This is Paisley Caves, in the desert of southern Oregon. There, Dr. Dennis Jenkins, aka Doctor Poop, found the oldest human coprolites, which I believe are 14,300 years old. He explained to me that, in the caves, he has also found the scat of American lions and other predators. My question to him was, “How do you know that these were pieces of human faeces and not humans that were eaten by American lions and then shat out in the caves?” His response was that either way, you’d know that humans were here. This is such a basic function: a human goes into a cave, craps, and leaves it there. This is a story of people arriving and leaving their sign behind.
When, How Did the First Americans Arrive? It’s Complicated. – National Geographic