Near the carpark of Mt Williams’ peak, Grampians National Park.
The resulting rocks are in the form of alternating beds of highly resistant quartzose sandstone and layers of less resistant siltstone and mudstone. Subsequent folding of these rocks produced the ranges with sloping sandstone and shale strata, as well as grey granite intrusions. Later erosion has removed much of the shale leaving the more resistant sandstone in asymmetrical ridges, often with steep east-facing escarpments, and with sloping western sides. This formation has been called a cuesta. Fyans Valley, between the Serra Range and the Mt William Range, can be viewed from Boroka Lookout.
From: http://austhrutime.com/grampian_ranges.htm













