The stratigraphic development of the Yass Basin, New South Wales
Five groups, previously known as the Yass Laidlaw, and Hume Series (Brown, 1941), are recognised in the Yass Basin succession. They are, in order of oldest to youngest, the Yass, Hattons Corner, Booroo Ponds, Barambogie, and Downing Groups. The Yass Group, of earliest Ludlovian age, consists of mainly terrestrial sandstones and mudstones (O'Briens Creek Sandstone) overlain by supratidal-subtidal limestones (Cliftont~ood Limestone). The Hattons Corner Group comprises thick crystal tuffs...[Show more]
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