Interesting in depth recent article on same, discusses the Bradshaws and other aspects of this ...
"Weekend Edition January 18-20, 2013
Race, Ethnicity and First Settlement Australia’s Adam Complex by BINOY KAMPMARK
Race, ethnicity and origins are always up for political grabs. No one really wants to know that they were preceded by someone else, that they were not the first ones there. This is the Adam complex, and no culture is immune from it.
A study published in the Proceedings of the National Academy of Sciences conducted by German geneticists suggests that there was a “substantial gene flow between Indian populations and Australia about 4,230 years ago” (Sci-News, Jan 15).... "
Full Source: http://www.counterpunch.org/2013/01/18/australias-adam-complex/
