But this is NOT NEW

 

I'll admit that I read about this first in the Daily Mail in this article.  But I decided to be more scientific about it and get an article from Science News.

But before I do that, it has been known for a long time that the Deccan Traps volcanism preceded the Chicxulub impact, and probably caused climate and ecological stress. While some researchers have advocated that the Deccan Traps volcanism was the whole entire reason for the extinction, and Chicxulub was just a punctuation mark, a lot of them have said that the Deccan Traps set the stage and Chicxulub delivered the killing blow.

So this seems to be confirmation, rather than a big surprising breakthrough. 

New computer analysis hints volcanism killed the dinosaurs, not an asteroid

"But many scientists are not convinced that these findings provide the ultimate answer to this long-standing, complex question. “It’s an elegant way to address this problem,” says Sierra Petersen, a geochemist at the University of Michigan in Ann Arbor. Modeling in this way “gives the freedom to find the consensus solution, taking multiple proxy records into account. However, like any model, output depends on input.”

Petersen notes that foraminifera shells are not an ideal proxy for ancient temperatures: The oxygen isotope ratios in foraminifera shells can change not only due to temperature but also due to seawater composition. Different temperature proxies would likely lead to different patterns of gas release reproduced in models, Petersen says."

If you're not familiar with the Deccan Traps, the image below shows where they happened (in India) and what they look like today.  Somewhat similar to the layers of ash and lava visible in the Columbia River Gorge of Washington State, the result of the Columbia River flood basalt period.