Bald Rock National Park
Encyclopedia
Bald Rock National Park is a national park
in northern New South Wales
, Australia
, just north of Tenterfield
on the Queensland
border. On the other side of the border the national park continues as the Girraween National Park
.
The park is named after its most prominent feature, Bald Rock, which is a large granite
outcrop rising about 200 metres above the surrounding landscape. Measuring about 750 metres long and 500 metres wide this is the largest granite monolith in Australia. Access to the rock is provided by a sealed road into the park and walking tracks to the summit. Two tracks are marked, a steep one up the exposed face, or an easier gradient through bushland around the back. The summit offers panoramic views of the surrounding bushland, but vegetation on top prevents a full 360° view.
The park is in the New England granite belt
, where about 220 million years ago an episode of granite magma
tism resulted in the intrusion of the Stanthorpe Adamellite into the surrounding metamorphic and sedimentary rock. Subsequent uplift and erosion of the New England Fold Belt
has seen the majority of the surrounding sediments and metamorphic rocks eroded away, with the Stanthorpe Adamellite remaining due to its resistance to weathering.
This regolith
has created a landscape with many exposed inselbergs of granite rocks, some balancing on top of each other, or forming natural arches. The walking track going up the back of Bald Rock leads through such an arch.
Just off the road beside the park is Thunderbolts Hideout, a set of caves and overhanging granite rocks. It was thought to have been used by bushranger
Captain Thunderbolt
.
National park
A national park is a reserve of natural, semi-natural, or developed land that a sovereign state declares or owns. Although individual nations designate their own national parks differently A national park is a reserve of natural, semi-natural, or developed land that a sovereign state declares or...
in northern New South Wales
New South Wales
New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...
, Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
, just north of Tenterfield
Tenterfield, New South Wales
Tenterfield is a town in New South Wales, Australia. It is located in the New England region at the intersection of the New England and Bruxner Highways. Tenterfield is a three-hour drive from Brisbane, 2.5 hours from Byron Bay, two hours from Armidale, New South Wales and 10 hours from Sydney....
on the Queensland
Queensland
Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...
border. On the other side of the border the national park continues as the Girraween National Park
Girraween National Park
Girraween National Park is an area of the Granite Belt in south-east Queensland, Australia reserved as a national park. Girraween is known for its spectacular flowers, dramatic landscapes and unique wildlife. Bushwalking and rock climbing are the most popular activities in the park.-Location:The...
.
The park is named after its most prominent feature, Bald Rock, which is a large granite
Granite
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...
outcrop rising about 200 metres above the surrounding landscape. Measuring about 750 metres long and 500 metres wide this is the largest granite monolith in Australia. Access to the rock is provided by a sealed road into the park and walking tracks to the summit. Two tracks are marked, a steep one up the exposed face, or an easier gradient through bushland around the back. The summit offers panoramic views of the surrounding bushland, but vegetation on top prevents a full 360° view.
The park is in the New England granite belt
Granite Belt, Queensland
The Granite Belt is an area of the Great Dividing Range in south-east Queensland, Australia, centred around the town of Stanthorpe. The cool, high country of the granite belt is found to the south of the Darling Downs and north of the New England Tablelands....
, where about 220 million years ago an episode of granite magma
Magma
Magma is a mixture of molten rock, volatiles and solids that is found beneath the surface of the Earth, and is expected to exist on other terrestrial planets. Besides molten rock, magma may also contain suspended crystals and dissolved gas and sometimes also gas bubbles. Magma often collects in...
tism resulted in the intrusion of the Stanthorpe Adamellite into the surrounding metamorphic and sedimentary rock. Subsequent uplift and erosion of the New England Fold Belt
Orogeny
Orogeny refers to forces and events leading to a severe structural deformation of the Earth's crust due to the engagement of tectonic plates. Response to such engagement results in the formation of long tracts of highly deformed rock called orogens or orogenic belts...
has seen the majority of the surrounding sediments and metamorphic rocks eroded away, with the Stanthorpe Adamellite remaining due to its resistance to weathering.
This regolith
Regolith
Regolith is a layer of loose, heterogeneous material covering solid rock. It includes dust, soil, broken rock, and other related materials and is present on Earth, the Moon, some asteroids, and other terrestrial planets and moons.-Etymology:...
has created a landscape with many exposed inselbergs of granite rocks, some balancing on top of each other, or forming natural arches. The walking track going up the back of Bald Rock leads through such an arch.
Just off the road beside the park is Thunderbolts Hideout, a set of caves and overhanging granite rocks. It was thought to have been used by bushranger
Bushranger
Bushrangers, or bush rangers, originally referred to runaway convicts in the early years of the British settlement of Australia who had the survival skills necessary to use the Australian bush as a refuge to hide from the authorities...
Captain Thunderbolt
Captain Thunderbolt
Frederick Wordsworth Ward was an Australian bushranger renowned for escaping from Cockatoo Island, and also for his reputation as the "gentleman bushranger" and his lengthy survival, being the longest roaming bushranger in Australian history.-Early years:Frederick Ward was the son of convict...
.