Early Carboniferous Kanimblan Orogeny (350-325 Ma)
The Bluff, northwestern edge of the Macalister Synclinorium formed during the Kanimblan Orogeny.
The Upper Devonian – Lower Carboniferous red-bed sequences were folded and faulted in the Carboniferous. Age control on this event is very poor within Victoria and the deformation is, by convention, correlated with the Kanimblan “Orogeny” in New South Wales where it is considered to have occurred sometime in the Early Carboniferous. In Victoria the deformation was of somewhat different character in the two main outcrop belts, the Howitt and East Gippsland provinces. In the Howitt Province, Kanimblan structures have formed independently of the pre-existing structures and none of the Tabberabberan structures show Kanimblan offset, not even the Governor Fault. The probable reason is that Kanimblan structures originated as extensional structures during Late Devonian basin formation and were not able to employ pre-existing compressional structures. By contrast in the East Gippsland Province, Kanimblan faults are rejuvenated earlier structures, suggesting that there were no Late Devonian extensional structures available.