The Darling Basin, located in the northern part of the Lachlan Orogen, is cut by the 1000km long east-northeast-trending Darling Lineament (Fault) which intersects the Koonenberry Fault to the north and the Mt Wintlow High (fault) to the south. During the Lachlan Orogeny these faults formed the Darling Basin Conjugate Fault System (DBCFS) in which the four sectors (NW, NE, SE, SW) showed alternate compression/uplift, and tension/subsidence. The DBCFS underwent five phases of development. During orogenic Phase 5, the northeast sector was in compression, and thick distal braidplains, deposited during orogenic Phase 4, when the sector was in tension, and underlying the older strata, were deformed. The study area has a 4-10km wide concave northeast-facing fault zone, largely comprising, dextral faults, which is consistent with some tectonic transport of the fault blocks of the zone, largely to the southwest. Faulting followed an earlier period of east-west and southeast-northwest folding. This structure overprints unexposed strata deposited during orogenic phases 1, 2 and 4 in the Lachlan Orogeny as well as pre-Late Ordovician structure (Delamerian Orogeny).
