[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

RE: Segregated vs age-mixed sauropod herds

> Date: Mon, 15 Mar 2010 22:19:34 -0700
> From: tijawi@yahoo.com
> To: dinosaur@usc.edu
> CC: tijawi@yahoo.com
> Subject: Re: Segregated vs age-mixed sauropod herds
> T. Michael Keesey <keesey@gmail.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?
Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox.