*Moreover, the rocks, soils, flora & fauna of the aforementioned coasts are similar to each other or are actually of the same stock!

And thru radiometric dating, it was then determined that the last break-up of this BIG jig-saw puzzle a.k.a. "Pangaea" was +200 million yrs. ago just about the same time the dinos roamed the earth. (Pangaea means the super-continent!)

Now was it coincidence that the dinos came to existance when there was only 1 super-continent?

The answer is no 'coz with one huge landmass appeared one big habitat abundant with food thereby making the environment most favorable to the land species of the time.

Favorable as in - it provided the maximum & optimal growth for the dominant species of the time which were the dinos.