Yes, dirt is very important. Species often only live where there is dirt perferred by that species. There does seem to be a fairly wide range. This is particularly true for the smaller ground dwelling species. Of course, not so important for tree dwellers, they need the right kind of tree.

Your dirt sounds like it has clay in it. Clay seals the dirt and makes it useless. If your look around washes and dry creeks, the organic matter and clay is washed out of it. Cheers

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