May 11- History

History is such a massive subject, sometimes it is difficult to delve deep into the catacombs of my brain to come up with a sufficient question for Mondays. So for my question today, I am going to ask a question about... PRE-history. A pre-historic question? Is this even possible? Alas my friends, it is, so with that sentiment I will be asking my question about Dinosaurs. Since science was making leaps and bounds in the 1700's, and fossils were being found, Dinosaurs became a hot topic. Were they cold or warm blooded? Tail carried up or down? Most of this we still don't know, but paleontologists (dinosaur researchers) are coming closer to finding the answers every day. (If you don't believe me, check out the New York Museum of Natural History) Anyway, one thing we were able to figure out over time was how to classify things using time periods. Scientists and historians just loving doing that. (Think Bronze Age, Romantic Era, Gilded Age) So even though you might think this question comes out of left-field, it really doesn't, considering all the things we use time periods for. And with that, I present this question: What are the three main periods in which Dinosaurs roamed the Earth?





The three are listed from most recent to least recent:
Cretaceous 65-145 million years ago
Jurassic 145-208 million years ago
Triassic 208-245 million years ago