[OokieWonderslug (OP)]

Since I can find no mention of this online I'll be the first. Flood basalts are caused by meteors impacting on the exact opposite side of Earth. The forces from impacts are concentrated at the opposing side of Earth. Anyone who has shot round targets full of sand has seen the bulge or white area on the opposite side of the sphere.

Where can you find impacts with matching basalts? The most obvious is the Indian traps. They were opposing Chixalub when they were active. Then you have the Siberian traps which line up well with The Wilkes crater in Antarctica. But what about the basalts in Washington state? A fellow member of this site found that crater not too long ago in Mongolia.  A small 15 mile wide crater. So the basalts in Washington were fairly small.

That this is the cause for these basalts seems beyond obvious. At least to me it does. Sort of like the reason why Macchu Piccu was built where it was. The answer is just beyond plain to see.

[Bored chemist]

Since I can find no mention of this online I'll be the first.

How hard did you look?
http://news.berkeley.edu/2015/04/30/did-dinosaur-killing-asteroid-trigger-largest-lava-flows-on-earth/

However it still looks to me like the Texas sharpshooter fallacy.

[OokieWonderslug (OP)]

I am ashamed of my google skills. I knew that India and Chixalub are not in perfect alignment. I just chalked that up to 65 million years of continental drift. It just seems obvious that as the shockwaves  from an impact spread out on a sphere they would all meet at the Antipode and melt some rock.