hey Carl... coming in on this one way late but went back for a gander and all looks great.
Dunno if you ever worked with real dirt before. Nice thing about it is that it looks like dirt when you're done. I baked mine at 500 for about 30 minutes to kill anything in it. When you grind it... and use it... watch out for dust. Dried dirt does not have the clumping characteristics of pigments so dust can get every where, lungs included.