... why did it have to be a pile of sh-t?
https://arstechnica.com/science/2019/04/ancient-poop-tells-a-story-of-food-and-ritual-in-the-chihuahuan-desert/
Seriously, if a man was going to leave something behind and have it last over 1500 years I think a pile of sh-t wouldn't be what most people would want it to be.