Geology of the Inglis Dome, Denison Trough, central Queensland

The Inglis Dome is an anticlinal structure located in the Denison Trough on the western side of the Bowen Basin, east central Queensland. Approximately 4000 m of Permian sediments accumulated in this area during several transgressive and regressive phases. In ascending order, the exposed Permian units comprise: the upper conglomerate member of the Aldebaran Sandstone, Freitag Formation, Ingelara Formation, Catherine Sandstone, Peawaddy Formation, Black Alley Shale and Bandanna Formation. Subsurface units include the Reids Dome beds. Cattle Creek Formation and the lower sandstone member of the Aldebaran Sandstone. Sediments are inferred to be largely derived from the Devonian-Carboniferous Drummond Basin and Cambrian-Ordovician Anakie Inlier to the west and northwest. The Inglis Dome, initiated during Late Triassic regional deformation, developed by up-arching of sediments through reactivation and reversal of movement along normal dip-slip basement faults that dated from Early Permian times.Palynological investigation of part of the Middle Permian sequence reveals that previous correlations of the Denison Trough formations with the Permian Upper 5b and Upper 5c palynostratigraphic interval zones require revision. Megafloral and palynofloral investigations reveal that a Glossopteris-rich, cool temperate flora existed in the vicinity of the project area during the Middle Permian.