Plot: When the Pteranodon kids decide to draw some maps, Don’s map of one big land mass for “the whole Mesozoic” triggers a discussion on whether the Mesozoic is “one big place that’s all connected” or comprised of a bunch of smaller, interconnected land masses. On the Dinosaur Train, the Conductor explains that millions of years ago there actually was just one big land mass called “Pangaea”! Then, over a long period of time, it started to drift apart and form separate, smaller landmasses, or continents