Re: No Cretaceous placental mammals?

[K and T Dykes <ktdykes@arcor.de>]

<<ancestors of modern placental mammals were very small, and on total
conjecture probably hatched their eggs internally like some sharks do now.>>

I'd imagine, the most recent common ancestor of myself and a marsupial was
probably using a marsupial-like reproduction system, Rob; relatively
early-born, poorly-developed deliveries.  The oldest known eutherian (=
Placentalia plus more intimate relatives) is 125 million year old /Eomaia/
from Liaoning.  The pelvis has a rather narrow construction, and it's been
said that this wouldn't have allowed for the arrival of well-developed kids.
Cheers
Trevor

Mesozoic eucynodonts
http://home.arcor.de/ktdykes/meseucaz.htm
The Mesozoic - more than just the dinosaur