Rocky outcrops and volcanic remnants along the South-East coast of Queensland played a vital role in the creation of what we now know as Fraser Island.
River in New South Wales carried with them sand and particles from the tablelands. Currents carried them north and a lot this sand was eventually caught by these outcrops. The prevailing South-East winds swept it up into high dunes. After the last ice age, sea levels rose and disconnected Fraser Island from the main land.