2. Gembrook East Lava Residual

This information has been developed from one or more of these publications:

Sites of Geological and Geomorphological Significance in the Westernport Bay Catchment (1984) by Neville Rosengren.
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 Environmental Significance in the Flood Plain of the Upper Yarra Valley Region (1983) by Neville Rosengren, Douglas Frood and Kim Lowe (as part of a study of Sites of Environmental Significance by the University of Melbourne for the then Upper Yarra Valley and Dandenong Ranges Authority).

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:	Gilwell – 750982. Three kilometres east of Gembrook	Gembrook East lava residual
Access:	Beenak East Road.
Ownership:	Private land and Crown Land.
Geology/Geomorphology:	The site includes an area on the watershed between the Westernport stream system and the tributaries of the Yarra River. The Beenak East Road traverses a ridge of Older Basalt that rests on a weathered and eroded surface of Tynong Granite. At the junction of Grey and Parker roads, there is a low point on the divide referred to in early literature as the Gembrook Gap or Beenak Gap (Edwards, 1940). This region figured prominently in the early literature as a possible site of a pre-basaltic stream system extending from the Woori Yallock Basin towards the south and hence crossing the present divide.
Significance:	Regional. The site is of particular interest in the context of early geomorphological discussion on the evolution of the Yarra and Westernport drainage systems.
Management:	Class 3. No special management is required to maintain the characteristics of the site.
References:	Gregory (1903) Keble, R.A. (1918). The significance of lava residuals in the development of Western Port and Port Phillip drainage systems. Proc. Roy. Soc. Vict. (31) 1 124-165. Edwards, A.B. (1940). A note on the physiography of the Woori Yallock Basin. Proc. Roy. Soc. Vict. 52 (1) 336-341.

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