Introduction, Area of Study, and Geologic Data
Cenozoic geology and geologic history of Arizona is varied, complex, and widespread. Elements include the Mesozoic and Early Cenozoic Arc, Laramide structures, core complexes, volcanism, extension, and sedimentation. Each of these had an affect on middle Tertiary braided stream deposition in central Arizona, the main focus of this presentation. The following maps and diagrams provide data and background to understanding the Cenozoic geology of Arizona.
Map of physiographic provinces of Arizona
Location map of central Arizona (modified from Chalk Butte, Inc.)
Geologic map of central Arizona (Arizona Geological Survey)
Simplified geologic map of Central Arizona emphasizing map units relative to study
These columnar and panel sections show the Tertiary stratigraphy of central Arizona. In general, Tertiary deposits rest on older deposits from northeast to southwest across the region. Southwest of the Black Hills, Paleozoic rocks are absent and the Tertiary rests on Proterozoic rocks.
The Tertiary time-stratigraphic chart of Verde Valley and vicinity shows known and inferred age relations. The presumed correlation of conglomerates (gravels) is shown as are known clast compositions of the various units. Sedimentary deposits are known to be intercalated with basalts, but their distribution is poorly known.
Time-stratigraphic correlation chart of Middle Tertiary conglomerates in central Arizona
Simple geologic cross section of verde Valley area (Modified from Sanders, 1989)
Columnar and panel sections showing stratigraphic relations in central Arizona
Geologic map of Beavertail Butte area (Loseke and Blakey, unpublished data)
Detailed stratigraphic relations of Beavertail Conglomerate, Beavertail Butte area.
Detailed stratigraphic column of Beavertail Conglomerate, Beavertail Butte area.