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The Permo-Triassic Sydney basin is located between a craton to the west and a volcanic source to the east. Systematic variations in sandstone composition, both in space and time, are characteristic patterns in the Sydney basin. A sharp change in sandstone composition is observed in the Late Permian from a quartzo-feldspathic subarkose to volcanic arenite. This change is attributed to the syndepositional development of a volcanic source along the eastern margin of the basin. Throughout the latter part of the Late Permian until Early Triassic time, the sediments were primarily derived from the volcanic source with a secondary mode from...

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