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Sauropod gastroliths

Good morning, all! 

I was reading Robert Bakker's "Dinosaur Heresies" today and am curious
about the Sauropod gastrolith issue.
Bakker, as well as many other Paleontologists, theorize that the giant
megaton Sauropods purposely ate stones to help aid in the digestion of
tough plants. 
However, I stumbled across this article online from 2007:

What is the most accepted theory today about Sauropods and the use of

Ashley Fragomeni
Natural History Museum of Los Angeles County
Los Angeles, CA 90007