8723-2 Buldah Gap Area

This information has been developed from the publications:

Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers.
Sites of Geological and Geomorphological Significance in the Gippsland Lakes Catchment (1984) by Neville Rosengren.
Sites of Geological and Geomorphological Significance in East Gippsland, Victoria (1981) by Neville Rosengren, M.S McRae-Williams

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 for details of geological heritage reports, and a bibliography.

Location:	910675. Five kilometres north of Buldah	Site 8723-2
Abstract:	Mylonized granodiorite, overturned Upper Devonian sediments and a contact metamorphic ridge are the features displayed in this area.
Access:	Buldah Road.
Ownership:	Crown Land.
Geology:	Movements along the Buldah Fault have caused steepening and overturning of the Devonian sediments. Overturning of beds is well exposed near Buldah Gap, and the wide zone of Mylonized granodiorite indicates the intensity of faulting and shearing at this locality. Lower Devonian Noorinbee Granodiorite has intruded Ordovician sediments and resulted in the formation of a narrow metamorphic aureole, which is topographically expressed in the Buldah Gap ridge. The Ordovician sediments/ granodiorite contact is steeply dipping to the west where it is exposed in the short gorge section of the Cann River.
Geomorphology:	A contact metamorphic ridge composed of altered Ordovician sediments extends north from Buldah Gap. The dissection of this ridge in the south by the Cann River which has produced a short gorge section may be related to unmapped structural features, eg. local faulting.
Significance:	Regional. Faulting, resulting in drag effects on the Devonian sediments and mylonization of the granodiorite are well displayed in this area. The Buldah Gap contact metamorphic ridge is well developed and the exposure of the granodiorite/ Ordovician sediment contact in the short gorge section of the Cann River is one of the best examples of such a feature displayed in the region.
Management:	Maintenance of the available exposure in road cuttings will enhance the value of the site. Flooding in the short gorge on the Cann River by reservoir construction would obscure the Ordovician granodiorite contact and degrade the significance of the site.
References:	Spencer- Jones (1967)

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