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Re: No Cretaceous placental mammals?
On 6/22/07, Dino Guy Ralph <email@example.com> wrote:
Jeff Hecht writes:
"It is curious that living birds seem to have originated well before the
K/T, in contrast to mammals."
If you'll forgive the Linnaean vernacular, I think that Jeff Hecht meant to
say something along these lines:
"It is curious that extant orders of birds seem to have originated well
before the K/T, in contrast to extant orders of mammals."
That's even less curious than my interpretation (that he meant
"placentals" instead of "mammals"), since it's essentially
meaningless. "Order" doesn't have a good definition, but, when it
comes to birds and mammals, you almost could define it as "any of
certain clades originating in the early Cenozoic or Late Cretaceous".