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Re: Segregated vs age-mixed sauropod herds
On Mon, Mar 15, 2010 at 5:36 PM, John Bois <firstname.lastname@example.org> wrote:
> I am thinking of very broad trends: animal body plans and strategies
> evolving most recently indicate higher parental investment: placentals
> compared to monotremes;
Isn't it quite possible that Monotremata and Placentalia (crown
clades) are around the same age?
> birds compared to basal dinosaurs;
What do we know about parental care in basal dinosaurs? (By "basal"
I'm assuming something like "pre-Late Jurassic"?)
> archosaurs compared to lizards.
Aren't the earliest squamate fossils Jurassic?
T. Michael Keesey
Technical Consultant and Developer, Internet Technologies