Mittagong Formation
Stratigraphic range: Triassic

PreЄ

Mount Ku-ring-gai, Australia

Type| Geological formation
Underlies| Ashfield Shale
Overlies| Hawkesbury sandstone
Thickness| up to 10 metres (30 ft)
Location
Location| Sydney Basin
Country| Australia
Type section
Region| Mittagong
Country| Australia
Thickness at type section| 15 metres

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

## Contents

* 1 Formation
* 2 Whereabouts
* 3 See also
* 4 References

## 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

* Narrabeen group

## References

1. ↑ "Australian Museum - The Sydney Basin". http://australianmuseum.net.au/The-Sydney-Basin.
2. ↑ "Geoscience Australia". http://dbforms.ga.gov.au/pls/www/geodx.strat_units.sch_full?wher=stratno=27489.
3. ↑ Field Geology of New South Wales, Sydney Basin page 102
4. ↑ Chris Herbert. Geology of the Sydney 1:100,000 Sheet 9130
5. ↑ "Sydney Turpentine-Ironbark Forest". http://www.environment.gov.au/cgi-bin/sprat/public/publicshowcommunity.pl?id=38.

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Mittagong Formation. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Earth:Mittagong_Formation&oldid=1021584"