This information has been obtained from the report: Eruption Points of the Newer Volcanic Province of Victoria by Neville Rosengren. This report was published in 1994 and was prepared for the National Trust of Australia (Victoria) and the Geological Society of Australia (Victorian Division). The review of eruption points was based on an earlier unpublished manuscript Catalogue of the post-Miocene volcanoes of Victoria compiled by O P Singleton and E B Joyce (Geology Department, University of Melbourne 1970).
|37 34 00S 144 56 00E (external link); 7822-1-1 (Donnybrook) 174398. 2 km N of Craigieburn. Mount Ridley Road.|
Road across near summit, small quarry, farm, buildings on top, outcrop.
Mount Ridley is a broad lava hill with two vents approximately 600 m apart, the southern vent apparently erupting first. The vents are now lava filled and are recognisable only from the concentration of blocks of spatter and vesicular lava. Most of the loose blocks have been cleared from the paddocks. The lava from the northern vent of Mount Ridley is the only known example of a nephelinite (analcitite) in the Newer Volcanics Province.
289 m; 45 m.
The site is significant for the uncommon lava type and as a regional example of a lava mound.
Edwards, A.B. (1938). The Tertiary volcanic rocks of central Victoria. Quarterly Journal of the Geological Society of London 94, pp 243-320.
Hanks, W. (1955). Newer Volcanic vents and lava fields between Wallan and Yuroke, Victoria. Proceedings of the Royal Society of Victoria 67, pp. 1-16.
Price, R.C., Gray, C.M., Nicholls, I.A. & Day, A. (1988). Cainzoic volcanic rocks. In J.G. Douglas and J.A. Ferguson (eds) Geology of Victoria. Geological Society of Australia, Victoria Division, Melbourne, pp. 439-451.
Mount Ridley 7822-1-1 (Donnybrook)