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Mittagong Formation : ウィキペディア英語版 | Mittagong Formation
The Mittagong Formation is a type of sedimentary rock occurring in the Sydney Basin in eastern Australia. Formed in the Triassic Period. It may be seen as a narrow band of fine grained sandstone between the Wianamatta shale (above) and the Hawkesbury sandstone (below). The maximum thickness is ten metres. Near Town Hall railway station, the formation is 8 metres thick. In northern Sydney it can be seen in a few areas, such as West Pymble〔Field Geology of New South Wales, Sydney Basin page 102〕 and Mount Ku-ring-gai.〔Chris Herbert. Geology of the Sydney 1:100,000 Sheet 9130〕 This rock formation is associated with the critically endangered Sydney Turpentine-Ironbark Forest. ==See also==
*Narrabeen group.
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