What is the black rock at sentinel rest area

Catherine Graff | Jun 29, 2020 | Category: Rest stop

Sentinel Rest Area Westbound - All questions

Address: I-8, Dateland, AZ 85333, USA

Catherine Graff | Jun 30, 2020

We thought it looked like volcanic rock.

Debra Hale | Jun 30, 2020

We wondered also,and think it's some kind of coal or hardened peat.

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