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K2 Bulla - Metamorphic Aureole

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 section of the Geological Society of Australia website (external link) for details of geological heritage reports, and a bibliography.

LocationKeilor - 05605. Shire of Bulla. Western side of Deep Creek 1.5 km south of Bulla.

Access
Loemans Road off Bulla-Diggers Rest Road

Ownership
Private land

Site Description
The site illustrates thermal metamorphism of Silurian sedimentary rocks by the intrusion of the Bulla Granodiorite. A traverse beginning of Loemans Road first crosses the level surface of the Newer Volcanics lava flows, while on the steeper slopes of Deep Creek and a tributary which forms a hanging valley on the west, are outcrops of Silurian mudstones and sandstones which have been baked by the heat of the intrusion to form hornfels and quartzite. Several dykes of granitic composition intrude the sediments near the hanging valley. The Bulla Granodiorite outcrops on the ridge north of the hanging valley, while beneath the lava and overlying the Silurian rocks to the south are thin Tertiary sands.

Significance


Regional. The site is a clear display of the changes introduced in sedimentary rocks by contact metamorphism, and includes clear exposures of sedimentary, intrusive, volcanic and metamorphic rocks in close proximity. It is one of the best localities in the study area to examine these varied rock types.

Management
Class 2. Continuation of present rural land use is compatible with maintaining the features of the site and permitting access to authorized group or individuals.

References
James, A.V.C. (1920). The Physiography & Geology of the Bulla/Sydenham Area. Proc. R. Soc. Vict. 32:323-349.
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