1. Eastern Uplands (EU)
1.2.1 Plateaux and broad ridges (Straghbogie, Koetong-Shelly, Errinundra, Kinglake, Olinda)
1.2.2 Enclosed landscapes of low relief (Fraser Tableland, Benambra)
|The Omeo landscape (600 – 800 m) is included in this Tier of low relief although its local relief (up to 120 m) is often slightly above the defined “low” category (up to 90 m). It is a most complex area where the dominant metamorphic (gneissic) rocks are usually deeply weathered and easily eroded, and it includes the Hinnomunjie swamp north-east of Omeo resulting partly from recent fault movements. Also included is a basin eroded by the Livingstone Creek that has alluvial deposits up to 15 m thick.|
The Fraser Tableland area north of Benambra (about 650 m) was formed by the partial infilling of the valley of Deep Creek, and the lower reaches of Morass Creek, a tributary of the Mitta Mitta River by basalt of Pliocene (Neogene) age. The subsequent entrenchment of the streams in these infilled valleys has resulted in gorge-like valleys in the Morass Creek, and steep slopes where the Mitta Mitta River has encroached from the west, leaving the basaltic surface as the uplands known as the Fraser Tablelands. The enclosing hills, mainly on the northern and eastern sides, are some 100-200 m higher.
The Morass Creek valley plain is a depositional plain with impeded drainage formed by the damming of the drainage by a basalt flow. It is a tributary of the Mitta Mitta River to the west, and because it is at a higher elevation it is a hanging valley. A number of associated valleys occur upstream such as upper Morass Creek and Benambra Creek, which are bound by scarp faces such as the Beloka Range.