Despite extended periods of exploration in the Perth Basin spanning decades, the timing of fault activity, and shifts in depocentre development remain unclear, especially for intra-basinal faults. Multiple phases of rifting with variable extension directions during the Paleozoic and Mesozoic resulted in a series of predominantly NNW–SSE trending graben and half-graben extending from the Southern Carnarvon Basin in the north, through the Perth Basin in the south. Two regions of greater structural complexity are indicated by gravity and magnetic data along the margin, one of which occurs within the northern Perth Basin and the other between sub-basins of the Southern Carnarvon Basin. Recently acquired seismic surveys that better image the pre-Mesozoic stratigraphy in the northern Perth Basin, paired with legacy seismic and well data have allowed the investigation of fault timing and show a progressive southward shift in fault activity and depocentre location from the late Carboniferous through to the Early Cretaceous, and that some faults, despite having different similar orientations, initiate at different times. Of particular importance is a change in extension direction in the late Triassic and early Jurassic that allowed the development of E-W trending faults.

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