Comet Storm - it took me well over an hour to read the whole thing, and that was broken up by a nap in the middle. Fascinating bit of research. If you don't have an hour to spend reading the whole thing, just read the first bit to get a flavour of what he's on about.
That led me to this album of pictures of Odessa Craters. I noticed that quite a few craters are near farmsteads etc - before aerial and satellite photography, did the people living there realise that part of their farm was an impact crater?
I also read this blog on huge floods. What spun me out is the idea that huge pot holes in the bassalt were caused by whirlpools of water.
Have a read of all of it. It's amazing how some people spend their days....