CMD wrote: The aborigines were in Australia by 55,000 years ago. How did they get there?
We don’t know for sure but they seem to have arrived at least partly by sea, but during a period of glaciation when New Guinea and Tasmania were joined to the main Australian continent. A substantial part of the journey could have been accomplished by land bridges, especially if the arrival was as long ago as 70,000 years, when they could have got as far as Timor without ocean travel. If they arrived later, it was probably via the Moluccas and then New Guinea. Some sea voyaging would have been inevitable, but there is a strong possibility for island-hopping in short trips when sea levels were much lower and chains of small islands were exposed. The sea journey portions may have been accomplished by primitive rafts. Reed-bundle rafts would have been quite adequate for that.
The likely landfall regions have been under more than 150 feet of water for the last 15,000 years so we will likely never know for certain.
This is how we think things looked around 50,000 years ago. The open-water ocean gap between Australia and Asia was probably as small as 50 miles, and in earlier times may have been smaller still:
[image from Wikimedia]
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