Its a good question that I independently studied some years ago. It’s not possible under normal conditions, it is not impossible but not possible under naturally occurring circumstances, it breaks the creative-natural laws of the universe or ‘creation’ if you prefer that word. We do have several legacies of the dinosaur on Earth today before I explain, in the Congo Africa, and the Scottish deep lochs etc., but these are isolated incidences, an exotic exception, and in terms of the taxonomical dino’s these are more in keeping with our time today, they adapted etc. There is cases where say an extraterrestrial group goes to live on a world with dinosaurs, that is possible, but very rare that extraterrestrials would be this stupid, and thus if that stupid then some thousands of years of stagnation pass, they degenerate and loose their technological abilities, like the egyptians say, but more like king kong tribe style, they become completely wild humans again returning back to very primitive stages of development again, then a visitor comes along in a spaceship and says ‘oh look there’s humans living with dinosaurs’, this is not a natural arrangement by nature, they developed cognitively and consciously and of their own volition when to a planet at the gigantism stage of evolution when the atmosphere is sluicing with high levels of gases poisonous to advanced humans, and then these extraterrestrials degenerate due to the air not being suitable and congruent with a healthy human development. Dinosaurs occur at a different time to humanoids in a planets development. But it can be arranged artificially as I have explained several ways and means. This is why the jurassic park franchise was so successful, because folks enjoy not-truth more than truth, in fact the truth is far too banal and boring for commercial resale, you can’t even give the truth away, folks will throw it back in your face if its too loaded with truth.