The Upper Paleozoic Carbonate-Detrital Assemblage represents Mississippian through Permian sediments deposited within the foreland basin extending east of the Antler "highland". This Antler foreland was created during tectonic loading and down-flexing of the continental crust by the Roberts Mountains allochthon. Within the foreland basin coarse clastics such as the Diamond Peak, Moleen and Tomera, Carbon Ridge and Garden Valley Formations are interfingered with bank and platform carbonates such as the Joana and Ely Limestones. Permian lithologies deposited within several small shallow water marine basins separated by locally emergent arches are included with this assemblage.