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| Harrison Uplift | |
|---|---|
| Name | Harrison Uplift |
| Location | United States |
Harrison Uplift The Harrison Uplift is a regional structural high in the western United States noted for its pronounced anticlinal expression and erosional escarpments. It is situated within a complex of basins and ranges that include well-known physiographic provinces, and it has attracted study by geologists from major universities and agencies. The feature influences drainage and landscape development near several national parks and federal lands.
The Harrison Uplift lies near the intersection of the Rocky Mountains, the Great Basin, and the Colorado Plateau, bordering counties administered by state governments and adjacent to federal lands managed by the United States Forest Service, National Park Service, and the Bureau of Land Management. Nearby towns and cities include Salt Lake City, Denver, Grand Junction, and Provo as regional population centers providing access for field parties from institutions such as Stanford University, University of Utah, Colorado School of Mines, and University of Colorado Boulder. Major transport corridors crossing the region include Interstate 70, Interstate 80, railroad lines operated historically by the Union Pacific Railroad and the Denver and Rio Grande Western Railroad, and airports serving Salt Lake City International Airport and regional airfields. The uplift affects headwaters for tributaries of the Colorado River, Green River (Colorado River tributary), and smaller drainage basins studied by researchers from agencies including the United States Geological Survey and the Environmental Protection Agency.
The uplift is expressed as an anticlinal structural high formed during episodes of crustal shortening and later modified by extensional tectonics associated with the evolution of the Basin and Range Province and interactions with the Laramide orogeny and Sevier orogeny. Lithologic assemblages record deposition from Paleozoic through Cenozoic intervals correlated with chronostratigraphic frameworks used by the Geological Society of America, with field synthesis published by researchers affiliated with the American Geophysical Union and in bulletins issued by the USGS. Regional metamorphic and igneous events tied to magmatism associated with the Snake River Plain and the San Juan volcanic field influence interpretations of the uplift’s genesis. Comparative studies reference methods developed at Massachusetts Institute of Technology, California Institute of Technology, and the University of Cambridge.
Structurally, the Harrison Uplift comprises a complex of thrust faults, reverse faults, normal faults, and high-angle shear zones mapped in detail by teams from the United States Geological Survey, State Geological Surveys, and academic groups including Princeton University and Yale University. Its tectonic history includes Laramide-aged shortening, Middle to Late Cenozoic extension associated with the Basin and Range Province, and late-stage uplift potentially linked to mantle dynamics beneath the North American Plate and the motion of the Pacific Plate. Seismic profiles and gravity surveys by the United States Seismic Hazard Map program and studies from the Incorporated Research Institutions for Seismology have imaged crustal architecture resembling structures documented in the Wasatch Range and the Uncompahgre Uplift. Structural traps and fold geometries have been interpreted using techniques from the Society of Exploration Geophysicists.
Stratigraphic columns across the uplift record sequences of Cambrian through Cenozoic strata, including carbonate platforms comparable to those in the Mesozoic Western Interior Seaway, siliciclastic successions analogous to the Burgess Shale-age deposits in terms of preservation style, and volcaniclastic units resembling the ash flow tuffs of the Cretaceous and Paleogene. Major rock types include limestone, dolomite, sandstone, shale, conglomerate, and intrusive bodies of granite and diorite similar petrologically to plutons of the Batholith of North America. Correlation frameworks reference zonations used by the International Commission on Stratigraphy and regional biostratigraphic markers described in monographs from the Smithsonian Institution.
Fossil occurrences reported from strata on the uplift include marine invertebrates such as brachiopods and trilobites comparable to faunas in the Burgess Shale and Bonneterre Formation, vertebrate assemblages including early fish and tetrapod remains analogous to collections held at the American Museum of Natural History and the Natural History Museum, London, and plant fossils comparable to floras documented by researchers at the Field Museum and the Royal Botanic Gardens, Kew. Trace fossils and ichnofossil horizons inform paleoenvironmental reconstructions used by paleontologists affiliated with Harvard University and University of California, Berkeley. Paleontological work has been coordinated with curators from institutions such as the Smithsonian National Museum of Natural History.
The uplift has been prospected for mineralization including base metals, precious metals, industrial minerals, and hydrocarbons by companies historically linked to the Anaconda Copper, Newmont Corporation, and junior exploration firms operating within mineral districts recognized by the United States Bureau of Mines and the Nevada Division of Minerals. Mineral deposits include vein-hosted gold-silver systems with structural controls akin to deposits at Butte, Montana and porphyry-style mineralization reminiscent of the Bingham Canyon Mine. Aggregates, dimension stone, and potential geothermal resources have attracted interest from state energy offices and the Department of Energy. Regulatory oversight and permitting involve agencies such as the Bureau of Land Management and the Environmental Protection Agency.
Environmental concerns on and around the uplift include habitat connectivity for species managed by the United States Fish and Wildlife Service, impacts on watersheds supplying downstream users including states party to the Colorado River Compact, reclamation of legacy mine sites addressed by the Environmental Protection Agency Superfund program, and land-use planning coordinated with the National Park Service and state agencies. Conservation initiatives have been led by non-governmental organizations such as the Nature Conservancy and regional land trusts, while interdisciplinary research collaborations involve the Smithsonian Institution, National Science Foundation, and university research centers to balance resource use, cultural heritage preservation involving indigenous groups, and ecological resilience.