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1) Just wondering... I've been told that the Two Medicine & Judith River Formations are actually the same formation, except that the two are now separated by a modern erosional arch. Does this mean that in those days in the Late Cretaceous, the fauna of both formations could have intermngled together?? I've always had this image that while the Judith River was predominantly low-lying floodplain, the Two Medicine was more of like a series of plateaus that effectively separated dinosaurs such as Maiasaura, Hypacrosaurus stebingeri, Einiosaurus & Achelousaurus from their Judith River cousins like Gryposaurus, Corythosaurus, Centrosaurus & Styracosaurus? So is it true that the fauna & flora of both formations were not so isolated?

I understand that different taxa would have different habitat preferences, with some keeping to the uplands, and others to the lowlands, but is it accurate to speculate that the fauna & flora of both areas would have constituted what amounted to an entire Great North American Ecosystem? (Just like the Africa in prehistoric times- the mopane woodlands of south-central Africa connected to the semi-deserts & veldt of southern Africa & the savannas of eastern Africa)

What I'm just implying is that while the fauna of both formations had different ranges, habitat preference etc etc, some taxa would be more generalised and inhabit virtualy every habitat in this ecosystem (think wolves in North America & Eurasia, & buffalo, leopard & olive baboons in Africa) Thus, some fauna would have been common to both formations.

Any comments? Would the fauna of both the Two Medicine & Judith River formations have intermingled with one another?

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