffs around Chowilla in South Australia. Considerably higher rainfall would have been required to keep such a lake full; the draining of Lake Bungunnia appears to have marked the end of a wet phase in the history of the Murray–Darling Basin and the onset of widespread arid conditions similar to today. A species of ''Neoceratodus'' [[Queensland Lungfish|lungfish]] existed in Lake Bungunnia;<ref>{{cite book  | year = 1990 | title = The Murray | editor1-last= Mackay |editor1-first = Norman | editor2-first = David | editor2-last=Eastburn| publisher = Murray–Darling Basin Commission | location = Canberra | isbn = 1-875209-05-0}}</ref> today ''Neoceratodus'' lungfish are only found in several [[Queensland]] rivers.