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1.1 Landscapes above 1200 m of low relief

1. Eastern Uplands (EU)

1.1.1 Summit plateaux (Mt Bogong, Baw Baw, Buffalo, Mt Wills)
1.1.2 Broad ridges, plateaux (Hotham-Lock Ridge, Mt Fainter Ridge, Barry Mountains, Davies Plain)
1.1.3 Enclosed landscapes of low relief (Horsehair Plain)
1.1.4 Capped (basalt) plains (Mt Jim-Bogong High Plains, Dargo Plains, Nunniong Plains)

Image:  1.1

The massive dissection of extensive areas of low relief at high elevation by the major drainage systems has left plateau remnants with elevations ranging from 1 000 m to 1 986 m (Mt. Bogong). Included are the granitic plateaus of Mt. Baw Baw and Mt. Buffalo, and the Bogong High Plains that is largely underlain by gneiss and schists and some granites/granodiorites. The southwestern part of the Bogong High Plains is covered by basalt of the Older Volcanics, with Basalt Hill, Mt. Jim and Ruined Castle showing columnar structure.

Broad ridges extend north from the Bogong High Plains between the East and West Kiewa Rivers and from Rocky Valley through Mt. Nels to Spion Kopje. A narrow ridge joins this ridge to the broad summits of Mt. Bogong. Separated from the Bogong High Plains by the deep valleys of the West Kiewa River and the Cobungra River, the rounded ridges that peak at Mt. Hotham (1 862 m), have been termed the Hotham Tablelands. Its topography changes eastwards to a flat tableland on the Cobungra-Dargo divide.

Discrete broad ridges found elsewhere are the Davies Plain Ridge, near Mt. Gibbo (1 757 m) and the Cobbler Plateau - correctly identified as a plateau - to the north of Mt Howitt.
Image: 1.1
The Howitt Plains stretch southwards from Mt Howitt, to become the Snowy Plains (or Range) that extends to Mt. Wellington and includes the Wellington Plains, and the Bennison Plains. The area that embraces the Mt. Wellington Plateau, the Wellington Plain (or Big Plain) and the broad upper Moroka valley is often referred to as the Wellington Tablelands. Higher peaks and ridges rise above some of these low-relief features.

The Dargo High Plains, at about 1 500 m elevation, forms a wide semi-planar ridge summit, lower and less extensive than the Bogong High Plains and mostly formed on basalt (Older Volcanics).

The small ridge top area of low relief at about 1 400 m surrounding The Cobberas (or Mt. Cobberas, 1 832 m), at the head of the Buchan River, links eastwards with the lower Wulgulmerang Plateau. The Nunniong Plateau of about 1 500 m elevation, is a flat basalt residual (Older Volcanics) south of The Cobberas. The extensive Monaro Plateau of southern New South Wales gradually declines in elevation southwards and terminates sharply south of Bendoc with an elevation of about 900 m.

The four Tiers (1.1.1, 1.1.2, 1.1.3 and 1.1.4) are distinguished on the basis of predominant landform, and in the case of 1.1.4, by the presence of basalt cappings that have protected the ancient surface they overlie. It is sometimes difficult to delineate these units because they are often intimately associated (e.g. basalt capped parts of the Cobungra – Dargo divide) or they merge from one to the other (e.g. a plateau may narrow to become a broad ridge that has different environmental properties such as drainage and exposure).

Sub-alpine woodlands of Snow Gum are widespread. Open grasslands and herbfields, and heathlands are dominant communities over much of the area, and very limited but highly valued wetlands of fen and mossbed occur in association with permanent water.

The soils on much of these high plains and ridges are organic loams (Chernic Tenosols), shallow stony soils (Leptic Rudosols) and deeper well-structured gradational or uniform soils (Brown Dermosols).

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