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G1 - Warrandyte Gorge - Structural Geology and River Channel Morphology

This information has been developed from the publications:

  • Sites of Geological and Geomorphological Significance in the Western Region of Melbourne (1986) by Neville Rosengren
  • Sites of Geological and Geomorphological Significance on the Coast of Port Phillip Bay (1988) by Neville Rosengren.
  • Sites of Geological and Geomorphological Significance in the Shire of Otway (1984) by Neville Rosengren.
Geological heritage sites, including sites of geomorphological interest and volcanic heritage sites, are under regular revision by the Geological Society of Australia, especially in the assessment of significance and values. Reference should be made to the most recent reports. See the Earth Science Heritage (external link) section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.

Location:AMG Ref 462248, Yarra River channel and banks adjacent to Bouchiers Road.
Image: Sites of Environmental Significance
Outcrops transverse to channel
from rapids in the
Warrandyte Gorge (G1)

Access:
Bouchiers Road off Menzies Road.

Geology:
Silurian siltstones of the Andersons Creek Formation outcrop in the river channel with a strike approximately north-south and easterly dip of 40o to 50o.

Geomorphology:
The site shows clearly the influence of rock structure in determining channel characteristics and the alignment of the valley. Resistant beds outcrop in the channel and form the rapids and islands in this site.

The angular nature of the bend and the straight section to the south are parallel to and determined by the north-south strike of the sediments. Small potholes on the rock surface illustrate a major process of stream abrasion and channel lowering. On the inside (east) of the bend opposite Bouchiers Road is a small depositional flat where the rock ridges are covered by a thin veneer of river alluvium.

Significance:
Regional. This sector clearly illustrates the influence of local rock structures in determining channel alignment and pattern. The rock outcrops in the channel are exposed during normal river level. They are not obscured to any extent by vegetation or alluvial deposits, and bedding, dip, an strike can be readily determined. On the whole, the trend of the river channel between Warrandyte and the Yering Gorge is either transverse or oblique to the strike of the rocks with only short sectors aligned parallel to strike. Hence, the sector indicated for this site is representative of that general character.

Management:
Class 2. No structures that would obscure the major rapids should be permitted in the area of the site.


G1 - 2 Warrandyte Gorge
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