There is tons of stuff out there. Its a thing in construction that you dont have to worry about anything archaeological below X feet because X represents the

There is tons of stuff out there. Its a thing in construction that you dont have to worry about anything archaeological below X feet because X represents the lowest we have found human remains(Clovis). But everybody involved with digging has stories about finding stuff way below that layer. And they just cover it up because nobody wants the job to be stopped.