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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.
It includes various rock types including lithic sandstone, quartz sandstone, siltstones, claystones, conglomerate and shales, some of which have fossils of plants and fish.
Above the Narrabeen group is the younger less fertile Hawkesbury sandstone. Below are Permian sedimentary rocks including measures of coal broadly known as the Illawarra Coal Measures.
The Narrabeen group is most famously seen as The Three Sisters in the Blue Mountains. It can also be seen in various places in the Sydney Basin, such as Long Reef near Narrabeen, and at sea level around Broken Bay.
==See also==
* Sydney Basin
* Hawkesbury sandstone
* Ashfield Shale
* Wianamatta shale
* Mittagong formation
* Geology of Australia
* Geology of New South Wales
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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