Some snapshots of a recent field trip looking at past environments of South East Australia

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The ancient shorelines of Lake Bullen Merri, a combination of human influence and natural processes has lead to a gradual decline in lake levels. This was one of several lakes in SW Victoria that formed as a result of a Maar. It reaches 69 metres deep in the very middle of the lake and has a very high salinity.

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Lake Purrumbete was one of the few freshwater lakes in the area and unlike Lake Bullen Merri doesn’t have the very steep shoreline.
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The dried out remains of several more Maar lakes.
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A close look at the Point Ritchie limestone. This marks the western end of the Great Ocean Road and the limestone features of this southern coastline.
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One of the sleeping Koalas that became the highlight of a lunch break. 
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The dramatic Limestone coastline of the Great Ocean Road.
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A natural arch that has eroded into the limestone, a common feature along limestone coastlines.
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Loch Ard Gorge 
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Not too long ago there was a natural bridge (London Bridge) connecting the limestone cliffs but it collapsed into the sea as a result of erosion.
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Blue Lake at Mt Gambier, about 70 metres at its deepest this lake sits within an ancient volcanic crater that erupted through several layers of limestone (white edge just above the water).
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Mummified possum at the Naracoorte Caves
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One of the many paleontological digs within the Naracoorte Cave System.
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Speleothems!
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More Speleothems!
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Just a few more Speleothems!
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The Naracoorte Caves are well known for the large number of Megafauna fossils that have been found, this is one of the major dig sites uncovering the ancient creatures.
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The pink shoreline of Halite Lake in South Australia, it is pink due to the precipitation of salts and microbial matter in the lake.
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A close up of the halite crystals within the shoreline, the larger rectangular crystals are about 1.5cm in length.
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Pretty pink salty shoreline.
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Ancient sand dunes are now preserved in these limestone cliffs. Sea level would have been about 8 metres below current level when these dunes were active.
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The edge of Lake Fellmongery has a microbialite crust which forms as the microbes precipitates out a calcium carbonate.
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A close up of the microbialite, the pink colouration protects the microbes from sunlight.
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Panorama of the white dunes from the Lake Mungo lunette.
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The pink tinted inside edge of the Lake Mungo lunette. This would have been the edge of the lake many years ago and there are lots of scattered remains of Aboriginal activity in the area.