I think that the general scientific opinion has shifted to the idea that catastrophes have a significant impact, but that uniformitarian principles explain a lot for less exciting periods. SC, speaking of Catastrophes, when I pulled up the rest of the article, I noticed a link to serious NASA concern about large solar flares that you might want to post separately.
Regarding TR packs, I read a while back that they have a very large olfactory lobe which it is suggested could smell carrion as far as 20 miles away. Certainly their long legs would enable them to get there fast. So I guess one question is whether they were mixed scavengers/predators like a Hyena pack, or primarily hunters like a lion pride where the smaller females do a lot of the hunting with the big males dealing death blows to large prey. Of course, some other arrangement is also possible.
Yeah, weird, eh? A whole herd of Edmontosaurus (I think it was) found on a plain? Nope, not a death assemblage, they just happened to die and be fossilized numerous times over millennia. ;’)