It is clear now that some of the largest fragments of the comet hit the North American ice cap, which was still a mile deep 12,800 years ago, and caused cataclysmic flooding (I had the opportunity to explore some of the extraordinary effects of this on the ground in September 2014 when I drove from Portland, Oregon, to Minneapolis, Minnesota, with catastrophist researcher Randall Carlson). Simultaneously other large fragments hit the northern E