Geology of Carrizo Valley, Southern Apache County, Arizona
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A detailed geologic map of a 195-square-mile area in eastern Carrizo Valley shows outcrops of Upper-Triassic Chinle Shale, Upper-Cretaceous Dakota Sandstone, Mancos Shale, and Mesaverde Sandstone, late Pleistocene Richville Formation, and younger Quaternary deposits of basalt, travertine, terrace gravels, and alluvium. Notably absent are Jurassic and Lower-Cretaceous and possibly Lower-Triassic rocks. In the subsurface above the Precambrian basement are the Permian Abo Redbeds, Yeso Redbeds, Coconino Sandstone, and San Andres Limestone. Carrizo Valley is synclinal. The ancestral late Pliocene or early Pleistocene drainage was filled to a depth of several hundred feet by the late Pleistocene Richville deposits. The ancestral valley has been subsequently exhumed.