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Sydney Harbour as we know it today with its sheer cliffs, deep water, numerous bays and small rocky islands is in geological time only very young, about 6000 years old.
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Geology of Sydney Harbour
Sydney Harbour is made up of mostly sandstone and shale formed during the Triassic period (about 220 million years ago).
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Sydney waters - changing sea levels
Sydney Harbour is a deep water estuary. Its present form was created by changes in sea level which occurred over many thousands of years.
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Copyright © Australian Museum, 2002
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