The Wianamatta Group is a geological feature of the Sydney Basin, New South Wales, Australia that directly overlies the older (but still Triassic in age) Hawkesbury sandstone. The formation is primarily composed of shales with interbedded lithic sandstones, resulting in generally flat topography as the shales erode.
The Wianamatta Group is a geological feature of the Sydney Basin, New South Wales, Australia that directly overlies the older (but still Triassic in age) Hawkesbury sandstone. The formation is primarily composed of shales with interbedded lithic sandstones, resulting in generally flat topography as the shales erode.
Source: Wikipedia "Wianamatta Group" · CC BY-SA 4.0
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