Northern Territory

Ayers Rock

Written by Unknown World

Uluru (English pronunciation: /ˌuːluːˈruː/), also known as Ayers Rock and officially gazetted as Uluru / Ayers Rock, is a large sandstone rock formation in the southern part of the Northern Territory in central Australia. It lies 335 km (208 mi) south west of the nearest large town, Alice Springs, 450 km (280 mi) by road.

Kata Tjuta and Uluru are the two major features of the Uluṟu-Kata Tjuṯa National Park. Uluru is sacred to the Anangu, the Aboriginal people of the area. The area around the formation is home to a plethora of springs, waterholes, rock caves, and ancient paintings. Uluru is listed as a UNESCO World Heritage Site.

Name

The local Pitjantjatjara people call the landmark Uluṟu (Aboriginal pronunciation: [uluɻu]). This word has no further particular meaning in the Pitjantjatjara language, although it is used as a local family name by the senior Traditional Owners of Uluru.

On 19 July 1873, the surveyor William Gosse sighted the landmark and named it Ayers Rock in honour of the then Chief Secretary of South Australia, Sir Henry Ayers. Since then, both names have been used.

In 1993, a dual naming policy was adopted that allowed official names that consist of both the traditional Aboriginal name and the English name. On 15 December 1993, it was renamed “Ayers Rock / Uluru” and became the first official dual-named feature in the Northern Territory. The order of the dual names was officially reversed to “Uluru / Ayers Rock” on 6 November 2002 following a request from the Regional Tourism Association in Alice Springs.

Description

Uluru is one of Australia’s most recognisable natural landmarks. The sandstone formation stands 348 m (1,142 ft) high, rising 863 m (2,831 ft) above sea level, with most of its bulk lying underground, and has a total circumference of 9.4 km (5.8 mi). Both Uluru and the nearby Kata Tjuta formation have great cultural significance for the Aṉangu people, the traditional inhabitants of the area, who lead walking tours to inform visitors about the local flora and fauna, bush foods and the Aboriginal dreamtime stories of the area.

Uluru is notable for appearing to change colour at different times of the day and year, most notably glowing red at dawn and sunset.

Kata Tjuta, also called Mount Olga or The Olgas, lies 25 km (16 mi) west of Uluru. Special viewing areas with road access and parking have been constructed to give tourists the best views of both sites at dawn and dusk.

Ayers Rock 2

Geology

Uluru is an inselberg, literally “island mountain”. An inselberg is a prominent isolated residual knob or hill that rises abruptly from and is surrounded by extensive and relatively flat erosion lowlands in a hot, dry region. Uluru is also often referred to as a monolith, although this is a somewhat ambiguous term that is generally avoided by geologists. The remarkable feature of Uluru is its homogeneity and lack of jointing and parting at bedding surfaces, leading to the lack of development of scree slopes and soil. These characteristics led to its survival, while the surrounding rocks were eroded. For the purpose of mapping and describing the geological history of the area, geologists refer to the rock strata making up Uluru as the Mutitjulu Arkose, and it is one of many sedimentary formations filling the Amadeus Basin.

Composition

Uluru is dominantly composed of coarse-grained arkose (a type of sandstone characterized by an abundance of feldspar) and some conglomerate. Average composition is 50% feldspar, 25–35% quartz and up to 25% rock fragments; most feldspar is K-feldspar with only minor plagioclase as subrounded grains and highly altered inclusions within K-feldspar. The grains are typically 2–4 millimetres (0.079–0.157 in) in diameter, and are angular to subangular; the finer sandstone is well sorted, with sorting decreasing with increasing grain size. The rock fragments include subrounded basalt, invariably replaced to various degrees by chlorite and epidote. The minerals present suggest derivation from a predominantly granite source, similar to the Musgrave Block exposed to the south. When relatively fresh, the rock has a grey colour, but weathering of iron-bearing minerals by the process of oxidation gives the outer surface layer of rock a red-brown rusty colour. Features related to deposition of the sediment include cross-bedding and ripples, analysis of which indicated deposition from broad shallow high energy fluvial channels and sheet flooding, typical of alluvial fans.

Age and Origin

The Mutitjulu Arkose is believed to be of about the same age as the conglomerate at Kata Tjuta, and to have a similar origin despite the rock type being different, but it is younger than the rocks exposed to the east at Mount Conner, and unrelated to them. The strata at Uluru are nearly vertical, dipping to the south west at 85°, and have an exposed thickness of at least 2,400 m (7,900 ft). The strata dip below the surrounding plain and no doubt extend well beyond Uluru in the subsurface, but the extent is not known.

The rock was originally sand, deposited as part of an extensive alluvial fan that extended out from the ancestors of the Musgrave, Mann and Petermann Ranges to the south and west, but separate from a nearby fan that deposited the sand, pebbles and cobbles that now make up Kata Tjuta.

The similar mineral composition of the Mutitjulu Arkose and the granite ranges to the south is now explained. The ancestors of the ranges to the south were once much larger than the eroded remnants we see today. They were thrust up during a mountain building episode referred to as the Petermann Orogeny that took place in late Neoproterozoic to early Cambrian times (550-530 Ma), and thus the Mutitjulu Arkose is believed to have been deposited at about the same time.

The arkose sandstone which makes up the formation is composed of grains that show little sorting based on grain size, exhibit very little rounding and the feldspars in the rock are relatively fresh in appearance. This lack of sorting and grain rounding is typical of arkosic sandstones and is indicative of relatively rapid erosion from the granites of the growing mountains to the south. The layers of sand were nearly horizontal when deposited, but were tilted to their near vertical position during a later episode of mountain building, possibly the Alice Springs Orogeny of Palaeozoic age (400-300 Ma).

Fauna and Flora

Historically, 46 species of native mammals are known to have been living near Uluru; according to recent surveys there are currently 21. Aṉangu acknowledge that a decrease in the number has implications for the condition and health of the landscape. Moves are supported for the reintroduction of locally extinct animals such as Malleefowl, Common Brushtail Possum, Rufous hare-wallaby or Mala, Bilby, Burrowing Bettong and the Black-flanked Rock-wallaby.

The Mulgara, the only mammal listed as vulnerable, is mostly restricted to the transitional sand plain area, a narrow band of country that stretches from the vicinity of Uluru to the Northern boundary of the park and into Ayers Rock Resort. This area also contains the marsupial mole, Woma Python and Great Desert Skink.

The bat population of the park comprises at least seven species that depend on day roosting sites within caves and crevices of Uluru and Kata Tjuta. Most of the bats forage for aerial prey within 100 m (330 ft) or so from the rock face. The park has a very rich reptile fauna of high conservation significance with 73 species having been reliably recorded. Four species of frog are abundant at the base of Uluru and Kata Tjuta following summer rains. The Great Desert Skink is listed as vulnerable.

Aṉangu continue to hunt and gather animal species in remote areas of the park and on Aṉangu land elsewhere. Hunting is largely confined to the Red Kangaroo, Bush Turkey, Emu, and lizards such as the Sand Goanna and Perentie.

Of the 27 mammal species found in the park, six are introduced: the house mouse, camel, fox, cat, dog, and rabbit. These species are distributed throughout the park but their densities are greatest near the rich water run-off areas of Uluru and Kata Tjuta.

Uluru – Kata Tjuta National Park flora represents a large portion of plants found in Central Australia. A number of these species are considered rare and restricted in the park or the immediate region. There are many rare and endemic plants in the park.

The growth and reproduction of plant communities rely on irregular rainfall. Some plants are able to survive fire and some are dependent on it to reproduce. Plants are an important part of Tjukurpa, and there are ceremonies for each of the major plant foods. Many plants are associated with ancestral beings.

Flora in Uluru – Kata Tjuta National Park can be broken into the following categories:

  • Punu – trees
  • Puti – shrubs
  • Tjulpun-tjulpunpa – flowers
  • Ukiri – grasses

Trees such as the Mulga and Centralian Bloodwood are used to make tools such as spearheads, boomerangs and bowls. The red sap of the bloodwood is used as a disinfectant and an inhalant for coughs and colds.

There are several rare and endangered species in the park. Most of them, like Adder’s Tongue ferns, are restricted to the moist areas at the base of the formation, which are areas of high visitor use and subject to erosion.

Since the first Europeans arrived, 34 exotic plant species have been recorded in the park, representing about 6.4% of the total park flora. Some, such as perennial buffel grass (Cenchrus ciliaris), were introduced to rehabilitate areas damaged by erosion. It is the most threatening weed in the park and has spread to invade water- and nutrient-rich drainage lines. A few others, such as burrgrass, were brought in accidentally, carried on cars and people.

Ayers Rock 3

Climate and five Seasons

The park has a hot desert climate and receives an average rainfall of 284.6 mm (11.2 in) per year. The average high temperature in summer (December–January) is 37.8 °C (100.0 °F), and the average low temperature in winter (June–July) is 4.7 °C (40.5 °F). Temperature extremes in the park have been recorded at 46 °C (115 °F) during the summer and −5 °C (23 °F) during winter. UV levels are extreme most days, averaging between 11 and 15 on the UV index.

Local Aboriginal people recognise five seasons:

  1. Wanitjunkupai (April/May) – Cooler weather
  2. Wari (June/July) – Cold season bringing morning frosts
  3. Piriyakutu (August/September/October) – Animals breed and food plants flower
  4. Mai Wiyaringkupai (November/December) – The hot season when food becomes scarce
  5. Itjanu (January/February/March) – Sporadic storms can roll in suddenly

History

Archaeological findings to the east and west indicate that humans settled in the area more than 10,000 years ago. Europeans arrived in the Australian Western Desert in the 1870s. Uluru and Kata Tjuta were first mapped by Europeans in 1872 during the expeditionary period made possible by the construction of the Australian Overland Telegraph Line. In separate expeditions, Ernest Giles and William Gosse were the first European explorers to this area.

While exploring the area in 1872, Giles sighted Kata Tjuta from a location near Kings Canyon and called it Mount Olga, while the following year Gosse observed Uluru and named it Ayers Rock, in honour of the Chief Secretary of South Australia, Sir Henry Ayers. Further explorations followed with the aim of establishing the possibilities of the area for pastoralism. In the late 19th century, pastoralists attempted to establish themselves in areas adjoining the Southwestern/Petermann Reserve and interaction between Aṉangu and white people became more frequent and more violent. Due to the effects of grazing and drought, bush food stores became depleted. Competition for these resources created conflict between the two groups, resulting in more frequent police patrols. Later, during the depression in the 1930s, Aṉangu became involved in dingo scalping with ‘doggers’ who introduced Aṉangu to European foods and ways.

Between 1918 and 1921, large adjoining areas of South Australia, Western Australia, and the Northern Territory were declared as Aboriginal reserves, sanctuaries for nomadic people who had virtually no contact with European settlers. In 1920, part of Uluru – Kata Tjuta National Park was declared an Aboriginal Reserve (commonly known as the South-Western or Petermann Reserve) by the Australian government under the Aboriginals Ordinance.

The first tourists arrived in the Uluru area in 1936. Beginning in the 1940s, permanent European settlement of the area for reasons of the Aboriginal welfare policy and to help promote tourism of Uluru. This increased tourism prompted the formation of the first vehicular tracks in 1948 and tour bus services began early in the 1950s. In 1958, the area that would become the Uluru – Kata Tjuta National Park was excised from the Petermann Reserve; it was placed under the management of the Northern Territory Reserves Board and named the Ayers Rock – Mount Olga National Park. The first ranger was Bill Harney, a well-recognised central Australian figure. By 1959, the first motel leases had been granted and Eddie Connellan had constructed an airstrip close to the northern side of Uluru.

On 26 October 1985, the Australian government returned ownership of Uluru to the local Pitjantjatjara Aborigines, with one of the conditions being that the Aṉangu would lease it back to the National Parks and Wildlife agency for 99 years and that it would be jointly managed. An agreement originally made between the community and Prime Minister Bob Hawke that the climb to the top by tourists would be stopped was later broken. The Aboriginal community of Mutitjulu, with a population of approximately 300, is located near the eastern end of Uluru. From Uluru it is 17 km (11 mi) by road to the tourist town of Yulara, population 3,000, which is situated just outside of the national park.

The 25th anniversary of the handback of title was celebrated on 26 October 2010.

On 8 October 2009, the Talinguru Nyakuntjaku viewing area opened to public visitation. The A$21 million project about 3 kilometres (1.9 mi) on the east side of Uluru involved design and construction supervision by the Aṉangu traditional owners, with 11 kilometres (6.8 mi) of roads and 1.6 kilometres (1 mi) of walking trails being built for the area.

About the author

Unknown World

Hello, my name is Mike! I am the founder of Unknown World, aiming to bring as much information about our planet to one place for everyone to see!

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