Arizona Geological Survey at the University of Arizona,
Coal Mine Mesa, situated ~12 miles southeast of Tuba City in northeast Arizona, owes its name to coal seams in the Cretaceous…
Coal Mine Mesa, situated ~12 miles southeast of Tuba City in northeast Arizona, owes its name to coal seams in the Cretaceous…
Hunting for Sinkholes on the Walhalla Plateau, northern…
FYI, George Billingsley