Geological and geophysical investigations of an Apollo 9 photo anomaly near Point of Pines, Arizona

Abstract

An infrared photograph of southeastern Arizona, taken during the Apollo 9 multispectral terrain photography experiment in 1969, reveals a ringlike feature, some 3-4 miles (5-6 km) in diameter, on the Natanes Plateau, 35 miles (56 km) north of the town of Safford. Because the feature occurs in an area of nearly flat lying Tertiary volcanic rocks, the possibilities of its being a small collapse caldera or an exposed circular intrusive body vere considered. Geological and geophysical studies of the area were made to test these hypotheses. GEOLOGIC INVESTIGATION

Isotopic ages of post-Paleocene igneous rocks within and bordering the Clifton 1� x 2� quadrangle, Arizona-New Mexico

“…The western one-third of the Clifton 1° x 2° quadrangle consists largely of lands that are part of the Fort Apache and San Carlos Indian Reservations, for which detailed geologic studies are largely unavailable. However, a few ages for rocks in the Baldy Peak area-White Mountains volcanic center-in the northwestern part of the Clifton quadrangle (Merrill, 1974;Finnell et al, 1967) and for rocks in the Point of Pines and Bryce Mountain areas in the southwestern part of the quadrangle (Bromfield et al, 1972;Strangway et al, 1976) have been included in the compilation for completeness.…”