It should be fine. I've used super generic dirt before with no problems. You'll want to at least sift out any large chunks (twigs, bits of wood or bark, that kind of thing.) Better is to do at least one step of mineralization prior to use. Saturate it completely, stir it around a good bit, then pour off the water. Spread the mud on a tarp and let it dry for a while. That should clear most of any urea or ammonium salts it might contain.