TV9 Djerriwarrh Creek - Unconformity

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.

Location	Toolern Vale - 804342. Shire of Melton. Road cutting 200 m of crossing of Djerriwarrh Creek.	TV9 - Rounded gravels (G) overlying Ordovician (O) sediments near Lake Merrimu.
Access	Diggers Rest to Coimadai Road.
Ownership	Crown land
Site Description	The road cutting displays the unconformity between steeply dipping Ordovician sediments and the Early Pleistocene Ordovician sediments and the Early Pleistocene Darley Gravel. The gravels are coarse, rounded and well-bedded and set in a sandy matrix. The gravel clasts have been derived from the erosion of earlier formed gravels eg - the Bullengarook Gravel and from the Palaeozoic rocks outcropping in highland areas to the north.
Significance	Local. The site is a clear display of an unconformity between materials of vastly differing ages. It is an accessible teaching locality that has the advantage of being on a road with limited traffic movement.
Management	Class 2. Any road maintenance or widening operations should be designed to maintain the clarity of the unconformity.

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