You’re thinking of the carboniferous period, which was 50 million years before the start of the triassic period, and 250 million years before the end of the cretaceous period. Here’s the timeline:
Trees be chilling and making oxygen and turning into coal
Bugs show up and use the rich oxygen to grow huge
Amphibians come onto land and say what’s up
Bugs and amphibians use up the rich oxygen and start eating the plants
Dinosaurs evolve from amphibians AFTER the oxygen level has dropped
Dinosaurs spend the next 200 million years being the dominant land animals until the asteroid shows up
Mammals kick ass because they can deal with the cold better than those cold blooded reptiles
Very smart mammals invent petroleum and plastic and warm the globe up until there’s a mass extinction event and the decimation of mammal life
Dinosaurs evolve again because it’s nice and warm again
You’re thinking of the carboniferous period, which was 50 million years before the start of the triassic period, and 250 million years before the end of the cretaceous period. Here’s the timeline:
Trees be chilling and making oxygen and turning into coal
Bugs show up and use the rich oxygen to grow huge
Amphibians come onto land and say what’s up
Bugs and amphibians use up the rich oxygen and start eating the plants
Dinosaurs evolve from amphibians AFTER the oxygen level has dropped
Dinosaurs spend the next 200 million years being the dominant land animals until the asteroid shows up
Mammals kick ass because they can deal with the cold better than those cold blooded reptiles
Very smart mammals invent petroleum and plastic and warm the globe up until there’s a mass extinction event and the decimation of mammal life
Dinosaurs evolve again because it’s nice and warm again