I'm enthused by the large number of recent posts since my last visit, I am glady this theory is finally being taken seriously by so many of our astute members.
However, I must address this issue of dinosaurs swimming from continent to continent, which has been brought to light by my colleague Mr Bishop.
Now, it's very clear that dinosaurs were excellent swimmers. See 2:40 in this clip from the Polish documentary Wędrowki z Dinozaurami:
Ridiculous as it looks in the video, this young Teropody Dinozaur is an adept island-hopper. I'm quite happy to accept that the dinosaurs were able to swim (in fact, I think it quite likely by virtue of their able seamanship).
What I'm concerned about, Tom, is how the dinosaurs were able to swim the Atlantic and the Pacific. It seems an impossible feat, even for the Michael Phelps of Dromaeosaurids. Such huge expanses of water are really only traversable with the use of maritime craft, and the ability to construct such sturdy craft as could cross the largest of the Earth's oceans seems to strongly suggest a mercantile, post-agrarian society.