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The Sydney Basin is both a structural (deformed saucer-like) 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 ocean. It has also lost area on its western side by erosion. Confusion may arise because geologists use the term "Basin" both to mean an area in which deposition is occurring and at other time to mean the rocks formed by that deposition - which are slightly different 'takes' on the matter. The Sydney Basin consists of Permian and Triassic sedimentary rocks. It is named for the city of Sydney which is centred within it and 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 and Wollongong, 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. ==Geography== Definitions of the boundaries and what comprises the Sydney basin vary significantly. The Australian Government classifies the basin as an interim Australian bioregion consisting of . 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.〔(【引用サイトリンク】title=Sydney Basin Structure Diagram )〕 The total area of the basin is approximately onshore plus offshore.〔(【引用サイトリンク】title=Development of the Sydney Basin )〕 The centre of the basin is located around west of the Sydney central business district at Fairfield.〔(【引用サイトリンク】title=Sydney Basin - Geological Overview )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sydney Basin」の詳細全文を読む スポンサード リンク
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