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A Cryptobiotic soil is a biological soil crust composed of living cyanobacteria, green algae, brown algae, fungi, lichens, and/or mosses. -Wikipedia
It's that darker patch or bubbly earth at the bottom. If you see Cryptobiotic soil never step on it. It is a delicate ecosystem and will not recover quickly. *second photo is not from where I photographed my Crypto, I just thought you'd enjoy it :)
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We have similar posting! Very nice- most people dont know of the living soil out here.