Mittagong_Formation

Mittagong Formation

Mittagong Formation

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The Mittagong Formation is a sedimentary rock unit in the Sydney Basin in eastern Australia.[1]

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Formation

Laid down in the Triassic Period, it may be seen as an interval of interbedded fine-grained sandstone and shale between the Ashfield Shale (above) and the Hawkesbury sandstone (below). The maximum thickness around Sydney may be ten metres.[2] Near Town Hall railway station, the formation is 8 metres thick. In the type area at Mittagong it is 15 metres thick.

Whereabouts

In northern Sydney it can be seen in several areas, such as West Pymble[3] and Mount Ku-ring-gai.[4] This rock formation is associated with the critically endangered Sydney Turpentine-Ironbark Forest.[5]

See also

References

  1. [1]
    "Australian Museum - The Sydney Basin".
  2. [2]
    "Geoscience Australia".
  3. [3]
    Field Geology of New South Wales, Sydney Basin page 102
  4. [4]
    Chris Herbert. Geology of the Sydney 1:100,000 Sheet 9130
  5. [5]
    "Sydney Turpentine-Ironbark Forest".


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