Coobool Creek skeletons morphologically distinct from mid-Holocene and recent Australian Aboriginal skeletons. Linked morphologically to terminal Pleistocene Kow Swamp and Nacurrie series. People taller and more robustly built than mid-Holocene Murray River Aboriginals. Significantly greater mean endocranial volumes than later Aboriginals. Thicker cortical and cranial vault bone than comparative samples. Larger teeth with greater buccolingual crown dimensions. Massive oro-facial skeletons exceeding other Australian samples. Post-Pleistocene reduction in overall cranial size before 5500-4500 BP. Mandibles with greater corpus height, thickness, and ramus breadth than any Australian samples. Crania markedly dolichocephalic with broadly flaring zygomatic arches. Facial skeletons large with broad nasal bones and shallow orbits. Prognathic subnasal region with prominent canine eminences. Maximum palate breadth expands recorded Australian range. Deep glenoid fossae with prominent articular eminences. Maxillary lateral incisors and mandibular second premolars most distinctive for size. Shared artificial cranial deformation with Kow Swamp and Nacurrie.