6.1.3 Volcanic Western Plains with poorly developed drainage

The plains of the Newer Volcanic basalts that formed in the Late Pliocene and during the Pleistocene are generally characterised by thinner regolith development and poorly developed drainage. In these landscapes, flow boundaries are obvious, and corestones (‘floaters’) are often seen at the surface. Shallow drainage lines have developed, often along the boundaries of lava flows. Discontinuous drainage lines may end at ephemeral wetlands and swamps. Examples of this landform occur in the region from Warrambine to Armytage, with the best examples immediately north of the Wingeel Swamp.

Associated soil types are sodic and non-sodic texture contrast (moderately deep to deep) soils and some gradational (shallow to moderately deep) soils.