Boy, I just read something weird: 13,000 years ago humans colonized California's Channel Islands. (EG. Catalina) Of course sea level was lower then so the islands were a single island only about five miles off shore. But the weird part is that there were still 6 foot high pigmy mammoths on the islands at that time! (Not for long, though. I assume they were good eating.) Paleontologists have found hundreds of fossilized mammoth remains on the islands, some almost completely intact. They have also found the earliest signs of humans in the contiguous 48 states.