Badlands of northern Arizona's Chinle Formation

Ganado, Arizona | Badland erosion exposes colorful shales in the Chinle Formation, north of Ganado, Arizona. The geology of the Little Colorado River Valley in eastern Arizona, including Petrified Forest Nationa Park, is characterized by widespread exposures of Triassic and Jurassic terrestrial sedimentary rocks. The Upper Triassic Chinle Formation constitutes the bulk of non-Quaternary exposures within the Park. The Chinle Formation unconformably overlies the Lower- Middle Triassic Moenkopi Formation. Online Resource Martz, J.W., Parker, W.G., Skinner, L. and Raucci, J.J., 2012, Geologic Map of Petrified Forest National Park, Arizona. Arizona Geological Survey Contributed Map CM-12-A, 1 map sheet, map scale 1:50,000,18 p. http://repository.azgs.az.gov/uri_gin/azgs/dlio/1487