Massive Volcanic Eruptions Might Have Opened the Door for the Rise of Dinosaurs

Extinctions are tricky. Most people look at them as events that mark the end of life, giant disasters that are to be feared. That is true, but they also open the door for organisms that survive to spread and diversify. Without extinctions, mammals may not have risen because it was only after the passing of the dinosaurs that our ancestors could take over. So, did the dinosaurs get the same courtesy?