You’re right. I should have said, “ferns and other non-flowering vegetation” instead of dinos. Flowers weren’t invented until roughly 140 million years ago. Dinos were around from about 230 million years ago (give or take) to about 65 million years ago (more than 60 million years before homo sapiens showed up). On Earth 2 there seems to have been a time warp with dinos still hanging around. But then, this is a comic strip where you can take great liberties to conjure up a good story.