8623-12 Boulder Flat

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:	695522. 15 kilometres south-west of Combienbar.	Site 8623-12
Abstract:	Exposures of Lower Devonian clastic sediments, volcaniclastics and limestones.
Access:	Errinundra Valley Road.
Ownership:	Crown Land (including road Reserve) with a small area of owned land.
Geology:	At Boulder Flats, an outlier of Lower Devonian clastic sediments, volcaniclastics and limestones is preserved in a syncline infaulted into Ordovician sediments. The Errinundra Valley Road cutting at boulder composed of interbedded tuffs, agglomerates, acid volcanics, fossiliferous shales, mudstones, sandstones, grits and limestone. The mudstones contain abundant fossils (Tentaculites and spirifers), the shales contain Tentaculites and flattened brachipods, while the limestone is sparsely fossiliferous containing occasional spirifers. The Devonian sediments and volcanics are separated from the Ordovician sediments by a strike fault which is exposed in the southern section of the road cutting. The interbedded volcanics and sediment sequence has been interpreted as a transitional group occurring at the top of the Snowy river Volcanics while the limestone appears to be comparable to the Buchan Caves Limestone. This deposit represents the most easterly occurrence of Snowy River Volcanics and Buchan Caves Limestone in Victoria.
Significance:	Regional. Most easterly occurrence of Lower Devonian volcanics and sediments.
Management:	The value of the site would be enhanced by the maintenance of clear faces on the road cuttings of the Errinundra Valley Road.
References:	Thomas, D.E. 1949. 'Limestone at Errinundra', Min. geol. J. Vict., 3(5) :24-26. Douglas, J.G. 1974. 'Explanatory Notes on the Mallacoota 1:250,00 Geological Map', Geological Survey Report, No. 1974/5, Mines Department, Victoria. O'Shea, P.J. 1980. 'Mineral Potential of the Snowy River Volcanics and Buchan Caves Limestone', Proc. R. Soc. Vict., 84 :207-211.

Limestone at Errindundra (from Thomas, 1949)

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