Aboriginal people made pottery and sailed to distant offshore islands thousands of years before Europeans arrived

[Judi Lynn]

4. It's possible the land features have been far more impermanent than elsewhere, through extreme erosions

from wind and water, or maybe the invaders ("settlers" ) were especially determined to vaporize any trace of the previous human occupants after general genocide, and removal of survivors to as great a distance as possible happened. It's possible they were that hostile toward indigenous Australian people, perhaps.

Can't imagine anything else as I know less than nothing about the country and its history.

I do know European conquerors have gone to irredeemable extremes to destroy all possible appearance of civilization already in place in countries they intended to raze to the foundation and take for themselves, and even now view the Western Hemisphere as the "New World."

Their views don't seem to impress the citizens whose ancestry in the "conquered" country is ancient.