upperbeaver_paleo.html


Paleogeography of Central Arizona during deposition of upper unit of Beavertail Conglomerate and related deposits.

General topography remained similar to that of the older deposits of the Beavertail Conglomerate but this was clearly a time of widespread stream aggradation. Braided stream deposits accumulated in the strike valley as well as in major tribitaries. Latite clasts are the only significant Tertiary volcanic material in the unit so the deposit is clearly mostly pre-Hickey Basalt (16-12 Ma). During this interval, topography in the Transition Zone was probably lowered by erosion and crustal thinning associated with extension to the SW (Reynolds and Spencer (1989). Towns: F - Flagstaff, S - Sedona, C - Cottonwood, CV - Camp Verde, Ch - Chino Valley, P - Prescott