Narrabeen Group
The Narrabeen Group is a geological formation in Australia in the northern Sydney Basin . The Sydney Basin is a sedimentary basin that extends from the south coast of New South Wales to central Queensland in Australia. The Sydney Basin is part of a larger geological basin of Sydney - Gunnedah -Bowen Basin.
Emergence
The Narrabeen Group forms a stratigraphic formation towards the end of the Permian to the Early Triassic . It was formed by sedimentation of rock debris from the New England areas and quartz from the Lachlan river basin , which mixed together. The group consists of clastic , quartz and clay-bound sandstones, conglomerate and slate rocks . Plants, fish and amphibious animals are partially fossilized in these rocks .
The red and green slates of the Narrabeen Group seal over the sandstone bodies and the slate of Bald Hill, which forms the uppermost layer of the Narrabeen Group, forms a regional water-blocking layer.
The younger stratigraphic formation of the Hawkesbury sandstones settled over the Narrabeen Group .
The rocks of the Narrabeen Group formed the Three Sisters , in the Blue Mountains . The valleys of the Blue Mountains were formed by the erosion and weathering processes of this deposited rock. These rocks also emerge at various locations in the Sydney Basin, such as on Long Reef near Narrabeen and Broken Bay .
Web links
- The Sydney Basin at australianmuseum.net.au
- NSW Department of Primary Industries - Sydney Basin - Geological Overview
- Sydney Basin at australianmuseum.net.au
- Map and information on ga.gov.au
Individual evidence
- ^ Stratigraphy at australianmuseum.net.au , accessed December 24, 2010
- ↑ Sydney Basin - Geological Overview on dpi.nsw.gov.au , accessed January 24, 2010
- ↑ Geology of the Three Sisters on vnc.qld.edu.au ( Memento of the original from September 16, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed January 24, 2010
