d64a771a-559a-48f8-93e1-8fece37bbbec urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T11:37:43 creation ISO 19115 2016 Notes on the Calvert Hills 4-mile geological sheet d64a771a-559a-48f8-93e1-8fece37bbbec A basement of Precambrian volcanic and granitic rocks is overlain by two sequences of shallow-water sedimentary rocks regarded as of Upper Proterozoic age, and by a sequence of terrestrial and paludal or lacustrine sedimentary rocks of Upper Jurassic to Lower Cretaceous age. The older Upper Proterozoic sequence contains volcanics and intrusives and has been moderately folded. The younger Upper Proterozoic sequence has been weakly folded. Remnants of Miocene (?) laterite occur near the headwaters and on the interfluves of streams flowing towards the Gulf of Carpentaria. Faults (both normal and transcurrent) and joints with a dominant north-west trend are numerous. The most prominent fault, the Calvert Hills fault is transcurrent, quartz-filled in places, and trends north-west across the sheet. The Precambrian basement rocks contain small deposits of uranium, copper, tin and gold. The older sequence of Upper Proterozoic rocks contains small deposits of uranium and copper. The younger sequence contains small deposits of copper and manganese. Some of the sedimentary rocks are aquifers and would supply adequate quantities of bore water for stock. Two second order relief forms occur; one the dissected country drained by streams flowing to the Gulf of Carpentaria, the other the tableland country drained by streams flowing into an internal drainage basin. Fossil erosion surfaces are present in the area. Some land-forms are controlled by structure. Earth Sciences GA Publication Published_External Record geology Download the Record (pdf) documentDigital Download the Record (pdf) PDF Unnamed resource documentDigital HTML