Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock Particle size . Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust .... prevalent in the Sydney
Sydney
Sydney is the List of cities in Australia by population in Australia, with a metropolitan area population of approximately 4.34 million . It is the List of Australian capital cities of New South Wales, and was the site of the first British Empire colony in Australia.... region of New South Wales
New South Wales
New South Wales is Australia's oldest and most populous States and territories of Australia, located in the south-east of the country, north of Victoria and south of Queensland.... , Australia
Australia
Australia, officially the Commonwealth of Australia, is a country in the southern hemisphere comprising the Australia of the world's smallest continent, the major island of Tasmania, and numerous list of islands of Australia in the Indian Ocean and Pacific Oceans.... . It dates from the Triassic Period. Well known for its durable quality, it is the reason many Aboriginal rock carvings and drawings in the area still exist. Named after the Hawkesbury River
Hawkesbury River
The Hawkesbury River, also known as Deerubbun, is one of the major rivers of the coastal region of New South Wales, Australia. The Hawkesbury River and its tributaries virtually encircle the metropolitan region of Sydney.... north of Sydney, where this sandstone is particularly common. The Hawkesbury Sandstone is the caprock
Caprock
The Caprock is a region in the Texas Panhandle of Texas . It is the land to the west of the Caprock Escarpment, which separates it from plains stretching to the east at a much lower elevation.... which controls the erosion and scarp retreat of the Illawarra escarpment
Illawarra escarpment
The Illawarra Escarpment is the fold created cliffs and plateau/ eroded outcrop mountain range west of the Illawarra coastal plain south of Sydney, Australia, enclosing the region known as the Illawarra which stretches from Stanwell Park, New South Wales in the north to Kiama, New South Wales, Gerringong, New South Wales and the Shoalhaven... .
Other rock types found in Sydney include Narrabeen shale and the younger Wianamatta shale
Wianamatta shale
Wianamatta shale is a type of shale prevalent in the Sydney region of New South Wales, Australia. It dates from the Triassic Period. It produces a rich clayey soil, often with poor drainage, such as that in the Cumberland Plain.... .
