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Re: Sci. Am. -present
Ronald Orenstein wrote:
>Actually, I am not sure why it is any more of a problem than (say) the
>absence (as far as I am aware) of undoubted monotreme fossils from the
>Mesozoic is for the view that these creatures represent an earlier offshoot
>of the mammal stock than marsupials and placentals.
Just for your knowledge, though this has nothing really to
do with dinosaurs or affect the birds-descending-from-theropods
theory, there is new molecular data (I apologize, I can't remember
who did the work so I have no reference) which suggests that
the monotremes should be placed within the marsupials.