If scientists were to find a large crater dated around the time of the dinosaurs what might it indicate about their extinction?

Many people actually believe that A large flood killed all of the dinosaurs, A large earthquake caused the crater that engulfed the dinosaurs, or A large volcanic eruption resulted in global climate change., but no. it was actually that of A large asteroid strike resulted in a massive explosion that altered plant life. It created an explosion so big that it basicly wipes out the entire species of dinosours!