Gunnedah Basin
The Gunnedah Basin (English: Gunnedah Basin ) is part of the larger Sydney-Gunnedah-Bowen Basin , a 15,000 km² large sedimentary basin , which is located in the east of Australia . It originated in the Permian and Triassic . It is partially overlaid by the Surat Basin . It is named after the town of Gunnedah in New South Wales .
geology
The Gunnedah Basin was covered from the Ordovician to the Devonian by the Lachlan Fold Belt strata in the west and from the Devonian by the coal-bearing New England Fold Belt strata in the east. The boundaries between the Gunnedah Basin and the Bowen Basin to the north are fairly indefinite. In the far north of the Gunnedah Basin near Narrabri , the eroded rocks of the early and late Permian are defined as borders. The boundaries between the Gunnedah Basin and the Sydney Basin in the south form the Liverpool Range . The Boggabri Ridge divides the basin into a Maules Creek Sub-basin in the east and the West Gunnedah Sub-basin in the west. The Maules Creek Formation and the Black Jack Formation contain coal and certainly coal seam methane. The deposits of the Maules Creek Formation formed a marine shelf . The upper Black Jack Group was formed by flooding from the New England Fold Belt . Compression and local erosion indicate the end of the Permian sedimentation cycles.
Early Triassic tectonic processes in the New England Fold Belt caused widespread deposition of granular sediments and the Digby Formation formed. The Napperby Formation, which was formed from sediments from rivers, overlaid the Digby Formation and is a result of regression . Jurassic and Cretaceous sediments of the Surat Basin overlaid the Permian-Triassic sequences discordantly in the north and west.
There are large gas and small oil reserves in the Gunnedah Basin. A natural gas pipe was tapped at Wilga Park. In Pilliga Sandstone are oil - and coal deposits .
Web links
Coordinates: 30 ° 54 ′ 0 ″ S , 150 ° 12 ′ 0 ″ E