[cogitator]

Deccan Trap volcanism preceded the Chicxulub impact for about 1 million years. I'd have to dig to find what I read recently downplaying the K/T extinction (wait... I'm going to give Google three changes)

This is close:

In Extinction Debate, Dinosaurs and Science Writers are the Losers

Princeton Paleontologist Produces Evidence For New Theory On Dinosaur Extinction

This is from 2003 and I thought I had seen something much more recent. Keller has published more recent stuff, so that may be what I'm thinking of. The jury is still out; I think the Chicxulub impact had to contribute, but how much ?

[Mike Darancette]

Deccan Trap volcanism preceded the Chicxulub impact for about 1 million years.

From: Astrobio.net;

At the time of the K−T extinction, India was an island located over the Reunion hotspot. Hotspots are fixed points where hot material from the mantle rises to the Earth's surface. This underground welling flooded portions of India with a vast amount of lava. Today, these cooled lava fields are called the Deccan Traps.

The slow outpouring of Deccan lava probably began a few million years before the K−T extinction. Then about 65 million years ago, the trickle became a torrent.