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Spring Hill (Balliang East)

Balliang East


374630S 1442830E; 7722-2-1 (Balliang Creek) & 7722-1-2 (Lerderderg) 770195 to 778161. 11 km SE of Bacchus Marsh. Spring Hill Road. Ballan Road. Exford Road.

Bacchus Marsh

Private land:
Agriculture, boulder outcrops (many paddocks cleared of stones).

Type 2:
Lava shield.

This is a large site and consists of number of eruption points along a north-south alignment over a distance of 2 km along the crest of a low, broad ridge. The eruptions produced numerous overlapping lava flows building an irregular lava shield with a remnant shallow crater on the northern flank. This pyroclastic deposits are interbedded with lava. The site also encloses two shallow broad craters 10 to 20 m deep with a rim of pyroclastic material. These do not appear to have given rise to lava flows and may have resulted from steam or gas explosions breaching a thin lava crust.


160+m; 20m.

Regional:
A good example of the volcanicity that produced much of the Werribee Plains. This is an example of a broad low angle eruption point typical of that built by very fluid lavas. Pyroclastic eruptions are unusual on the Werribee Lava Plains. These are good regional examples of small explosion craters during the last phases of volcanicity in this area. The crates are subtle landforms and their identity would be easily lost if the area was covered by residential subdivision.

Class 2:
Roadworks and buildings on the low angle slopes destroys the visual unity of sites of little relief such as this one.

References:
Coulson, A. 1938. The basalts of the Geelong district. Proceedings of the Royal Society of Victoria 50, pp. 251-257.
Condon, M.A. 1951. The geology of the lower Werribee River, Victoria. Proceedings of the Royal Society of Victoria 63, pp. 1-24.
Ollier, C.D. & Joyce, E.B. 1964. Volcanic physiography of the Western Plains of Victoria. Proceedings of the Royal Society of Victoria 77, pp. 357-376.
Roberts, P.S. 1984. Explanatory notes on Bacchus Marsh and Ballan 1:50 000 geological maps. Geological Society of Victoria Report 76.
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