There are no mountains behind the Great Australian Bight.
Cambrian rocks occur in each of these districts, and they are best developed in the South Australian high= lands, where they include a long belt of contemporary glacial deposits.
Another point agreed upon is that the Australian flora is one of vast antiquity.
Of those peculiar to Australian waters may be mentioned the arripis, represented by what is called among the colonists a salmon trout.
A narrow Cambrian sea must have extended across central Australia from the Kimberley Goldfield in the north-west, through Tempe Downs and the Macdonnell chain in central Australia, to the South Australian highlands, central Victoria at Mansfield, and northern Tasmania.