crushed oreos!!!!!
and if don't want the white bits -- just twist them open and scarp out the filling! (be good -- don't indulge on the filling -- feed it to the cat and put the cat outdoors and watch it bounce off the trees for a while, so says the dog)
(in some stores in some areas they sell just the dark chocolate wafer cookies -- not a nabisco product -- but they are a bit hard to find)
if prefer brown dirt -- than any brown cookie or graham crackers can be used.
Also if you buy the box of pre-crushed oreos at the grocery store, it is crushed so finely, that you really don't see the white part.
maybe do a mixture of graham crackers and another darker brown colored cookie. Or heck, just get some oreos and a bunch of other brown cookies, crush them, and i;m sure you would end up with something that resembles dirt...
what about using crumbled brownies for dirt...ummmm i love brownies...darn it now i'm hungry 
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