Hallett Cove Conservation Park - Geology of The Park - Pliocene


A second period of erosion began around 250Ma which removed most of the Permian sediments in the region with the exception of some that were protected by the Hallett cove basin. This forms the second unconformity that separates the Permian from the Pliocene deposits.

By the Cenozoic, the Mt Lofty Ranges had worn down to sea level. A period of faulting commenced which uplifted the ranges and downthrust the plains which, beginning 50Ma was flooded by the sea. By 20Ma the land west of the ranges was a shallow sea. Hallett Cove has no sediments from this period indicating it may have been above sea level, an island in a shallow sea.

Further faulting raised the Mt Lofty Ranges to a little higher than their current elevation and submerged Hallet Cove. Dated at 5Ma to 3Ma, a band of sandstone that had been laid down on a sea floor can be found overlaying the Permian deposits. This layer contains fossil shells and limy sands. Overlaying the sandstone is a considerable thickness of mottled clays with patches of sand and gravel, the sediments washed down from the slopes of the Mt Lofty Ranges from 3Ma to 1Ma when the area was a river flood plain.

Read more about this topic:  Hallett Cove Conservation Park, Geology of The Park

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