Growing up in Scotland I was familiar with the idea of large glacial movement shaping much of the vast mountain ranges we have here.
I thought I would look to see if there were any channels that would look like they were formed by the huge flood suggested by the comet impact hypothesis. This topographic representation of Scotland (linked) looks to me to be promising. Tempted to go and have a look for boulder fields in these parts/other evidence.
Any suggestions from members here that might be helpful/ productive.
All the best!
Siz