place

Prospect dolerite intrusion

Calderas of OceaniaExtinct volcanoesGeology of New South WalesJurassic magmatismJurassic volcanism
LaccolithsLandforms of SydneyLandmarks in SydneyNew South Wales State Heritage RegisterQuarries in AustraliaVolcanoes of New South Wales
Prospect Hill Quarry
Prospect Hill Quarry

The Prospect dolerite intrusion, or Prospect intrusion, is a Jurassic picrite or dolerite laccolith that is situated in Sydney, New South Wales, Australia. Lying in the heart of Cumberland Plain, in the suburb of Pemulwuy (previously Greystanes), the intrusion is Sydney's largest body of igneous rock, rising to a height of 117 metres (384 ft) above sea level. The site is formed by an intrusion of dolerite rock into Ashfield Shale. At least seven different rock types occur in the intrusion. The site was formed from around 200 million years ago when volcanic material (hot magmatic fluids) from the Earth's upper mantle moved upwards and then sideways, which produced many different minerals in the upper part. Also known as Prospect Quarry, the eroded residue of the volcanic core became a quarry of the basalt plug that was carried out from 1820s until the late 2000s, where it contributed most of the crushed rock that were used for building construction and roads in the Sydney area. The intrusion comprises: prospect dolerite and prospect teschenite, in addition to an abundance of coarse grained picrite, olivine and its prehnite specimens.

Excerpt from the Wikipedia article Prospect dolerite intrusion (License: CC BY-SA 3.0, Authors, Images).

Prospect dolerite intrusion
Basalt Road, Sydney Pemulwuy

Geographical coordinates (GPS) Address Nearby Places
placeShow on map

Wikipedia: Prospect dolerite intrusionContinue reading on Wikipedia

Geographical coordinates (GPS)

Latitude Longitude
N -33.825 ° E 150.91805555556 °
placeShow on map

Address

Basalt Road

Basalt Road
2145 Sydney, Pemulwuy
New South Wales, Australia
mapOpen on Google Maps

Prospect Hill Quarry
Prospect Hill Quarry
Share experience

Nearby Places

Prospect Hill (New South Wales)
Prospect Hill (New South Wales)

Prospect Hill, or Marrong Reserve, is a heritage-listed hill in Pemulwuy and Prospect in the greater western region of Sydney, New South Wales, Australia. Situated about 30 kilometres (19 miles) west of central Sydney, the hill is Sydney's largest body of igneous rock and is higher than the ridges of the Cumberland Plain around it, with its present-day highest point being 117 metres (384 feet) high, although before its summit was quarried away it rose to a height of 131 metres (430 feet) above sea level.The site is a former industrial building, agricultural farms, quarry, rural housing, research facility and pastoral property and now industrial building, housing, park, public park, brick quarry and pastoral property. The property is owned by Boral Limited and CSIRO. The site was added to the New South Wales State Heritage Register on 17 October 2003.Prospect Hill is a “nodal point” of the Cumberland Plain. Its summit affords a “goodly prospect” west to the Blue Mountains and east to the man-made landmarks of central Sydney. People have walked round and over Prospect Hill for 30,000 years and have recognised it as a landmark, a meeting place and a boundary. It was known to local people as Mar-rong. For today's Australians it has historic significance, aesthetic values and commercial values. There are extensive industrial and housing developments on its slopes. The hill has a number of summits, with the Main Summit, now within Marrong Reserve, being the most popular for visitors. Oval in shape, the hill has historical significance as one of the first places in the fledgling Colony of New South Wales where liberated convicts were granted land to farm. Furthermore, the settlements on Prospect Hill were a focus of significant antagonism between the indigenous people and the European settlers throughout the 1790s. For over 180 years quarrying of the igneous rock there, mainly teschenite, for roadstone and other building materials has been an important activity. The hill started to form around 200 million years ago when volcanic material from the Earth's core was thrust upwards and then sideways into joints in the layers of Triassic shales of the Cumberland Plain Woodland.