St Michaels Cave (Avalon Beach)
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St Michaels Cave is situated in the
Sydney Sydney ( ) is the capital city of the state of New South Wales, and the most populous city in both Australia and Oceania. Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about towards the Blue Mountain ...
suburb of
Avalon Beach Avalon Beach is a northern beachside suburb of Sydney, in the state of New South Wales, Australia. It is 37 kilometres north of the Sydney central business district, in the local government area of Northern Beaches Council, in the Northern Beache ...
. This sea-side cave is around 110 metres long, 15 metres high and 10 metres wide. The original colonial owner was a
Reverend The Reverend is an style (manner of address), honorific style most often placed before the names of Christian clergy and Minister of religion, ministers. There are sometimes differences in the way the style is used in different countries and c ...
John Therry, who planned to deliver lectures within the cave and build a church above it. The cave was formed by the erosion of a
jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...
dyke through triassic sedimentary rocks. The cave is known to be a breeding site for
Common bent-wing bat The common bent-wing bat (''Miniopterus schreibersii''), also known as the Schreibers's long-fingered bat or Schreibers's bat, is a species of insectivorous bat. They appear to have dispersed from a subtropical origin and distributed throughout ...
s and Large-eared pied bats.


See also

*
Sydney Basin The Sydney Basin is an interim Australian bioregion and is both a structural entity and a depositional area, now preserved on the east coast of New South Wales, Australia and with some of its eastern side now subsided beneath the Tasman Sea. ...
*
Newport Formation (NSW) The Newport Formation is a geologic formation outcropping in the Sydney Basin in eastern Australia. This stratum is up to 49 metres thick. Formed in the mid-Triassic, it is part of the Narrabeen Group of sedimentary rocks. See also * Sydney ...
*
Bald Hill Claystone Bald Hill Claystone is a sedimentary rock found in the Sydney Basin in eastern Australia. It is part of the Clifton sub-group of the Narrabeen Group of sedimentary rocks. It was formed by weathering of the Gerringong Volcanics in the early Triass ...
*
Narrabeen group The Narrabeen group of sedimentary rocks occurs in the Sydney Basin in eastern Australia. This series of rocks was formed in the Triassic Period. Geology It includes various rock types including lithic sandstone, quartz sandstone, siltstones, ...


References

Geology of New South Wales Caves of New South Wales {{Australia-geology-stub