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| Cedar Mesa Sandstone | |
|---|---|
| Name | Cedar Mesa Sandstone |
| Type | Geological formation |
| Age | Permian |
| Period | Guadalupian? Lopingian? |
| Primary lithology | Sandstone |
| Other lithology | Siltstone, mudstone |
| Region | Utah, Arizona |
| Country | United States |
| Underlies | Organ Rock Formation, Dewey Bridge Member? |
| Overlies | Cutler Group, Dean Formation? |
| Thickness | variable, up to several hundred meters |
Cedar Mesa Sandstone is a prominent Permian-aged geologic formation exposed across southeastern Utah, northeastern Arizona, and adjacent parts of Colorado and New Mexico. The unit is notable for extensive cross-bedded sandstone cliffs, prominent mesa-forming beds, and widespread preservation of eolian features that link it to regional units such as the Cutler Formation, Geraldine Formation, and the White Rim Sandstone. Researchers and land managers from institutions including the United States Geological Survey, University of Utah, Brigham Young University, and the Natural History Museum of Utah have documented its stratigraphy, sedimentology, and paleontology.
The Cedar Mesa Sandstone forms high-relief landscapes including mesas, escarpments, and fins adjacent to national protected areas such as Canyonlands National Park, Glen Canyon National Recreation Area, and Natural Bridges National Monument. Field descriptions emphasize thick, well-sorted, fine-to-medium-grained quartzose sandstone with large-scale planar and trough cross-bedding similar to eolian successions described from the Navajo Sandstone and Lubken Formation analogs. Mapping by the Utah Geological Survey and stratigraphers at Colorado School of Mines shows lateral continuity and facies changes tied to Permian paleogeography recognized in classic publications from the Geological Society of America and the American Association of Petroleum Geologists.
Stratigraphically the Cedar Mesa Sandstone is part of the greater Cutler Group succession in the Colorado Plateau; it typically overlies the Halgaito Formation or equivalent Permian units and is overlain by the organic-rich units of the Organ Rock Formation and younger Triassic strata such as the Moenkopi Formation and Chinle Formation. Lithologically it comprises quartz‑rich sandstone, subordinate siltstone and mudstone, and local carbonate cementation zones. Petrographic studies from teams at Stanford University and the University of Colorado Boulder identify mature detrital assemblages dominated by quartz with accessory feldspar and lithic fragments, and diagenetic features comparable to Permian reservoirs characterized in petroleum studies by the American Petroleum Institute.
Interpretations favor an eolian erg system with interdune and occasional sabkha or playa influence, analogous to modern deserts documented in studies by National Geographic Society and paleoclimatic reconstructions published by researchers affiliated with Smithsonian Institution and Scripps Institution of Oceanography. Sedimentary structures—large-scale cross-strata, grainflow deposits, wind-ripple laminae—and trace fossils align the unit with wind-dominated depositional settings comparable to the Navajo Sandstone erg and Permian dunes recorded in Zechstein analog studies in Europe. Facies alternations and ephemeral fluvial indicators connect to regional Permian paleorivers reconstructed by teams from Texas A&M University and the University of Texas at Austin.
Biostratigraphic, detrital zircon, and magnetostratigraphic data constrain the Cedar Mesa Sandstone to the Permian Period, broadly correlated with Guadalupian–Lopingian chronostratigraphy used in regional frameworks adopted by the International Commission on Stratigraphy. Correlations tie the unit to coeval beds in the Basin and Range Province and to the Permian sequences of the Ancestral Rocky Mountains foreland. Comparative work with European and Asian Permian units by researchers at the University of Oxford and University of Tokyo refines basin-scale timing and links to global Permian events such as the buildup to the Permian–Triassic extinction event.
Major exposures occur on Cedar Mesa and surrounding plateaus near Blanding, Utah, over the Comb Ridge monocline by Montezuma Creek, and in canyon country adjacent to Dead Horse Point State Park, Hovenweep National Monument, and the Moki Dugway region. Roadside and trail-accessible outcrops are studied by staff from Utah State Parks and volunteer groups such as the Sierra Club and Utah Friends of Paleontology. Mapping grids produced by the USGS and state geologic surveys document the formation across San Juan County, Utah, Kane County, Utah, and parts of Apache County, Arizona.
While not a major hydrocarbon reservoir at regional scale, the Cedar Mesa Sandstone has been evaluated for reservoir potential, groundwater storage relevant to municipal supplies in Blanding and Hanksville, Utah, and as a source of well-rounded sand used historically in local construction, with reports by the Utah Geological Survey and private consultancies. Paleontologically, its interdune and ephemeral-lag deposits preserve trace fossils, tracks, and rare plant remains studied by paleontologists at Yale University and the Field Museum of Natural History, contributing to reconstructions of Permian terrestrial ecosystems and ichnofaunas correlated with findings in the Cisuralian and regional tracksites cataloged by the Paleontological Society.
Exposures of the Cedar Mesa Sandstone lie within a mosaic of federal, state, and tribal jurisdictions including lands administered by the Bureau of Land Management, National Park Service, Ute Mountain Ute Tribe, and state agencies. Conservation priorities address visitor access, erosion control, archaeological site protection tied to Navajo and Ancestral Puebloan artifacts curated by the Smithsonian Institution and Bureau of Indian Affairs, and management plans coordinated with organizations such as the Sierra Club and The Nature Conservancy. Recreational climbing, hiking, and scientific research are regulated through permits and cooperative agreements with entities including the Utah Division of State Parks and local governments.
Category:Geologic formations of Utah Category:Permian geology of North America