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Re: Genyornis (?) depicted in ancient Aboriginal rock art and other paleo news

> Ancient Aboriginal art in Australia may depict giant extinct bird Genyornis
> http://www.theage.com.au/national/rock-art-paints-a-different-prehistory-20130705-2phai.html

>From there:

"Tracing the long sweep of human presence through artworks and artefacts, rare 
archival footage and interviews with experts and Aboriginal elders at field 
sites around the country, the series takes an unapologetic stand against the 
thesis that man was the chief agent of the megafauna's extinction.

Instead, it identifies the key culprit as the coming of the ice age about 
30,000 years ago, an event that plunged as much as 90 per cent of the continent 
into drought.

Filmmaker Martin Butler, who produced the series with director Bentley Dean, 
says ''We believe the ice age killed the megafauna, not the people. It could 
not have been the people, because in our view there is now good evidence that 
the giant species survived until about 30,000 to 25,000 years ago.''

To support this stand, the series assembles evidence from several ancient 
artworks and preliminary findings from recent sites where massed remains of 
megafauna have been found.

Rock art expert Ben Gunn, who first identified the giant bird image as a likely 
depiction of Genyornis, is convinced whoever painted it saw the bird alive 
because the anatomy so closely matches what experts can recreate from the 

OK, so, Last Glacial Maximum did it.

But why the last one and none of the previous ones? Wasn't the 2nd-to-last one 
a bit worse than the last one?