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Re: Australian mammal remains

>The specimen is a placental, possibly the worlds oldest. It is not a rodent
>which are relatively advanced mammals. The specimen cosists of a lower jaw
>with premolars and molars still attached. As always, the Science Show on
>Radio National gace tyhe best coverage.

Stupid (but probably very common) question.  What is it about half a lower
jaw that tells you its a placental mammal?  

The Australian Broadcasting Co. website has some good illustrations  from
several angles, for anyone who hasn't seen them.

  --Toby White