Taken from the what you'll learn in this article section at the top:

1. Fossilized footprints in Saudi Arabia show human traffic on the cusp of a subsequent ice age.
2. Like carbon dating, scientists use isotopes and context clues to calculate the approximate age of fossils.
3. These human prints were surrounded by animals but not hunted animals, indicating humans were just thirsty.

My immediate thought as well.

That sounds like something out of a Douglas Adams book.