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Concept
Sydney Basin
Summary
The Sydney Basin is an interim Australian bioregion and is both a structural entity and a depositional area, now preserved on the east coast of New South Wales, Australia and with some of its eastern side now subsided beneath the Tasman Sea. The basin is named for the city of Sydney, on which it is centred.
Around thick, the Sydney Basin consists of Permian and Triassic sedimentary rocks, which stretches from Newcastle in the north to Batemans Bay in the south, and west to the Great Dividing Range. The basin is also home to the major centres of Newcastle, Gosford and Wollongong, as well as the state capital of Sydney, and contains economically significant reserves of coal.
Sydney's famous harbour and the sculptured cliffs of the Blue Mountains are signature formations of relatively hard upper strata of sandstone. The basin contains the UNESCO World Heritage-listed Greater Blue Mountains Area.
According to NSW Primary Industries, the basin extends through approximately of coastline from Newcastle in the north to Durras Lake (near Batemans Bay) in the south. From Durras Lake the western boundary continues in a line through Lithgow to around Ulan (near Mudgee). To the north the boundary extends along the Liverpool Range to a point north of Muswellbrook, and then runs back to the coast at Newcastle. To the east the basin continues to the edge of the continental shelf.
The total area of the basin is approximately onshore plus offshore. The centre of the basin is located around west of the Sydney central business district at Fairfield, though only the youngest Triassic (middle Triassic) rocks are exposed in the Sydney area.
The Australian Government Department of Agriculture, Water and the Environment classifies the basin as an interim Australian bioregion consisting of . Meanwhile, according to Geoscience Australia the basin covers , of which is onshore and is offshore with water depths of up to . Another Australian Government agency classifies that the basin covers approximately .
Official source
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