The terrace sequences implies about 7 stages of erosion and then deposition since the late Tertiary (now part of the Neogene period) /start of the Quaternary period.
For an example of terrace development highlighting the Briagolong Terrace (Quaternary, Pleistocene, level 4; Qp4) see below:
Figure 1: Deposition of the sediments on which the Briagolong Unit soils are formed. |
Figure 2: Erosion of the Briagolong land-surface following a period of uplift or sea level change. |
Figure 3: Valley in-filled with later sediments on which the Stratford Unit soils are formed. |
Figure 4: Erosion of the Stratford Unit land-surface following a period of uplift or sea level change. |
Figure 5: Valley in-filled with later sediments (Qp6a, 6b) - see table below. |
Geological Subdivision | Landform | Landform Elements | Map Unit |
Qp6a | Terrace | Terrace plain | |
Qp6b | Stagnant alluvial plain | Levee | |
Backplain | |||
Dune | |||
Swamp |
Figure 6: Major sea level change associated with the last ice age resulted in erosion of late Pleistocene sediments. |
Figure 7: Present floodplains of Newry, Thomson, and La Trobe Units become in-filled with sediments. |
Figure 8: Generalised cross-section between Heyfield and north of Latrobe River near Rosedale (diagrammatic only - not to scale). |
Figure 9: Generalised cross-section across Avon River and related terraces (diagrammatic only - not to scale). |
Figure 10: Generalised indication of past sea levels. |
Map Unit |
|
Br - Briagolong |
|
Cg - Coongulla |
|
Ne - Newry |
|
Ti - Tinamba |
|