Not individual deposits but from waste treatment runoff.
Random fact: scientist have managed to track the prosperity of the Mississippian people by measuring the relative effects of human poop in sediment from a number of old oxbow lakes.
Random fact #2: the sewers of Pompeii are rife with ancient poop, which has yielded a wealth of information about their diet.
The people may be castings but the last ones they squeezed out are still with us.
If trumper’s were given the choice to receive a primary residence in either San Francisco or Mississippi but the only condition was that they had to live in it for their lifetime I wonder what they would choose
If money is no object, I would deal with the haters and live S.F. Hopefully in a poop free zone. One quick question. What would they have me do with my firearms?