I am also amazed by amount of dirt, not by the fact it is covered (it came by process of top soil formation ); but by the sheer amount of it. If that was just a

I am also amazed by amount of dirt, not by the fact it is covered (it came by process of top soil formation ); but by the sheer amount of it. If that was just after 2-3 thousand years, it makes me wonder what other things can we dig which are much deeper? But again not prehistoric kind of deep, more in range of last million years.