http://www.sciencemag.org/news/2019/02/did-volcanic-eruptions-help-kill-dinosaurs

The hardened lava flows of the Deccan Traps, in western India, may have played a role in the demise of the dinosaurs.

What killed off the dinosaurs? The answer has seemed relatively simple since the discovery a few decades ago of a large impact crater in the Gulf of Mexico. It pointed to a massive asteroid strike 66 million years ago that unleashed towering tsunamis and blotted out the sun with ash, causing a plunge in global temperatures.