It massively predates any boats, and there are no boats in the history of the Aboriginals.
In fact nobody has even really bothered to try an explain it, because it's way, way, way outside the story that everyone came out of Africa.
It's perfectly explainable, they arrived by boat. The exact time and migration path is still pretty open for interpretation and revision, but building boats is not beyond the capability of the people at the time. All they needed was a fairly simple raft.
>In fact nobody has even really bothered to try an explain it, because it's way, way, way outside the story that everyone came out of Africa.
No it isn't, it's perfectly consistent with the out of africa hypothesis.
http://www.australiangeographic.com.au/news/2013/08/aborigin...