Lichen growing on lava rock
Reddish lichen growing on this lava rock hastens the formation of new soil
Before this volcano erupted, there was fertile soil here - enough to support a group of prehistoric farmers and their families. Their fields are buried now beneath hundreds of feet of cinders, and the landscape has changed forever. New soil is forming, but it’s a slow and precarious process. Weathered particles and bits of organic matter must accumulate between the cinders in order for most plant species to germinate, survive, and reproduce successfully.

In the early stages of soil formation, this process is easily disrupted. Any disturbance can dislodge the particles and cause them to sift deeper into the cinders, where they may be out of reach for use by plants; plants already established may also be dislodged. For this reason, it is important for visitors to stay on designated trails.

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Mailing Address:

6400 U.S. 89
Flagstaff, AZ 86004


(928) 526-0502
Phones are answered during regular visitor center hours.

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