Quote Originally Posted by Rider View Post
But aren't Sauropods mostly of the long neck variety that need trees to eat from? (I am by no means a dinosaur expert)
Not necessarily. Sauropods were long-necked, but many were quite probably ground-grazers. However, there's still a problem. Specifically, there was little to no grass in the Mesozoic Era, certainly nothing like today's modern grasslands (which didn't come into being until the Miocene). Dinosaurs almost certainly cannot survive on modern vegetation.

This is really a fairly general principle: you can't transpose fauna without also transposing flora. There's only a handful of places on Earth today that have anything even close to a Mesozoic flora base (New Caledonia, portions of Tasmania).

There's also a climate problem. The Mesozoic Era, and especially the Cretaceous, was a hothouse world with no polar icecaps where temperatures rarely dipped below freezing even near the poles. Kansas, in this scenario, was under water. It's distinctly unclear if dinosaurs would be able to survive in anything like the continental climate conditions of the modern great plains.