These units account for the Snowy River floodplain near Orbost and are based on the recent alluvial material that makes up the floodplain area; floodplain, levees, terraces, ox-bow lakes (billabongs) and previous water course alignments. These sediments are of Recent (Quaternary) origin. The Plain units extend from west of Orbost to the base of Mt. Raymond to the east and southward merge into coastal flats at the base of the Marlo Tertiary outcrop. The Cabbage Tree floodplain joins this system. The range of soils in these units is variable due to varied rates and type of deposited material e.g. pebbles, gravel, sand, silt and clay. The native vegetation has been almost totally cleared but Lowland Sclerophyll Forest, Coastal Sclerophyll Forest, Riparian Forest and Warm Temperate Forest were all probably present. Geology: Qra, Qr1, Qp5; Recent and Pleistocene (Quaternary) alluvium. Sand, gravel, silt and minor clay. Rainfall: 700-1000 mm per annum. Slope: 0-10%, generally less than 3%. Dominant landform element: Plain, open depressions, drainage depressions. Minor landform element: Terrace. |