There were no late Cretaceous sauropods in North America until the very end of the dinosaur age, when some titanosaurids moved north across the land bridge from South America...evidence indicates that Hadrosaurs and Ceratopians were the primary large herbivores in TRex's environment....to my knowledge no group burial of TRexes has yet been found that would provide evidence they lived in family groups (unlike the Giganotosaurs of South America, for which 2 mass burials have been unearthed, most likely courtesy of flash floods that drowned them)....
Thanks for giving me info on the geographical details of the sauropod distribution.
Provided the prey species is large enough, however, my other points still hold.
Was the typical hadrosaur large enough for one to feed a T-rex, (or group of velociraptors) or would there be left-overs?
If leftovers, then T-rex would have something worthwhile to scavenge on. I mean, a T-rex most likely wouldn't have been snacking on chipmunk-sized fare; those are teeth in its mouth not baleen.
Cheers!