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177. Rhyll Quarry - Rhyll Arkose

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


Location:
Rhyll – 512417. Southern side of Rhyll Inlet, 1 km north-east of Rhyll.
Image: Sites of Significance Westernport Bay
Beds of Rhyll Arkose, Rhyll quarry, Site 177
Access:Walk around the cliff top to the west from the end of the road overlooking Rhyll Inlet.
Ownership:Crown land.
Geology:The abandoned quarry face exposes a 10 m high section of feldspathic grits and arkose with some thin mudstone beds (Edwards 1945). Fragments of plant fossils have established the age of the beds as Lower Cretaceous (Medwell 1954). The beds are gently folded and show a generally southerly dip. Because of lithological differences compared with other Mesozoic rocks in the Westernport catchments (the absence of volcanic fragments and low feldspar content), Jenkin (1962) proposed that the beds are given formation status as the Rhyll Arkose.
Significance:State. The site includes the only known Mesozoic outcrop known on Phillip Island. The beds represent the only lithological subdivision to be made to formation level of the Mesozoic rocks in the Gippsland basin.
Management:Class 2. Any activity that would obscure or degrade the exposures in the quarry eg – artificial fill or dumping of rubbish, should be prohibited.
References:
Blandowsk.i (1857).
Edwards, A.B. (1945). The geology of Phillip Island. Ibid. 57 (1+2) 1-21.
Medwell, L.M. (1954). A review and revision of the flora of the Victorian Lower Jurassic. Proc. Roy. Soc. Vict. 65 (2). 6-11.
Jenkin, J.J. (1962). The geology and hydrogeology of the Westernport area. Dept. of Mines Vict. Underground Water Investgation Report No. 5.
O’Brien, P.E. (1976). The Mesozoic fluviatile sediments of the San Remo Peninsula. B.Sc.Hons. thesis (unpub.), Dept. of Melb.

177. Rhyll Quarry - Rhyll Arkose
Sites 177 to 179, Rhyll Inlet area
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