The Early Permian Staircase Sandstone Member of the Cattle Creek Formation forms part of the Permo-Triassic basin fill in the Denison Trough (southwest Bowen Basin). The interval is interpreted as the deposits of a wave- and tide-influenced delta because of its interbedded lithological character, alternation of marine and non-marine strata, bipolar palaeocurrent distribution and assemblage of preserved sedimentary structures. The Staircase Sandstone delta prograded eastward into the basin from the northwestern margin, passing distally into progressively more offshore facies.