Rollinsons quarry, Malmsbury, Macedon Ranges Shire, Victoria, Australia
|Latitude & Longitude (WGS84):||37° 19' 60'' South , 144° 22' 0'' East|
|Latitude & Longitude (decimal):||-37.33333,144.36667|
|Köppen climate type:||Cfb : Temperate oceanic climate|
Rollinsons quarry is one of a number of small basalt quarries east of Malmsbury, and 95 km north of Melbourne, Victoria. These quarries are situated in the basic lavas of what have been traditionally known as the Newer Volcanics, more recently referred to as the Westen District Province. The Province is divided into two sub-provinces: the smaller Central Highlands Sub-province, covering the dissected uplands of central Victoria; and the Western Plains Sub-province, extending more than 300 km west from the plains near Melbourne to South Australia. The basalts of the Malmsbury area are located in the northern part of the Central Highlands Sub-province, dominated by scoria and lava shield volcanoes. Recent studies show the lava plains basalts as dominantly tholeiitic or transitional olivine basalts.
Lava plains resulted from the merging of a number of flows from various vents which filled and overflowed from old watercourses. The lava plain extending east from Malmsbury consists of four, and possibly more,flows and is probably derived from eruption centres near Green Hill, approximately 5.5 km north of Malmsbury. The individual flows varied in physical properties, including hardness, susceptibility to weathering, and the number and size of vesicles. As a result they tended to be quarried separately and pillars of useless rock were left standing in the quarries.
Little, if any of the material remains by the roadside near Rollinsons quarry. Most of the quarries in the Malmsbury district are on private property and some of them still operate as small scale enterprises. Permission is required from the owners before entering or collecting from these sites, and failure to do so is not viewed favourably.
12 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Darriwilian - Tremadocian|
458.4 - 485.4 Ma
Age: Ordovician (458.4 - 485.4 Ma)
Stratigraphic Name: Castlemaine Group
Comments: sedimentary siliciclastic; synthesis of multiple published descriptions
Lithology: Sedimentary siliciclastic
Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia).