Really? You do know that 99% of all excavations are the recovery of stone tools (flaked material such as obsidian, jasper, chalcedony, and then pounding implements like manos, metates, mortars, etc.)? Then there are rock walls, round houses foundations, umicha foundations, midden, etc. Very few exacations are of any bone because the acid of the soil eats organic material. That is what creates midden - organic material that has melted into the earth and creates a black oily soil that indicates humans occupied that place.
Classic skeptic response. You don't have any idea what you are talking about, but still keep talking. Spare all the rest of us, because it's old and tired.