So let me get that straight:
the people that colonized the Andamans and shortly thereafter Oz were accomplished seafarers. Then they trekked south to Tasmania overland, and when sealevels rose they had suddenly forgotten how their ancestors travelled the high seas for aeons?
That don't jive, bro!
Imo the original Tasmanians – the people that got stranded there at the end of the ice age – by that very fact clearly demonstrated that neither they nor their ancestors ever had even the first clue about negotiating open water!
And when the need for it arose they still
weren't capable of developing seafaring skills...
And since Qantas wasn't there yet they can only have walked
to Oz. Following the seashores. Beachcombing for (sea) food. On the edge of the water all their lives long. For hundreds of generations. Splashing through the surf collecting mussels and crabs. And (dis)covering new continents almost as 'collateral damage'.
But never more than knee deep.
60,000 years ago there was a landbridge between New Guinea and Oz. And you can still clearly see it today, thanks to Google Earth:
Indonesia's location on the edges of the Pacific, Eurasian, and Australian tectonic plates, makes it the site of numerous volcanoes and frequent earthquakes. Indonesia has at least 150 active volcanoes, including Krakatoa and Tambora, both famous for their devastating eruptions in the 19th century. The eruption of the Toba supervolcano, approximately 70,000 years ago, was one of the largest eruptions ever, and a global catastrophe.
I.o.w. that piece of real estate is the most tectonic/volcanic/seismic active region on the globe. It is in a permanent state of flux. Has been for aeons. Lifting up large tracts of land. Exploding others. Creating and destroying landbridges, coastlines and seashores all the time. Even altering major ocean currents, affecting climates. Creating all sorts of opportunities for enterprising beachcombers to constantly colonize new lands. Only to find themselves stranded on islands when sealevels rose, or landbridges sunk. Hence the different states of floral and fauna evolution in the various parts of the archipelago and Oz.
Last edited by Rokcet Scientist on Fri Mar 21, 2008 4:21 pm, edited 3 times in total.