5. North Western Dunefields and Plains (DP)
5.5.1 Prominent ridge tops with remnant aeolian sands and oriented swales with lakes and lunettes (north of Little Desert)
5.5.2 Low ridge tops with remnant aeolian sands and oriented swales with lakes and lunettes (south of Little Desert)
5.5.3 Prominent ridges with eroded ferruginized northern spurs (south of the Lower Norton Wimmera Bridge)
|This geomorphological unit is located in western Victoria, bordering South Australia with the unit extending into that State. The unit is spatially subdivided with the Little Desert separating the northern (5.5.1: Nhill) area from the southern (5.5.2: Goroke) area.|
This unit is also clearly bound by Siliceous Dunefields to the north (5.2), a Valley/depression system (5.6) to the east and a less clear boundary to the Tablelands (2.3) to the south, close to the Glenelg River.
The predominant landforms are a series of parallel ridges orientated to the NNW/SSE with intervening depression or flats. The ridges may vary in elevation, relative relief and morphology such that some are a complex of slope segments with higher elevation depressions while others have a simple convex form from one flat to the next. The major ridges can have a width of over 5 km with at least the same width for the adjoining flat, the smaller ridges have less width, closer to 2 km. Slope also varies with slopes of the order of 5% or less on most ridges but 8% on the larger ridges, particularly in the northern section, the southern section having more subdued relief and affected by more recent geological events as well as climate.
|Reading / references|
Blackburn, G, Bond , R D and Clarke, A R P (1967) Soil development in relation to stranded beach ridges of County Lowan, Victoria. Soil Publication 24, CSIRO, Australia.
Kotsonis, A (1996) Late Cainozoic landform mapping of the western Murray Basin, southeastern Australia, using night-time thermal data. Geological Society of Australia, 13th Australian Geological Convention, Canberra, 19-23 February 1996, Abtracts 41, 238.
Imhof, Thompson and Rees (1995) Major Agricultural Soils in the Shire of Lowan.
Blackburn, G and Gibbons, F R (1956) A Reconnaissance Survey of the Soils of the Shire of Kowree, Victoria. Soil and Land Use series No.17, CSIRO, Australia
Maher, J Soil- landforms Natimuk 1:100 000
Maher, J Soil- landforms Goroke 1:100 000
Baxter N, M Shire of West Wimmera