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Jervis Bay formed as a drowned river valley 15,000 years ago at the end of the last ice age.[10] The bay took its present appearance around 4000BCE after the sea levels had risen 120m and as sand dune barriers created the southern peninsula.[11] Much of the rock in Jervis Bay is part of the Sydney Basin sandstone formation, aged 280-225 million years old, although lower areas are overlain with Tertiary-era sediments.[11]
Several features at Jervis Bay have been used as evidence that the Australian coast has experienced many giant tsunami prior to European colonisation
Australian Geographic Tsunami report. – makes interesting reading. Read on
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