Narrabeen Group

The Narrabeen Group is a geological formation in Australia in the northern Sydney Basin. The Sydney Basin is a sedimentary basin, which extends from the south coast of New South Wales to the central Queensland in Australia. The Sydney Basin is part of a larger geological basin, the Sydney - Gunnedah - Bowen Basin.

Formation

The Narrabeen Group forms a stratigraphic formation towards the end of the Permian to early Triassic. It was formed by sedimentation of rock debris from the areas of New England and of quartz from the basin of the Lachlan, by mingled. The Group consists of clastic quartz and clay-bonded sandstone, conglomerate and shale. Mostly plants, fish and amphibious animals are petrified in these rocks.

The red and green shales of the Narrabeen Group are finally water over the sandstone bodies and the slate of the Bald Hill, which forms the top layer of the Narrabeen Group, forming a regional water blocking layer.

About the Narrabeen Group, the younger stratigraphic formation of the Hawkesbury sandstones in storage on.

The rocks of the Narrabeen Group formed the Three Sisters in the Blue Mountains. The valleys of the Blue Mountains have been formed by erosion and weathering processes that deposited the rock. Furthermore, these rocks also occur at a different location in the Sydney Basin produced, such as the Long Reef at Narrabeen and the Broken Bay out.