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Re: Gastric stones of dinosaurs were not for milling food !

there are obvious attractions for those who wonder how in the heck those
huge critters gathered enough leaf-mass in the course of 24 hours to
support themselves.

That "problem" has been solved long ago:

---------- By who?

Does that matter? Try GSP.

We talking models, or guess-timation?

Closer to the former. I'm sure it's all in the archives. As I wrote:

have a look at the size of a sauropod skull, and then take
into account that they didn't waste time
chewing. Not everyone is a mammal.

--------- I assume you refer to metabolism when you reference mammals.

No, it's in the same paragraph; I refer to chewing. Herbivorous mammals can't take in food and chew at the same time; they can only take in food when they've finished chewing a mouthful. Elephants spend most of every day chewing... judging from their teeth, sauropods did not.