Which major extinction event was caused by an asteroid collision and eliminated the majority of non-avian dinosaurs?

The major extinction event caused by an asteroid collision and eliminating the majority of nonavian dinosaurs is known as the Cretaceous-Paleogene extinction event. This event occurred approximately 66 million years ago when a large asteroid, estimated to be about 6 to 9 miles in diameter, collided with Earth in what is now the Yucatán Peninsula in Mexico. The impact released an enormous amount of energy, causing wildfires, tsunamis, and a global phenomenon known as an "impact winter," where sunlight was blocked, leading to a significant drop in temperature and reduced photosynthesis. These devastating consequences resulted in the extinction of about 75% of all plant and animal species, including the nonavian dinosaurs, marking the end of the Cretaceous period and the beginning of the Paleogene period.