I am definitely not a geologist, but there is something rather cool about the fact that a waterfall can be in one place in one era and can then wind up a couple of kilometres upstream the next. Or, in the case of the Lal Lal and Moorabool Falls, can end up in two different places on two separate waterways.
|Confluence of the Moorabool River West Branch and Lal lal Creek at the|
top of Bungal Dam
My last post described how the Lal Lal Falls have been busily migrating up the creek, cutting through the relatively recent basalt lava flows of the last few tens of thousands of years. Meanwhile, over on the West Moorabool, the Moorabool Falls were busy making progress of their own, working their way through a different part of the same basalt flow.
|Granite Falls, a series of cascades which flow over granite remains about|
400m up the Moorabool West Branch from its confluence with Lal Lal Creek
|Moorabool Falls, April 2012|
In the case of the Lal Lal and Moorabool Falls, headward erosion began at a single knickpoint below the junction of Lal Lal Creek and the Moorabool West Branch. Over time and as the erosion reached the confluence of the two streams, the single waterfall, divided into two and the erosion continued up both branches. That which occurred in Lal Lal Creek has so far moved over 1,600m to the present site of the falls, whilst the erosion of the West Moorabool has traveled some 1,400m upstream to where the Moorabool Falls are now.
|Moorabool West Branch just below Moorabool Falls|
|West Moorabool between Moorabool Falls and Bungal Dam|
I have never seen a Bush Stone-curlew, nor do I know if they were ever found on the banks of the Moorabool River.