Dinosaurs, the Truth. When did the extinction occur?

The fossils speak... and tell the truth... and the indigenous people too... a viewer shared this A couple years aog I went to a dinosaur walk in Colorado, looking at footprints in the ’stone’ (which was most likely clay at the time). They presented some fossilized bones in the stone - and by that we are talking about a different color gradiant and a slight texture difference in the stone. The guy went on saying that those were a certain type of dinosaurs, that their skins were becoming blue when they were angry and their neck would swell, and all kinds of details that made no sense at all. I raised my hand, and asked: “And how exactly do you know all of this?“ After some hesitation, the guide said... “well, this was a theory from so and so... blabla and finally we don’t really know it, it’s just a guess.“ But he was there, selling this as holy truth... Have a great day! Marie