|In the Heytesbury region the drainage has been strongly influenced by the ridges and swales of strand lines left by the retreating late Tertiary (Neogene) sea, which has formed a rectilinear pattern of parallel arcuate tributaries running north-west to south-east, and so perpendicular to rivers draining south-west. The development of the drainage has been associated with the final Late Neogene uplift of the adjacent Otways Ranges, between 2 Ma and 1 Ma (Sandiford 2003). The deep dissection has exposed underlying Gellibrand marl, resulting in numerous landslides, many of which remain active. |
Associated soil types include acidic mottled texture contrast soils (Kurosols), acidic gradational soils (Dermosols), some sandy some with high organic matter content (Podosols).