It is unclear from my preliminary research reading whether the Deccan Traps were erupting in this extreme way prior to the collision. It seems that the massive eruption may have already been going on for some time starting a slow die off of Late Cretaceous fauna caused by global warming as an after effect of the eruption.
One interesting piece of evidence is the Shiva crater - apparently another impact crater of the west coast of India and at the KT Boundary. That's two craters in the same time frame - relatively speaking. Could the collision have been a multi-impact event like the one that hit Jupiter a few years ago? Other than it being described as large, the Shiva crater's dimensions are not mentioned in detail. Is it larger than Chicxulub or smaller? Did both impacts occur together or with a long time period between?
Even with the Deccans erupting prior to impact, the global warming effect would take place over an extended period of time. Most animals and other organisms would surely have had time to adapt or move to better territories. Those most directly and immediately affected would be those living in the region of the Deccan Traps.
Much to think about and more to learn...
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The oil drilling company owns the Mumbai Heights huge oil reserves,Shankar Chatterjee can not even prove his ideas,Gerta Keller works with the idea of multiple hits as seen in Shoemaker-Levy 9,the most important item is the WHOLE Indian continent SPEEDED UP after the meteor hit the continent. The deccan flat volcanos are the size of our Oregon & Washington states together,and are the primary end of dinosaurs and set the ecology for mammal evolution in the tethys marshes up to 10 million years ago
I guess it would be helpful to study the DVP directly and by what you are saying, that might be impossible. However, an oil drilling company might have stratigraphic info that could be helpful. Also, a topographic profile might shed some light on the site - esp. since the layers are significantly thicker to the west compared to the east. There is also the matter of the conductivity variance along the same gradient - but these may be tectonic in nature. The ash layer has most of the keys to the puzzle - esp. as to which happened first. It is true that the Deccans already existed prior to the KT Event and were erupting. The key question is: did the impact or series of impacts intensify the DVP? Also, what was the time between impacts? There are two impact craters within the same timeframe. Most of the evidence points to the Yucatan with the layer thickening closer to it, which makes sense. If the time between impacts was within say a week of each other - then it would be a multiple hit event. If they were years apart, we have a different situation but with the same end. The evidence should show this. I guess the first thing is to determine which ash is at the base of the KT Layer - impact ash or DVP ash - then analyze upward.
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