RFI: Nullarbor/Isolation of SWWA

[Ian Fraser <>]

IN talking about 'observed' speciation, SWWA provides some of the nicest
examples in Australia. My problem is that I'm finding it remarkably
difficult to get information on the history of nexus/isolation of the SW
with the SE via the Nullarbor. 

>From the yellow robins, and presumably the black-cockies, it's obviously
been 'joined' at least twice in the relatively recent past - and I ASSUME
post-Pliocene (though that could be way out too). Can anyone at least point
me in the right direction?

Thanks!

Ian
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Ian Fraser, Canberra  
Environment Tours; Vertego Environmental Writing Consultancy
GPO Box 3268, Canberra, ACT 2601
ph: 02 62491560 fax: 02 62473227