It's not a traditional Pandea theory, which has the earth size holding constant, and the continents sliding about, beginning with one connected super-continent. Rather it's more like a slowly exploding egg theory.
Prior to the cataclism at 65 million years, all surface life on the planet would have been on the connected, raised bulge around the equator, resulting in world wide uniformity of land plants and animals. As it got close to 65 million years ago, and the earth spinned faster and faster, the centrifugal force would have counteracted the gravitational attraction of masses, allowing for increasingly large beasts, up to incredibly large dinosaurs shortly before 65 million years ago.
I know it’s a very different theory. That’s my point. There is a growing (though not GW-style political) consensus among astronomers and earth scientists that there was a collision 4.5 billion years ago that created the moon. You can find hundreds of articles on the net, both from science popularizer sites like the two I posted and from the scientific papers themselves in which a lot of peer-reviewed research points to the existence of that collision. Doesn’t make it absolute Truth, but it does carry a lot of weight.
Right now, like I said, this 65-million-year-ago story of the creation of the moon sounds like Däniken-style “science” to me.
Just my opinion. For what it’s worth, and all that.