Tappan Age
Tappan Spring is a spring located in Tappan Spring Canyon in Coconino County, Arizona. Basalt rocks of Tappan age are named after flows from cinder cones north of the spring. Tappan-age rocks are from the period 0.2 to 0.7 myr.
References
- ^ U.S. Geological Survey Geographic Names Information System: Tappan Spring
- ^ Richard B. Moore; Edward W. Wolfe; George E. Ulrich (1976). "Volcanic rocks of the eastern and northern parts of the San Francisco volcanic field, Arizona". Journal of Research of the U.S. Geological Survey. 4 (5): 549–560.