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Beyond
the South East
Site: Tropical Coast (Qld)
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In extensive shallow areas these fine sediments, when above low tide level, can be colonised and stabilised by plants, especially mangroves, which form important fish and crustacean breeding grounds. Such areas also act as vital habitats for wading birds. Through this process of land extension a river delta may be built up; the Burdekin River has a well developed delta at its mouth. Many other rivers have built extensive river mouth deposits. |
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As a result of weathering of softer minerals, the resistant quartz remains as coarse grains to form the bulk of the island's soil. The most common minerals of the Magnetic Island Granite are quartz, two forms of feldspar, and biotite. The Magnetic Island Granite is believed to have been intruded between 280-260 million years ago. |
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Magnetic Island is adjacent to Townsville, the largest city of tropical Australia. It is separated from the mainland by a shallow water body about 5km wide. Some attractive beaches are located between rocky headlands. |
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The cablecar system was built in the 1990s, and was subject to very stringent environmental conditions - the area is part of the World Heritage listed Wet Tropics. The system allows the safe viewing of landscapes, as well as the tropical rainforest canopy from above. At the time of construction there was considerable opposition to the project on environmental grounds. |
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When the nearby railway was originally constructed, hand tools were used, and working conditions were very harsh. Both railway and cablecar assist in reducing vehicular traffic on the escarpment roadway, which has grown considerably over recent years with increasing tourism to the region. |
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Photo A Lake Barrine, a volcanic crater lake or maar, formed about 10,000 years ago when magma below the surface came into contact with ground water, initiating a series of violent explosions. Photo B Curtain Fig Tree, growing on the fertile basaltic soil of the Tableland. Photo C Rugged gorge of the Barron River, which drains the eastern Tableland. Hydro-electric power is generated here at the base of the escarpment. Photo D Barron Falls, where the river tumbles over the rugged escarpment of the Tableland. The river is shown in low flow conditions; in the wet season this view from here is very spectacular - a torrent instead of a trickle! |
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Hinchinbrook Channel runs left-right across the photo, in front of the island. The low-lying area in the foreground and middle distance are parts of the mainland built up by the deposition of fine sediments from the Herbert and Seymour Rivers, and the numerous creeks of the district. Mangrove forest covers these low-lying areas. |
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SOUND ![]()
Northern
wet season sounds
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LANDFORM LINKS |
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Igneous Rocks are found
along parts of the Tropical Coast Basalt (eg. Atherton Tableland) Granite (eg. Townsville) |
| Igneous Rock Classification |
| Salt (mineral produced along the N Qld coast) |
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General
estuary information:
Estuary definition A Estuary definition B Estuary forms Estuary impacts & types |
| Rivers - nutrient loads and transport |
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| Wet Tropics: World Heritage Area - A |
| Wet Tropics: World Heritage Area - B |
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Kidcyber: Taipan (snake) Kidcyber: Cassowary (bird) Kidcyber: Crocodile |
| Townsville: Biodiversity Protection Case Study |
| Jellyfish (Marine Stinger) Fatalities |
| Dr Peter Fenner - Marine Stingers |
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Site / Photos: (c)
C.Grant 2002, 2003
(except where otherwise indicated)