While the Earth has seen numerous Ice Ages, only one has affected Victoria
Roughly 400-500 million years ago, the sea covered the area, allowing sand and mud to be deposited. After the sea withdrew, uplifting occurred, forming north-south running mountain ranges. This was followed by a long period of erosion. Approximately 250 million years ago, glaciers formed and as they moved over the land they exposed large granitic rocks. Rubble was deposited in the valleys and conglomerates and sandstone were deposited in the lakes and rivers that were created as the glaciers melted. These are some of the earliest glacial deposits known to exist in the world, adding to the geological significance of the Bacchus Marsh area.
- Bacchus Marsh Trench Reserve Committee of Management Inc.
- Interpretive signage at the Triassic Park Reserve, 2021.
- G.W. Cochrane, G.W. Quick, D. Spencer-Jones (ed.), Introducing Victorian Geology, Geological Society of Australia Inc. (Victorian Division), 1999.
- Leon Costermans & Fons VandenBerg, Stories beneath our feet, Costermans Publishing (2022).
- Victorian Environment Assessment Council, ‘Park Overview, Lerderderg,’ (2013)
- Parks Victoria website, ‘Lerderderg State Park,’ (2012).