The South Nicholson Basin is a basin straddling the Queensland-Northern Territory border, south of the above provinces. The Savannah Province on Cape York initially formed around 1585 to 1550 Mya as sediments, but are now converted to slate, phyllite, schist, gneiss and quartzite. They were intruded bydolerite and amphibolite. The Etheridge Province lies to the east. It started as a rift in the continent, between 1700 and 1650 Mya. This was deformed and intruded with granite and metamorphosed at 1550 Mya. The Croydon Province contains the Croydon Volcanic Group of acid volcanids, the Esmeralda Supersuite granite, and quartz rich sediments of the Inorunie Group. The relatively shallow Eromanga Sea was an inland sea that covered large parts of Queensland and Central Australia at least four times during the early Cretaceous. The Winton Formation represent remnants of the river plains that filled the basin left by the Eromanga Sea. The formation is a major source of dinosaur fossils. The Toolebuc Formation which contains strata dating back to the early Cretaceous and is partly located in Queensland and the Northern Territory. Stretching of the continental crust of the New England Orogen in the Permian period formed the Bowen-Gunnedah-Sydney Basin System. This was a foreland basin from Permian into the Triassic. Granites from this time also intruded. From middle to Late Triassic an ocean arc collided. This folded and trusted the surface contents of the basin starting in the east extending to the west. The North Queensland Orogen is also denotated by the North Lachlan Orogen. The northernmost part is called the Hodgekinson Fold Belt. The North Queensland Highlands is a physiographic region in northern Queensland. It includes the Chillagoe Belt, Normanby Platform, Atherton Tableland, Mount Emu Lava Plains and the Cairns Littoral. The Bowen Basin is partly overlaid by the Surat Basin. The basin contains the largest coal reserves in Australia. Open cut and underground coal mines are located in the north of the basin. Ports at Hay Point, Queensland and Gladstone provide access for coal to export markets. In the Denison Trough in the west of the basin contraction has generated a range of geometries. The Jurassic to Cretaceous Clarence Moreton Basin is found in South East Queensland across the border to New South Wales.