Cumberland Plain

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Cumberland Plain
Sydney Plain
Plain
Sydney suburbs geocover.png
The Cumberland Plain covers the sweeping Greater Western Sydney area, from the Inner West to Penrith.
Coordinates: 33°45′S151°00′E / 33.750°S 151.000°E / -33.750; 151.000 [1]
Location Greater Western Sydney, Northern Sydney, Inner West, St George
Area
 • Total2,750 km2 (1,060 sq mi)
Rivers Hawkesbury River, Nepean River, Parramatta River, Georges River, Woronora River

The Cumberland Plain, also known as Cumberland Basin, [2] is a relatively flat region lying to the west of Sydney CBD in New South Wales, Australia. An IBRA biogeographic region, Cumberland Basin is the preferred physiographic and geological term for the low-lying plain of the Permian-Triassic Sydney Basin found between Sydney and the Blue Mountains, and it is a structural sub-basin of the Sydney Basin. [3]

Contents

The Cumberland Plain has an area of roughly 2,750 square kilometres (1,060 sq mi), which lies on Triassic shales and sandstones. Shaping the geography of Sydney, it extends from 10 kilometres (6.2 mi) north of Windsor in the north, to Picton in the south; and from the Nepean-Hawkesbury River in the west almost to Sydney City, and includes parts of the Inner West and Northern Suburbs in the east. Much of the Sydney metropolitan area is located on the Plain. The Hornsby Plateau is located to the north and is dissected by steep valleys. [4]

The plain takes its name from Cumberland County, in which it is situated, one of the cadastral land divisions of New South Wales. The name Cumberland was conferred on the County by Governor Arthur Phillip in honour of Ernest Augustus, Duke of Cumberland. [1] Being the most populous region in Australia, the Cumberland Plain is one of the fastest-growing areas of the country in terms of population and it is home to a variety of Australian animal species, which are observable in the urban environments. [5]

Geography

Typical savannah-like, grassy woodlands in the plain. Cumberlain Plain Woodland2.jpg
Typical savannah-like, grassy woodlands in the plain.

The Cumberland Plain stretches from Ryde in the east to the Nepean River in the west and from Cattai in the north to Thirlmere in the far south. The Cumberland Plain sprawls over south-western Sydney, and into the Greater Western Sydney area. It is within the local government areas of Blacktown, Burwood, Camden, the western portion of Campbelltown, Canada Bay, Canterbury-Bankstown, Cumberland, Fairfield, Georges River, Hawkesbury, the Western outskirts of the Inner West Council, Liverpool, Parramatta, Penrith, Ryde, Strathfield, The Hills Shire, Wingecarribee, and Wollondilly.

The Cumberland Plain is defined by the more hilly regions that fall into other Sydney regions such as Sydney CBD (in the City of Sydney), North Shore, Northern Beaches, Eastern Suburbs, Southern Sydney (including Sutherland Shire), Hills District, Hornsby Shire and the Forest District, which areas are not part of the Cumberland Plain. [6]

The region mostly consists of low rolling hills and wide valleys in a rain shadow area near the Blue Mountains. The annual rainfall of the plain is typically around 700–900 mm, and is generally lower than the elevated terrain that partially surrounds it. Common vegetation in the Cumberland Plain is eucalyptus trees. The moderately fertile soils in the plain are usually red and yellow in texture due to their clay-rich nature, [7] [8] where they turn coarser and are sometimes affected by salt in confluent valley floors. Red to brown clays are found on volcanic rocks. Poor rocky soils, frequently on older gravels, and high quality loams are present on contemporary floodplain alluvium. [9]

The sclerophyll woodlands are situated on a nutrient-poor alluvium deposited by the Nepean River from sandstone and shale bedrock in the Blue Mountains. Despite this, they support a tremendous regional biodiversity. [10] Cleared and used first for agriculture and then for urban development, most of the ecological communities that originally flourished on the plain are now considered endangered. [11]

Geology

An aerial view of the urbanized plain in western Sydney, which is encircled by a series of plateaus. ISS012-E-13231 - View of New South Wales.jpg
An aerial view of the urbanized plain in western Sydney, which is encircled by a series of plateaus.

The Cumberland basin is a structural and topographical depression within the sedimentary Sydney Basin in Australia's southeast. Formed about 80 million years ago, the Cumberland Plain consists of not exactly flat plains; overall it is a low-lying area, largely over shale and labile sandstone, which derives its recognition largely by comparison with the surrounding uplands of harder quartzose Sydney sandstone. Relative to the surrounding higher sandstone lands, Hornsby Plateau and Blue Mountains Plateaux (which was uplifted 90 million years ago), it was an early matter of debate in Sydney physiographic circles as to whether the Cumberland Plain had gone down, or the surrounding plateaux had been raised up. The Cumberland Basin’s perimeters had therefore developed in various ways and at different time period, where volcanic and tectonic movements had accompanied the uplift of Australia's Eastern Highlands within the time zone of 80–10 million years ago. [2]

To the south, the Cumberland Basin's topography is closely linked to the development of the Camden Syncline, which was active in the late Permian to the Middle Triassic period. The Botany Basin, which would have started to settle since the Oligocene, sits within this Lachlan Transverse Zone, which hints that this area of the Basin would have already existed at this stage. [2] During the Cenozoic period, the Penrith and Botany basins may have acted as the Cumberland Basin's drainage, thereby explicating the incomprehensible activity of rivers within the area. [2] Despite much study, especially along the western side at the Lapstone monocline, this complex matter is still not fully understood. [12] There are volcanic rocks from low hills in the shale landscapes. Swamps and lagoons are existent on the floodplain of the Nepean River.

The Wianamatta Plain, with many undulating hills of Wianamatta Group shales and sandstones, bounded by the Woronora and Illawarra Plateaus to the south, the Blue Mountains Plateau to the west and the Hornsby Plateau to the north/northeast. At the front of the Blue Mountains Plateau runs the Lapstone Structural Complex, which forms the western edge of the Cumberland Basin and Cumberland Plain. This is a north-south trending collection of reverse faults and monoclinal folds which extends generally north south for over 100 kilometres (62 mi). At the opposite side of the Cumberland Plain the Hornsby Plateau is fronted by the Hornsby Warp. That warp is topographically subtle in comparison to the Lapstone Structural Complex, and it is a feature which is poorly defined and inadequately defined in literature.

The Prospect dolerite intrusion in western Sydney is the largest assemblage of igneous rock in the Plain. The oval-shaped ridge was made many millions of years ago when volcanic material from the Earth's core actuated upwards and then sideways. [13] Slow erosion of the overlying layers of sedimentary rock by the flow of rainwater have eventually laid bare the edges of the volcanic and metamorphic rocks of the intrusion. [14] The western suburbs lie on the relatively flat, lowly elevated parts of the Cumberland Plain. Though there are a few hilly or relatively elevated regions on the plain. Western Sydney Parklands and the surrounding suburbs (such as Cecil Hills and Horsley Park), for instance, lies on a prominent ridge that is between 130 and 140 metres (430 and 460 ft) high. [3]

The Parramatta River is the most prominent river that flows within the Cumberland Plain. Headwaters of the Parramatta River.jpg
The Parramatta River is the most prominent river that flows within the Cumberland Plain.

Bringelly Shale and Minchinbury Sandstone are often seen in the Plain's west. [15] [16] Ashfield Shale is observed in the inner western suburbs. [17] These components are part of the Wianamatta Shale group. [18]

Rivers

Rivers in the Cumberland Plain are salient. The Nepean River rises to the south in the Woronora Plateau, and wraps around the western edge of the city. Parramatta River's headwaters are several local creeks including Toongabbie Creek and Hunts Creek, part of the upper Parramatta river catchment area. Hunt's creek flows from Lake Parramatta, a few kilometres North of Parramatta. Warragamba River flows 3.5 kilometres (2.2 mi) north-east from the Warragamba Dam spillway to its confluence with the Nepean River. [19]

The south and southwest of Sydney is drained by the Georges River, flowing north from its source near Appin, towards Liverpool and then turning east towards Botany Bay. The other major tributary of Botany Bay is the Cooks River, running through the inner-south western suburbs of Canterbury and Tempe. The Georges River estuary separates the main part of Sydney's urban area from the Sutherland Shire. The Woronora River, on the southern edge of the Sydney Plain, flows in a steep-sided valley from the Woronora Dam to the eastern estuary of the Georges River.

Minor waterways draining Sydney's western suburbs include South Creek and Eastern Creek, flowing into the Hawkesbury, and Prospect Creek draining into the Georges River.

Ecology

Flora

The Cumberland Plain as viewed from atop the Western Sydney Parklands in Horsley Park Lookoutridge.jpg
The Cumberland Plain as viewed from atop the Western Sydney Parklands in Horsley Park

The most predominant plant communities in the Cumberland Plain are grassy sclerophyll woodlands, with over 830 native species. [20] Dry and wet sclerophyll forests generally lie on the Hornsby plateau, an elevated region north of the Plain. Dry sclerophyll forests contain eucalyptus trees which are usually in open woodlands that have dry shrubs and sparse grass in the understory. [21] [12]

In 1820s, Peter Cunningham described the country west of Parramatta and Liverpool as "a fine timbered country, perfectly clear of bush, through which you might, generally speaking, drive a gig in all directions, without any impediment in the shape of rocks, scrubs, or close forest". This confirmed earlier accounts by Governor Arthur Phillip, who suggested that the trees were "growing at a distance of some twenty to forty feet from each other, and in general entirely free from brushwood..." [22] [23]

Fauna

The Cumberland Plain is home to a variety of bird, insect, reptile and mammal species, including bats. Arachnid, amphibian and crustacean species are also present. [24]

About 40 species of reptiles are found in the Cumberland Plain. 30 bird species exist in the urban areas, with the common ones being the Australian magpie, Australian raven, noisy miner and the pied currawong. Introduced birds include the common mynah, common starling and the house sparrow.

14 mammal species are widespread in the plain, with common species being those of bats and possums. The outskirts of the Cumberland Plain, such as those adjacent to large parks, have a great diversity of wildlife. [25] [26]

Vegetation communities

Cumberland Plain features three main plant communities: [27]

Shale Plains Woodland reserved in Western Sydney Regional Park Cumberlain Plain Woodland2.jpg
Shale Plains Woodland reserved in Western Sydney Regional Park
River-flat forest on Cataract River, near Appin Broughton Pass Weir.jpg
River-flat forest on Cataract River, near Appin
Shale Sandstone Transition Forest remnant at Georges River National Park - panoramio (2249).jpg
Shale Sandstone Transition Forest remnant at Georges River National Park
Cooks River/Castlereagh Ironbark Woodland Cooks River-Castlereagh Ironbark Forest.jpg
Cooks River/Castlereagh Ironbark Woodland

The Western Sydney Dry Rainforest is oftentimes found in sheltered gullies within the Cumberland Plain woodland, where it was originally 1,282 ha in size, but now only 338 ha remains. On the eastern peripheries of the plain, Shale Plains Woodland morphs into Turpentine-Ironbark Forest where the annual rainfall surpasses 950 mm. Rising to the Hornsby Plateau, the Turpentine-Ironbark Forest transitions into Blue Gum High Forest where the precipitation is above 1050 mm. Three discrete communities are acknowledged on margins of the plain, which are Shale Sandstone Transition Forest, High Sandstone Influence sub-communities and the Turpentine-Ironbark Margin Forest, which is present on the bounds of the Hornsby and Woronora Plateaus. Four communities were found on two isolated alluvial deposits in the northwest (Castlereagh) and southeast (Holsworthy) corners of the plain. These were, Cooks River/Castlereagh Ironbark Forest at 1,012 ha, which occur on soils with a high clay content, and Castlereagh Scribbly Gum Woodland being more common on sandy loam soils. [28]

Castlereagh Swamp Woodland is found in poorly drained slumps in the Holsworthy and Castlereagh areas. Wind-blown deposits in the section of Agnes Banks support a defined assemblage of hard-leaved species known as Agnes Banks Woodland, at 615 ha. On the margins of the alluvial sedimentation, Castlereagh Ironbark Forest transitions into Shale Gravel Transition Forest on separated alluvium superimposed on Wianamatta Shale, which is currently at 1,721 ha. The scarcest community on the Cumberland Plain is Elderslie Banksia Scrub Forest , at 13.4 ha, which is present on the deep sand deposition of the old alluvial rows of the Nepean River near Camden, where it morphs with Cumberland Plain Woodland and Sydney Coastal Riverflat Forest. The Riparian Forest, such as Coastal Swamp Oak Forest, is restricted to streams and adjoining swampy areas, and is closely related to Castlereagh Swamp Woodland when it comes to the floral species. Furthermore, Alluvial Woodland occurs on large floodplains more than 100 metres away from a river, where they transition into Shale Plains Woodland. [28]

Apart from these aforementioned woodland communities, another 11 vegetation communities are found scattered on the Cumberland Plain: [28]

Protection

Under Federal environmental legislation, six of the above ecological communities are protected as four "matters of national environmental significance". Some are grouped together into broader communities that share similarities in landscape position, structure and/or species.

The four nationally defined and protected threatened ecological communities are: Blue Gum High Forest of the Sydney Basin Bioregion; Cumberland Plain Shale Woodlands and Shale-Gravel Transition Forest; Shale/Sandstone Transition Forest; Turpentine-Ironbark Forest in the Sydney Basin Bioregion; and Western Sydney Dry Rainforest and Moist Woodland on Shale. The plain has 300 different native plants and is home to over 20 threatened bird and animals. [33]

Cumberland Plain communities are protected in a number of council reserves, plus the Lower Prospect Canal Reserve, Scheyville National Park, Windsor Downs Nature Reserve, Leacock Regional Park and Mulgoa Nature Reserve and Mount Annan Botanic Garden. Cumberland Plain Woodland, of which around six per cent remains in isolated stands, was the first Australian ecological community to be assigned this status. [34]

Agriculture

A countryside in Western Sydney with an open bushland. Western Sydney (Badgerys Creek) Airport site - Anton Rd.JPG
A countryside in Western Sydney with an open bushland.

The western portion of the Cumberland Plain mainly consists of sparsely populated, vast, rural grasslands with undulating hills and scenic vistas. The Sydney western suburbs of Mount Vernon, Kemps Creek, Orchard Hills, Luddenham, Mulgoa, Bringelly, Silverdale and Horsley Park, among others, lie in this agricultural countryside, adjacent to the footsteps of the Blue Mountains westwards of these country plains. [35]

Furthermore, Abbotsbury, Cecil Hills and Glenmore Park were farms through until the 1980s when it was decided to redevelop them for housing. The area around the site of Regentville has remained largely rural, if hemmed in somewhat by the modern residential suburbs of Jamisontown and Glenmore Park. [36]

In the 1800s, John Blaxland built an original wooden weir at "Grove Farm" (now known as Wallacia) for a sandstone flour mill and additional brewery. The land was also used for wheat farming until 1861 when wheat rust infected the entire crop. [37] The rural regions were chiefly one of dairying and grazing during the 19th century, but in the early 20th century – because of its rural atmosphere and proximity to Sydney – tourism developed as people opened their homes as guest houses. Today, the rural areas include a number of orchards and vineyards in the meadows. Vegetable farming and fruit picking are common activities. [38]

See also

Related Research Articles

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<span class="mw-page-title-main">Cooks River/Castlereagh Ironbark Forest</span>

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<span class="mw-page-title-main">Cumberland Plain Woodland</span> Indigenous woodland community in Sydney, Australia

The Cumberland Plain Woodland, also known as Cumberland Plain Bushland and Western Sydney woodland, is a grassy woodland community found predominantly in Western Sydney, New South Wales, Australia, that comprises an open tree canopy, a groundcover with grasses and herbs, usually with layers of shrubs and/or small trees.

<span class="mw-page-title-main">Sydney Sandstone Ridgetop Woodland</span> Indigenous forest communities of Sydney, Australia

The Sydney Sandstone Ridgetop Woodland, also known as Coastal Sandstone Ridgetop Woodland and Hornsby Enriched Sandstone Exposed Woodland, is a shrubby woodland and mallee community situated in northern parts of Sydney, Australia, where it is found predominantly on ridgetops and slopes of the Hornsby Plateau, Woronora Plateau and the lower Blue Mountains area. It is an area of high biodiversity, existing on poor sandstone soils, with regular wildfires, and moderate rainfall.

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<span class="mw-page-title-main">Southern Highlands Shale Forest and Woodland</span> Ecological community in New South Wales

The Southern Highlands Shale Forest and Woodland is a mixed grassy woodland and sclerophyll-temperate forest community situated within the Southern Highlands region of New South Wales, Australia. An ecotone featuring clay soils derived from Wianamatta Group, it is listed as an endangered ecological community by the Environment Protection and Biodiversity Conservation Act 1999 as less than 5% of the original extent remains today. Three varieties of the Shale Woodland exist: ‘typical’, ‘tall wet’ and ‘short dry’.

<span class="mw-page-title-main">Shale Sandstone Transition Forest</span> Indigenous woodland community in Sydney, Australia

The Shale Sandstone Transition Forest, also known as Cumberland Shale-Sandstone Ironbark Forest, is a transitory ecotone between the grassy woodlands of the Cumberland Plain Woodlands and the dry sclerophyll forests of the sandstone plateaus on the edges of the Cumberland Plain in Sydney, Australia.

<span class="mw-page-title-main">Elderslie Banksia Scrub Forest</span> Indigenous woodland community in Sydney, Australia

The Elderslie Banksia Scrub Forest is a critically endangered scrubby woodland situated in southwestern Sydney, New South Wales, Australia. Listed under the Environment Protection and Biodiversity Conservation Act 1999, it is a variety of stunted forest or woodland found on sandy substrates associated with deep Tertiary sand deposits, which has been reduced in extent of at least 90% of its original pre-European extent.

References

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  2. 1 2 3 4 "Age and origin of the Cumberland (Inner Sydney) Basin of southeast Australia". Taylor & Francis. 2020. Retrieved 5 December 2023.
  3. 1 2 Carter, Lewis (2011). Tectonic Control of Cenozoic Deposition in the Cumberland Basin, Penrith/Hawkesbury Region, New South Wales (Bachelor of Science (Honours) thesis). School of Earth & Environmental Sciences, University of Wollongong.
  4. ↑ "Sydney Basin". Office of Environment & Heritage. 2014. Retrieved 12 July 2014.
  5. ↑ Cooke, J.; Willis, T.; Groves, R. (2005). "Impacts of woody weeds on Cumberland Plain Woodland biodiversity". In Pellow, B.; Morris, C.; Bedward, M.; Hill, S.; Sanders, J.; Clark, J. (eds.). The ecology and management of Cumberland Plain habitats: a symposium. Campbelltown: University of Western Sydney. p. 7.
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  11. ↑ NPWS (2002a) Native Vegetation of the Cumberland Plain – Final Edition, NPWS, Sydney.
  12. 1 2 Benson, D. H.; Howell, J. (1990). Taken for Granted: The Bushland of Sydney and Its Suburbs. Sydney: Kangaroo Press and the Royal Botanic Gardens Sydney.
  13. ↑ Compton, Keith (21 February 2017). "Prospect, New South Wales". Mindat. Hudson Institute of Mineralogy. Retrieved 24 March 2018.
  14. ↑ Morrison, Conybeare (2005). Prospect Hill Conservation Management Plan. Holroyd City Council.
  15. ↑ Lovering, J. F. "Bringelly Shale" (PDF). STRATIGRAPHY OF' THE WIANAMATTA GROUP. Australian Museum. Retrieved 23 August 2012.
  16. ↑ "Minchinbury Sandstone". Stratigraphic Search Geoscience Australia. Australian Government. Retrieved 24 October 2012.
  17. ↑ Packham, Gordon Howard, ed. (November 1969). The Geology of New South Wales. Sydney: Geological Society of Australia. pp. 417–421.
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  20. ↑ "Coastal Valley Grassy Woodlands". NSW Environment & Heritage. Retrieved 15 December 2019.
  21. ↑ "Dry sclerophyll forests (shrub/grass sub-formation)". NSW Environment & Heritage. Retrieved 15 October 2016.
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  23. ↑ "Sydney Coastal Dry Sclerophyll Forests". NSW Environment & Heritage. Retrieved 17 September 2012.
  24. ↑ Williams, J.; et al. (2001). Biodiversity, Australia State of the Environment Report 2001 (Theme Report). Canberra: CSIRO Publishing on behalf of the Department of the Environment and Heritage. ISBN   0-643-06749-3.
  25. ↑ Burton, Thomas C. (1993). "9. Family Microhylidae" (PDF). Fauna of Australia series, Environment Australia website. Canberra: Department of the Environment, Water, Heritage and the Arts, Australian Government. Archived from the original (PDF) on 20 March 2011. Retrieved 19 August 2010.
  26. ↑ Australian Museum Online. "Crows and Ravens". Archived from the original on 1 September 2007. Retrieved 12 August 2007.
  27. ↑ Tozer M. (2003). ‘The native vegetation of the Cumberland Plain, western Sydney: systematic classification and field identification of communities’. Cunninghamia. 8, 1: 1–75.
  28. 1 2 3 4 5 Recovering bushland on the Cumberland Plain Department of Environment and Conservation (NSW). (2005). Recovering Bushland on the Cumberland Plain: Best practice guidelines for the management and restoration of bushland. Department of Environment and Conservation (NSW), Sydney. Retrieved 12 September 2022.
  29. ↑ French K, Pellow B and Henderson M 2000, Vegetation of the Holsworthy Military area. Cunninghamia 6(4): 893–939.
  30. ↑ Leary T (2005) Fauna survey of Parks and Wildlife Division estate on the Cumberland Plain with some observations on the remnant mammal fauna. P15 in (Eds. B Pellow, C. Morris, M Bedward, S. Hill, J Sanders, J Clark) The ecology and management of Cumberland Plain habitats: a symposium (University of Western Sydney: Campbelltown).
  31. ↑ NSW SCIENTIFIC COMMITTEE – ESTABLISHED UNDER THE THREATENED SPECIES CONSERVATION ACT 1995 Office of Environment & Heritage. Retrieved 16 September 2022.
  32. ↑ "Beverly Grove Vegetation Plan of Management" (PDF). Roads & Maritime Services . Government of New South Wales.
  33. ↑ NPWS (2002b) Interpretation Guidelines for the Native Vegetation Maps of the Cumberland Plain, Western Sydney, Final Edition, NPWS, Sydney.
  34. ↑ "Species Profiles (SPRAT)".
  35. ↑ Australian Heritage Commission (1981). The Heritage of Australia: the illustrated register of the National Estate. South Melbourne The Macmillan Company of Australia in association with the Australian Heritage Commission. p. 2/11. ISBN   978-0-333-33750-9.
  36. ↑ "An old family". Sydney Morning Herald . New South Wales: National Library of Australia. 21 March 1914. p. 4. Retrieved 16 September 2011.
  37. ↑ "NEWINGTON FARM". Sydney Morning Herald . NSW: National Library of Australia. 5 April 1930. p. 9. Retrieved 30 April 2012.
  38. ↑ "Census of population and housing: selected characteristics for urban centres, Australia" (PDF). Australian Bureau of Statistics. 2003. Retrieved 5 October 2014.
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