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| Kayenta Formation | |
|---|---|
| Name | Kayenta Formation |
| Type | Formation |
| Age | Early Jurassic |
| Period | Jurassic |
| Region | Colorado Plateau |
| Country | United States |
| Underlies | Navajo Sandstone |
| Overlies | Wingate Sandstone |
Kayenta Formation The Kayenta Formation is a geological unit on the Colorado Plateau of the United States noted for its Early Jurassic age, fossil content, and role in regional stratigraphy. It crops out across parts of Arizona, Utah, Colorado, and New Mexico, and is a key horizon in landscapes such as Grand Canyon National Park, Zion National Park, and the Paria Canyon-Vermilion Cliffs Wilderness. The unit records fluvial, lacustrine, and eolian interactions and has been studied by researchers from institutions including the United States Geological Survey, the Smithsonian Institution, and universities such as University of Utah and Harvard University.
The formation sits between the underlying Wingate Sandstone and the overlying Navajo Sandstone within the regional Early Mesozoic succession; this relationship is important to stratigraphers from the Geological Society of America and the American Museum of Natural History. Stratigraphic work by geologists using sections near Tuba City, Arizona, Moab, Utah, and the Shinumo Creek area in Grand Canyon National Park has clarified its lithostratigraphic boundaries and facies architecture. Correlation studies reference regional markers such as the Kayenta Member of broader units, tie into magnetostratigraphy projects led by teams at California Institute of Technology and the University of Oxford, and inform basin analysis tied to the Ancestral Rocky Mountains and the Cordilleran orogeny.
Sedimentologists describe the unit as composed of interbedded sandstones, siltstones, mudstones, and occasional conglomerates; petrologic analyses have been performed by laboratories at Stanford University, University of California, Berkeley, and the Colorado School of Mines. The sandstones exhibit planar and cross-bedding studied in outcrops at Cedar Mesa, Vermilion Cliffs, and Paria Plateau, while paleosol horizons and caliche nodules have been documented by teams affiliated with Yale University and the University of Chicago. Grain-size distributions, thin-section petrography, and heavy-mineral studies cite provenance links to sources such as the Ancestral Rocky Mountains and volcanic inputs correlated with episodes recorded in the Cordilleran magmatic arc.
The formation yields a diverse assemblage of vertebrate and invertebrate fossils that have been curated by collections at the Natural History Museum, London, the Smithsonian Institution, and the Museum of Northern Arizona. Body fossils include early theropod traces and skeletal elements analogous to taxa discussed in works by paleontologists from Harvard University and the University of Chicago, as well as pterosaur and sphenodontian remains compared with specimens from Lyell-era collections. Ichnofossils—trackways and footprints—have been intensively documented at sites visited by researchers from the University of Colorado Boulder and the University of Michigan; these ichnofaunas are interpreted alongside plant fossils and palynomorphs curated at the New York Botanical Garden and tied into macrofloral assemblages similar to those published by teams at the Field Museum of Natural History.
Biostratigraphic, radiometric, and magnetostratigraphic data place the unit within the Early Jurassic (Hettangian to Pliensbachian to Toarcian intervals in some studies), with dating efforts involving laboratories at the U.S. Geological Survey, Massachusetts Institute of Technology, and the University of Cambridge. Correlation frameworks link the unit to contemporaneous strata such as the Kayenta equivalents in the Colorado Plateau basin and tie into continental-scale syntheses that include the Sundance Formation and equivalents across western North America documented by the Geological Survey of Canada and the British Geological Survey.
Research interprets deposition in fluvial channel, floodplain, and ephemeral lacustrine settings within an overall semi-arid paleoclimate; these interpretations have been developed by teams associated with the University of Arizona, Pennsylvania State University, and the University of Texas at Austin. Features such as multi-storey channel sandbodies, overbank mudstones, root-trace-bearing paleosols, and crevasse-splay deposits are compared to modern analogs studied by researchers at the Smithsonian Tropical Research Institute and cited in comparative sedimentology treatises published by the International Association of Sedimentologists.
The formation contributes to regional groundwater aquifers and outcrop exposures that support tourism to protected areas managed by the National Park Service and the Bureau of Land Management. Its scenic cliffs and ledges form iconic vistas in parks like Zion National Park and Grand Canyon National Park, attracting academics from institutions such as Princeton University and Columbia University and serving as outdoor laboratories for field courses from the University of California, Los Angeles and the University of New Mexico. Paleoenvironmental datasets from the unit inform broader studies published in journals associated with the American Geophysical Union and the Royal Society.