6.1.4 Volcanic Western Plains with well developed drainage

Transitional to geomorphic unit 6.1.3 are the plains with well developed drainage, which represent the earlier Pliocene volcanic landscapes. Examples of this landform can be seen in the region north-west of Cressy and south-east of Wallinduc, in the area where drainage is well established and ephemeral wetlands are relatively few. These areas are characterised by very planar landscapes with thicker soil development. Towards the Western Uplands to the north, the basalt plains are covered by a thin veneer of sandy and silty outwash deposits.

Associated soil types are predominantly black and brown sodic mottled texture contrast soils.