The biogeographical isolation of Australia at a crucial time in mammalian evolution resulted in its being populated with a diverse array of marsupial mammals. Shortly before that, at the time of the mass extinction at the Cretaceous-Tertiary (K/T) boundary, Australia was

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At the time of the mass extinction at the K/T boundary, Australia was still connected to Antarctica as part of the southern supercontinent Gondwana. It was only later, around 50 million years ago, that Australia became biogeographically isolated due to continental drift.

The Biogeographical Isolation of Australia at a Crucial Time in Mammalian