| State | Arizona |
|---|---|
| Name | Pliocene to middle Miocene volcanic rocks |
| Geologic age | Middle Miocene to Pliocene |
| Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)
|
| Comments | Rhyolite to andesite associated with units Tby and Tb |
| References | Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.Lynch, D.J., Neogene volcanism in Arizona: the recognzable volcanoes, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 681-700.Nealey, L.D., and Sheridan, M.F., 1989, Post-Laramide volcanic rocks of Arizona and northern Sonora, Mexico, and their inclusions, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Diges |
| NGMDB product | |
| Counties | Apache - Coconino - Gila - La Paz - Maricopa - Mohave - Yavapai |