Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• What was the former name of the Prospect dolerite intrusion site?: The site was formerly known as Prospect Quarry. It served as a significant source of crushed rock for Sydney's development from the 1820s until the late 2000s.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.

Related Concepts:

• When did the igneous activity that formed the Prospect dolerite intrusion occur?: The igneous activity that shaped the Prospect dolerite intrusion took place in the Early Jurassic period, approximately 200 million years ago. This period was characterized by significant volcanic activity in the Sydney Basin.

Related Concepts:

• How did the Prospect dolerite intrusion form?: It formed when hot magmatic fluids from the Earth's upper mantle moved upwards and sideways, intruding into the Ashfield Shale and Sydney sandstone. This process created a laccolith, a mushroom-shaped igneous body.
• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.
• What geological process is implied by the term teschenite in relation to the intrusion?: Teschenite is a type of alkaline dolerite, indicating that the magma involved in the intrusion was relatively rich in alkali feldspars and feldspathoids. The Prospect intrusion is described as a circular teschenite encroachment.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.
• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.
• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.

Related Concepts:

• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.
• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.

Related Concepts:

• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What was the former name of the Prospect dolerite intrusion site?: The site was formerly known as Prospect Quarry. It served as a significant source of crushed rock for Sydney's development from the 1820s until the late 2000s.
• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.
• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.

Related Concepts:

• What was the former name of the Prospect dolerite intrusion site?: The site was formerly known as Prospect Quarry. It served as a significant source of crushed rock for Sydney's development from the 1820s until the late 2000s.
• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.

Related Concepts:

• What is a laccolith, and how does the Prospect intrusion fit this description?: A laccolith is an igneous intrusion that has a relatively flat lower surface and a dome-shaped upper surface, formed when magma pushes up the overlying rock layers. The Prospect intrusion is described as a doleritic laccolith, although quarrying has altered its original concave upper surface.

Related Concepts:

• What is the significance of the analcime found at the intrusion's top?: The abundant analcime at the intrusion's top indicates a significant retention of magmatic water during the crystallization process. This water played a role in the formation of the diverse rock types and minerals found there.

Related Concepts:

• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.

Related Concepts:

• What minerals are listed as being present in the Prospect dolerite intrusion?: The intrusion contains a wide array of minerals, including albite-anorthite series, analcime, apatite, apophyllite, aragonite, augite, calcite, chalcedony, feldspar group, gold, ilmenite, olivine, opal, quartz, and pyrite, among many others. This diverse mineralogy is a result of complex geological processes.

Related Concepts:

• What is the geological term for the rock that underlies the Prospect dolerite intrusion?: The intrusion is situated within the Ashfield Shale and Sydney sandstone. Specifically, it intruded the Triassic Wianamatta shale, with the Ashfield Shale and Sydney sandstone being mentioned as formations it overlies.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.

Related Concepts:

• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.
• What is the relationship between the Prospect dolerite intrusion and the Sydney Basin?: The Prospect dolerite intrusion is one of several Mesozoic intrusions found within the Sydney Basin. It formed at the junction of the Triassic Sydney sandstone and the Ashfield Shale, which are key geological units of the basin.

Related Concepts:

• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• What was the former name of the Prospect dolerite intrusion site?: The site was formerly known as Prospect Quarry. It served as a significant source of crushed rock for Sydney's development from the 1820s until the late 2000s.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.

Related Concepts:

• What minerals are listed as being present in the Prospect dolerite intrusion?: The intrusion contains a wide array of minerals, including albite-anorthite series, analcime, apatite, apophyllite, aragonite, augite, calcite, chalcedony, feldspar group, gold, ilmenite, olivine, opal, quartz, and pyrite, among many others. This diverse mineralogy is a result of complex geological processes.

Related Concepts:

• What is the geological term for the rock that underlies the Prospect dolerite intrusion?: The intrusion is situated within the Ashfield Shale and Sydney sandstone. Specifically, it intruded the Triassic Wianamatta shale, with the Ashfield Shale and Sydney sandstone being mentioned as formations it overlies.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.

Related Concepts:

• What was the former name of the Prospect dolerite intrusion site?: The site was formerly known as Prospect Quarry. It served as a significant source of crushed rock for Sydney's development from the 1820s until the late 2000s.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.

Related Concepts:

• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Where is the Prospect dolerite intrusion situated within Sydney?: The intrusion is located in the heart of the Cumberland Plain, specifically in the suburb of Pemulwuy, which was formerly known as Greystanes. It is a prominent geological feature in western Sydney.

Related Concepts:

Related Concepts:

• What is the geological term for the rock that underlies the Prospect dolerite intrusion?: The intrusion is situated within the Ashfield Shale and Sydney sandstone. Specifically, it intruded the Triassic Wianamatta shale, with the Ashfield Shale and Sydney sandstone being mentioned as formations it overlies.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.
• What does the text suggest about the potential for gold at the site?: The text mentions that a small amount of gold was observed in a sample test in the 1960s, but no further discoveries have been made since. This suggests a minor, localized occurrence rather than a significant gold deposit.

Related Concepts:

• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What is the stratigraphic range of the Prospect dolerite intrusion?: The Prospect dolerite intrusion dates back to the Early Jurassic or Middle Jurassic period. These geological periods are part of the Mesozoic Era.

Related Concepts:

• What is the significance of the Prospect dolerite intrusion being listed on the NSW State Heritage Register?: Its inclusion signifies its recognition as a place of state importance, valued for its unique geological landscape, potential archaeological value, and its connection to significant historical periods in New South Wales. This listing helps protect the site for future generations.
• Why did Governor Phillip settle men on Prospect Hill in 1791?: Phillip settled men on the slopes of Prospect Hill because the soils, weathered from the basalt cap, were richer than the sandstone-derived soils found on the Cumberland Plain, indicating the area's agricultural potential.
• Who visited the Prospect intrusion site in the 19th century for geological study?: Charles Darwin visited the site in 1835, and American geologist James Dwight Dana visited in 1839. In January 1840, geologist William Branwhite Clarke accompanied Dana to study the rocks.

Related Concepts:

• What was Charles Darwin's hypothesis about the Prospect intrusion's formation?: Darwin observed that the sandstone country was interrupted by a mass of Trappean rocks, likely basalt, with a prismatic structure. He speculated that this rock had erupted through the sandstone.
• Who visited the Prospect intrusion site in the 19th century for geological study?: Charles Darwin visited the site in 1835, and American geologist James Dwight Dana visited in 1839. In January 1840, geologist William Branwhite Clarke accompanied Dana to study the rocks.
• What is the significance of the Prospect dolerite intrusion being listed on the NSW State Heritage Register?: Its inclusion signifies its recognition as a place of state importance, valued for its unique geological landscape, potential archaeological value, and its connection to significant historical periods in New South Wales. This listing helps protect the site for future generations.

Related Concepts:

• Which railway line served the Prospect quarry, and when was it operational?: The Widemere Quarry Line served the quarry, constructed in 1924 and operational until 1945. It connected the quarry to the Main Southern Line at Fairfield railway station.

Related Concepts:

• Which railway line served the Prospect quarry, and when was it operational?: The Widemere Quarry Line served the quarry, constructed in 1924 and operational until 1945. It connected the quarry to the Main Southern Line at Fairfield railway station.

Related Concepts:

• Who visited the Prospect intrusion site in the 19th century for geological study?: Charles Darwin visited the site in 1835, and American geologist James Dwight Dana visited in 1839. In January 1840, geologist William Branwhite Clarke accompanied Dana to study the rocks.
• Why did Governor Phillip settle men on Prospect Hill in 1791?: Phillip settled men on the slopes of Prospect Hill because the soils, weathered from the basalt cap, were richer than the sandstone-derived soils found on the Cumberland Plain, indicating the area's agricultural potential.
• What is the significance of the Prospect dolerite intrusion being listed on the NSW State Heritage Register?: Its inclusion signifies its recognition as a place of state importance, valued for its unique geological landscape, potential archaeological value, and its connection to significant historical periods in New South Wales. This listing helps protect the site for future generations.

Related Concepts:

• Who visited the Prospect intrusion site in the 19th century for geological study?: Charles Darwin visited the site in 1835, and American geologist James Dwight Dana visited in 1839. In January 1840, geologist William Branwhite Clarke accompanied Dana to study the rocks.
• What is the significance of the Prospect dolerite intrusion being listed on the NSW State Heritage Register?: Its inclusion signifies its recognition as a place of state importance, valued for its unique geological landscape, potential archaeological value, and its connection to significant historical periods in New South Wales. This listing helps protect the site for future generations.
• What was Charles Darwin's hypothesis about the Prospect intrusion's formation?: Darwin observed that the sandstone country was interrupted by a mass of Trappean rocks, likely basalt, with a prismatic structure. He speculated that this rock had erupted through the sandstone.

Related Concepts:

• Which railway line served the Prospect quarry, and when was it operational?: The Widemere Quarry Line served the quarry, constructed in 1924 and operational until 1945. It connected the quarry to the Main Southern Line at Fairfield railway station.
• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.

Related Concepts:

• What geological event led to the fractures that allowed magma to reach the surface?: Fractures formed due to the tense continental crust breaking down to the upper mantle during the development of a rift divergence zone. These fractures provided pathways for basaltic magma to ascend from the mantle.
• What is the geological term for the rock that forms the upper third of the intrusion?: The upper third of the intrusion is composed of dolerite, which also contains other mafic minerals. Dolerite is an intrusive igneous rock, typically medium-grained.

Related Concepts:

• What is the significance of the Prospect dolerite intrusion in Sydney?: It is significant as Sydney's largest body of igneous rock, rising to a height of 117 meters (384 ft) above sea level. It also provides panoramic views across the Cumberland Plain and is recognized for its geological and aesthetic value.
• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.
• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.

Related Concepts:

• What recent development has occurred at the Prospect dolerite intrusion site?: In recent years, parts of the site have been redeveloped for industrial use. Land levelling occurred between 2008 and 2010, and the area is now filling with large industrial buildings, with Reconciliation Road constructed through the center of the hill.

Related Concepts:

• What geological event led to the fractures that allowed magma to reach the surface?: Fractures formed due to the tense continental crust breaking down to the upper mantle during the development of a rift divergence zone. These fractures provided pathways for basaltic magma to ascend from the mantle.
• What is the geological term for the rock that forms the upper third of the intrusion?: The upper third of the intrusion is composed of dolerite, which also contains other mafic minerals. Dolerite is an intrusive igneous rock, typically medium-grained.

Related Concepts:

• What recent development has occurred at the Prospect dolerite intrusion site?: In recent years, parts of the site have been redeveloped for industrial use. Land levelling occurred between 2008 and 2010, and the area is now filling with large industrial buildings, with Reconciliation Road constructed through the center of the hill.

Related Concepts:

• What is the heritage status of the Prospect dolerite intrusion?: The Prospect dolerite intrusion, situated on Prospect Hill, was added to the New South Wales State Heritage Register on October 17, 2003. It holds state significance due to its unique geological landscape and historical associations.

Related Concepts:

• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• How did the Prospect dolerite intrusion contribute to Sydney's infrastructure development?: The dolerite extracted from the Prospect Quarry was a primary source of crushed rock used for building construction and the development of roads across Sydney, significantly supporting the city's growth.

Related Concepts:

• What is the geological significance of the intrusion being described as a laccolith?: Describing it as a laccolith indicates its formation as a mushroom-shaped intrusion where magma pushed upwards and spread out horizontally beneath the surface rock. While a typical laccolith has a dome shape, the Prospect intrusion's upper surface became concave due to erosion and quarrying.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.
• What are the dimensions of the Prospect dolerite intrusion?: The intrusion covers an area measuring 2.4 kilometers by 1.4 kilometers, making it a substantial geological feature within the Sydney Basin.

Related Concepts:

• What is the geological term for the volcanic material that moved from the Earth's upper mantle?: The volcanic material is described as hot magmatic fluids. These fluids ascended from the mantle and intruded into the overlying rock layers.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.

Related Concepts:

• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• What is the geological significance of the intrusion being described as a laccolith?: Describing it as a laccolith indicates its formation as a mushroom-shaped intrusion where magma pushed upwards and spread out horizontally beneath the surface rock. While a typical laccolith has a dome shape, the Prospect intrusion's upper surface became concave due to erosion and quarrying.
• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.

Related Concepts:

• What is the geological term for the volcanic material that moved from the Earth's upper mantle?: The volcanic material is described as hot magmatic fluids. These fluids ascended from the mantle and intruded into the overlying rock layers.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.
• What is the geological significance of the "chilled margin" mentioned in the description?: A chilled margin refers to a fine-grained igneous rock layer that forms when magma cools rapidly upon contact with cooler surrounding rock. The Prospect intrusion has a slender, chilled margin of fine-grained basalt.

Related Concepts:

• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.

Related Concepts:

• What is the relationship between the Prospect dolerite intrusion and Prospect Hill?: The Prospect dolerite intrusion is the geological feature that forms the core of Prospect Hill. The hill itself is a significant landmark and topographic feature in western Sydney, recognized for its geological composition.
• Was gold found at the Prospect dolerite intrusion site?: Yes, a small amount of gold was observed in a sample test in the 1960s, although no further discoveries have been made since then. The primary volcanic rocks on the site are predominantly mafic.
• What is the geological term for the volcanic material that moved from the Earth's upper mantle?: The volcanic material is described as hot magmatic fluids. These fluids ascended from the mantle and intruded into the overlying rock layers.

Related Concepts:

• What evidence suggests the Prospect dolerite intrusion had a volcanic origin?: The text states that the shaping of the intrusion unambiguously points to a volcanic origin, with volcanic material from the Earth's upper mantle being involved in its formation. The presence of basaltic magma and the resulting geological structures support this conclusion.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.
• What is the role of the New South Wales State Heritage Register in relation to the Prospect dolerite intrusion?: The Register lists the Prospect dolerite intrusion (as Prospect Hill) as a heritage item, acknowledging its state significance due to its geological, landscape, and historical importance. This listing helps protect the site for future generations.

Related Concepts:

• What is the geographic coordinate location of the Prospect dolerite intrusion?: The Prospect dolerite intrusion is located at approximately 33°49′30″S 150°55′05″E. These coordinates pinpoint its position in Western Sydney.
• What is the significance of the Prospect intrusion being described as "caldera-like"?: The term caldera-like likely refers to the altered, concave shape of the intrusion's upper surface, which resulted from quarrying activities. A caldera is typically a large volcanic crater, so this description highlights the dramatic modification of the natural geological form.