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RE: Segregated vs age-mixed sauropod herds
> Date: Mon, 15 Mar 2010 22:19:34 -0700
> From: firstname.lastname@example.org
> To: email@example.com
> CC: firstname.lastname@example.org
> Subject: Re: Segregated vs age-mixed sauropod herds
> T. Michael Keesey <email@example.com> wrote:
>> Isn't it quite possible that Monotremata and Placentalia
>> (crown clades) are around the same age?
> That seems to be the conclusion of several recent phylogenetic studies. The
> respective crown clades of Monotremata and Placentalia, as well as
> Marsupialia, were all found to have emerged in the Cenozoic.
> In fact, one study has the crown Monotremata (the platypus + echidna clade)
> first appearing only 20 million years ago.
um...you mean 20 million years earlier, right?
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