“All I know is the Triassic had dinosaurs. And cavemen!”
I believe that there were some early dinosaurs during that period, but it was a bit early for cavemen, 245 to 208 million years ago.
Just because the USGS says that deposits there that doesn’t mean they are commercially viable, but maybe so. After all much of the oil and gas being produced today wasn’t viable a few years ago. New technolgy and increasing prices can change everything.
Did they have global warming back then? I mean with all the dinosaur farts and all :)