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Статті в журналах з теми "Geology – Uinta Mountains"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Sprinkel, Douglas. "The Palisades at Sheep Creek Canyon Geological Area." Geosites 1 (January 27, 2022): 1–10. http://dx.doi.org/10.31711/ugap.v1i1.95.

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The Palisades is an impressive ridge within the Sheep Creek Canyon Geological Area—an area nestled on the north flank of the eastern Uinta Mountains not far from Flaming Gorge National Recreation Area. Sheep Creek cuts through the Palisades, as well as the heart of the geological area, to reveal about 800 million years of geology, from ancient environments to the rise and ultimate erosion of the Uinta Mountains. The oldest rocks exposed at the Palisades comprise the upper part of the Neoproterozoic (about 770 million years ago) Uinta Mountain Group, which have been thrusted upon the Mississippian (about 350 million years ago) Deseret Limestone (equivalent to the upper Madison Limestone). That thrust fault and others exposed along the north and south sides of the Palisades are part of the Uinta thrust fault zone, which is responsible for intense folding of both formations. Although the uplift of the Uinta Mountains and related deformation along the Uinta fault zone set the stage for development of the Palisades, it was erosion that revealed and shaped this spectacular feature.

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2

Aslan, Andres, Marisa Boraas-Connors, Douglas A. Sprinkel, Thomas P. Becker, Ranie Lynds, Karl E. Karlstrom, and Matt Heizler. "Cenozoic collapse of the eastern Uinta Mountains and drainage evolution of the Uinta Mountains region." Geosphere 14, no. 1 (November 22, 2017): 115–40. http://dx.doi.org/10.1130/ges01523.1.

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3

Munroe, Jeffrey S., and Benjamin J. C. Laabs. "Multiproxy lacustrine records of post-glacial environmental change from the Uinta Mountains, Utah, USA." GSA Bulletin 132, no. 1-2 (May 2, 2019): 48–64. http://dx.doi.org/10.1130/b35056.1.

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Abstract Twenty-one sediment cores were obtained from 20 lakes in the Uinta Mountains, Utah, USA. Depth-age models were developed using 14C dating, and sediments were analyzed for loss-on-ignition (LOI), carbon-nitrogen ratio (C:N), and grain size distribution. Although some of these cores have been considered individually in previous studies, here the entire set of cores is evaluated collectively to identify consistent patterns, commonalities, and trends in the post-glacial interval. All lakes accumulated substantially greater amounts of submicron-size clastic material before ca. 9.5 ka BP. This pattern is interpreted as a signal of prolonged landscape instability following deglaciation. Values of LOI and C:N exhibit a strong, positive correlation in nearly all lakes, indicating that organic matter accumulation is controlled by the influx of terrestrial material. In the six lakes exhibiting the strongest correlation, and featuring the most robust inflowing streams, median grain size and the abundance of sand increased between 10 and 6 ka BP, simultaneous with increases in LOI and C:N. This correspondence is interpreted as evidence for frequent high-intensity storms during the early Holocene, likely driven by enhanced monsoonal circulation. The early parts of five of the records contain a sharp increase in LOI. Lakes exhibiting this pattern are typically smaller and shallower, and are located in less rugged watersheds. Finally, all six cores from the western Uinta Mountains contain evidence for an environmental perturbation ca. 4.5 ka BP. Although the nature of this event is unclear, these lakes accumulated notably finer-grained sediment with less organic matter at this time. This analysis illuminates the post-glacial history of this strategically located mountain range, and underscores the value inherent in analyzing cores from multiple lakes when reconstructing paleoclimatic history.

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4

Kelly, Marissa H., Alison M. Anders, and Sara Gran Mitchell. "Influence of bedding dip on glacial erosional landforms, uinta mountains, usa." Geografiska Annaler: Series A, Physical Geography 96, no. 2 (June 2014): 147–59. http://dx.doi.org/10.1111/geoa.12037.

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5

Kingsbury-Stewart, Esther M., Shannon L. Osterhout, Paul K. Link, and Carol M. Dehler. "Sequence stratigraphy and formalization of the Middle Uinta Mountain Group (Neoproterozoic), central Uinta Mountains, Utah: A closer look at the western Laurentian Seaway at ca. 750Ma." Precambrian Research 236 (October 2013): 65–84. http://dx.doi.org/10.1016/j.precamres.2013.06.015.

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6

Refsnider, Kurt A., Benjamin J. C. Laabs, and David M. Mickelson. "Glacial Geology and Equilibrium Line Altitude Reconstructions for the Provo River Drainage, Uinta Mountains, Utah, U.S.A." Arctic, Antarctic, and Alpine Research 39, no. 4 (November 2007): 529–36. http://dx.doi.org/10.1657/1523-0430(06-060)[refsnider]2.0.co;2.

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7

Nelson, S. T., J. D. Keith, K. N. Constenius, J. Olcott, E. Duerichen, and D. G. Tingey. "Genesis of fibrous calcite and emerald by amagmatic processes in the southwestern Uinta Mountains, Utah." Rocky Mountain Geology 43, no. 1 (May 1, 2008): 1–21. http://dx.doi.org/10.2113/gsrocky.43.1.1.

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8

Munroe, Jeffrey S., Emmet D. Norris, Gregory T. Carling, Brian L. Beard, Aaron M. Satkoski, and Lianwen Liu. "Isotope fingerprinting reveals western North American sources of modern dust in the Uinta Mountains, Utah, USA." Aeolian Research 38 (June 2019): 39–47. http://dx.doi.org/10.1016/j.aeolia.2019.03.005.

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9

Miller, Wade, and Dee Hall. "Earliest History of Vertebrate Paleontology in Utah: Last Half of the 19th Century." Earth Sciences History 9, no. 1 (January 1, 1990): 28–33. http://dx.doi.org/10.17704/eshi.9.1.72266661544wp27v.

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Aside from the recorded travels of Juan de Rivera in 1765 and the Dominguez-Escalante party in 1776, the earliest reports involving explorations into Utah were mostly those for proposed railroad lines and trade routes, or for general knowledge of the poorly known Western Territories (1840s to 1870s). These explorations were usually conducted under the auspices of the United States Army. Scientists, including geologists/paleontologists, commonly accompanied the survey parties. The first surveys whose prime objectives were to study geology and topography were commissioned by Congress in 1867. The earliest discovery of a vertebrate fossil in Utah apparently took place on the J. N. Macomb expedition of 1859 (which generally followed the Old Spanish Trail), when J. S. Newberry collected dinosaur bones in the southeastern part of the state. F. V. Hayden's 1870 survey may have extended into northernmost Utah. It is possible that a few of the Eocene age fossils which were reported by him from southernmost Wyoming, came from here. Fossils collected during the Hayden survey prompted a vertebrate fossil collecting trip headed by J. Leidy into the same area two years later. Also in 1870, O. C. Marsh discovered and named the Uinta Basin, making a significant fossil vertebrate collection there. Numerous Eocene mammals as well as reptiles and fish were collected in the Basin proper, while a turtle shell and dinosaur teeth were recovered from the upturned Mesozoic beds on the eastern rim of the Uinta Basin. A Jurassic crocodile humerus was found by Marsh along the eastern flank of the Uinta Mountains. In subsequent years before the turn of the century several institutions sent paleontological parties into this area. E. D. Cope in 1880 identified fossil fish and a crocodile from Eocene deposits of central Utah. Pleistocene mammals were first reported by P. A. Chadbourne (1871) and C. King (1878) from Salt Lake and Utah valleys. While early expeditions for vertebrate fossils concentrated largely on adjacent states, many of America's prominent 19th Century vertebrate paleontologists collected fossils in Utah. Their work pioneered the way for present-day paleontologists.

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10

Kieffer, Susan W. "Debris-fan reworking during low-magnitude floods in the Green River canyons of the eastern Uinta Mountains, Colorado and Utah." Geology 32, no. 1 (January 2004): e62-e62. http://dx.doi.org/10.1130/0091-7613-32.1.e62.

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11

Larsen, Isaac, John Schmidt, and Jennifer Martin. "Debris-fan reworking during low-magnitude floods in the Green River canyons of the eastern Uinta Mountains, Colorado and Utah." Geology 32, no. 1 (January 2004): e62-e63. http://dx.doi.org/10.1130/0091-7613-32.1.e63.

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12

Larsen, Isaac J., John C. Schmidt, and Jennifer A. Martin. "Debris-fan reworking during low-magnitude floods in the Green River canyons of the eastern Uinta Mountains, Colorado and Utah." Geology 32, no. 4 (2004): 309. http://dx.doi.org/10.1130/g20235.1.

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13

Munroe, Jeffrey S., and Benjamin J. C. Laabs. "Combining radiocarbon and cosmogenic ages to constrain the timing of the last glacial-interglacial transition in the Uinta Mountains, Utah, USA." Geology 45, no. 2 (December 8, 2016): 171–74. http://dx.doi.org/10.1130/g38156.1.

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14

Munroe, Jeffrey S., Benjamin J. C. Laabs, Jeremy D. Shakun, Brad S. Singer, David M. Mickelson, Kurt A. Refsnider, and Marc W. Caffee. "Latest Pleistocene advance of alpine glaciers in the southwestern Uinta Mountains, Utah, USA: Evidence for the influence of local moisture sources." Geology 34, no. 10 (2006): 841. http://dx.doi.org/10.1130/g22681.1.

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15

Hudson, Samuel M., Samuel A. Hillam, Joel Barker, Stephen T. Nelson, and Kevin A. Rey. "Pyrolysis of modern wetland sediment: extracting climate records from fens in the Uinta Mountains and Fish Lake Plateau, Utah, USA." Boreas 48, no. 3 (January 28, 2019): 810–24. http://dx.doi.org/10.1111/bor.12378.

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16

Weil, Arlo B., John W. Geissman, and James M. Ashby. "A new paleomagnetic pole for the Neoproterozoic Uinta Mountain supergroup, Central Rocky Mountain States, USA." Precambrian Research 147, no. 3-4 (July 2006): 234–59. http://dx.doi.org/10.1016/j.precamres.2006.01.017.

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17

Mueller, Paul A., David A. Foster, David W. Mogk, Joseph L. Wooden, George D. Kamenov, and James J. Vogl. "Detrital mineral chronology of the Uinta Mountain Group: Implications for the Grenville flood in southwestern Laurentia." Geology 35, no. 5 (2007): 431. http://dx.doi.org/10.1130/g23148a.1.

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18

Dehler, C. M., C. M. Fanning, P. K. Link, E. M. Kingsbury, and D. Rybczynski. "Maximum depositional age and provenance of the Uinta Mountain Group and Big Cottonwood Formation, northern Utah: Paleogeography of rifting western Laurentia." Geological Society of America Bulletin 122, no. 9-10 (May 20, 2010): 1686–99. http://dx.doi.org/10.1130/b30094.1.

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19

Vidal, Gonzalo, and Trevor D. Ford. "Microbiotas from the late proterozoic chuar group (northern Arizona) and uinta mountain group (Utah) and their chronostratigraphic implications." Precambrian Research 28, no. 3-4 (May 1985): 349–89. http://dx.doi.org/10.1016/0301-9268(85)90038-5.

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20

Dehler, Carol, George Gehrels, Susannah Porter, Matt Heizler, Karl Karlstrom, Grant Cox, Laura Crossey, and Mike Timmons. "Synthesis of the 780–740 Ma Chuar, Uinta Mountain, and Pahrump (ChUMP) groups, western USA: Implications for Laurentia-wide cratonic marine basins." Geological Society of America Bulletin 129, no. 5-6 (February 17, 2017): 607–24. http://dx.doi.org/10.1130/b31532.1.

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21

Sprinkel, Douglas A., Mary Beth Bennis, Dale E. Gray, and Carole T. Gee. "Stratigraphic setting of fossil log sites in the Morrison Formation (Upper Jurassic) near Dinosaur National Monument, Uintah County, Utah, USA." Geology of the Intermountain West 6 (November 1, 2019): 61–76. http://dx.doi.org/10.31711/giw.v6i0.36.

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The outcrop belt of the Upper Jurassic Morrison Formation in the northeastern Uinta Basin and southeastern flank of the Uinta Mountains is particularly rich in dinosaurian and non-dinosaurian faunas, as well as in fossil plants. The discovery of several well-preserved, relatively intact, fossil logs at several locations in Rainbow Draw and one location in Miners Draw, both near Dinosaur National Monument (Utah), has provided an opportunity to study the local paleobotany, stratigraphy, and sedimentology of the Morrison Formation in northeastern Utah. The Morrison Formation in northeastern Utah consists of four members. In ascending chronostratigraphic order, they are the Windy Hill, Tidwell, Salt Wash, and Brushy Basin Members. The lithology (including the presenceof glauconite grains) and fossil assemblage of the lower two members (Windy Hill and Tidwell) indicate a marine to marginal marine (coastal plain) depositional environment, whereas the lithology, fossil flora and faunaassemblage of the upper two members (Salt Wash and Brushy Basin) indicate a fluvial–lacustrine depositional environment. At least 10 fossil log sites in Rainbow Draw have been documented so far, and geologic mapping indicates that the logs and wood all occur in the same stratigraphic interval within the Salt Wash Member, approximately 17 to 27 m above the base of the member. The unit containing the logs and wood is about 11 m thick and consists of very fine to fine-grained sandstone and siltstone with indistinct bedding and no discernible sedimentary features.The logs are siliceous, some have a coaly exterior, and they range in exposed length from 0.5 to 11 m and reach diameters up to 1.1 m. In the Miners Draw area, a single siliceous log is documented in the upper part of the Salt Wash Member within a silty sandstone unit that is 4 m thick; its exposed length is about 6 m. Although the correlation of the Miners Draw log-bearing interval to the interval in Rainbow Draw is uncertain, both units are lithologically similar and both occur in the upper part of the Salt Wash Member. The logs have been identified as araucariaceous conifers that pertain to the same taxon originally described as Araucarioxylon hoodii Tidwell et Medlyn 1993 from Mt. Ellen in the Henry Mountains of southern Utah. Concurrent systematic work will prompt a nomenclatural transfer of this species to the genus Agathoxylon. Based on the abundance of large fossil logs and wood in the same stratigraphic interval in Rainbow Draw, wehypothesize that the area was covered by stands of moderately large trees of araucariaceous conifers. The sedimentological evidence suggests that the trees were not transported far from their original site of growth before they were deposited in a low-energy floodplain environment.

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22

Donald S. Stone. "Three-Step Palinspastic Restoration of a North-South Structural Cross Section through the Uinta Mountains: ABSTRACT." AAPG Bulletin 74 (1990). http://dx.doi.org/10.1306/20b22e8b-170d-11d7-8645000102c1865d.

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23

Henry W. Roehler. "Structural Development and Oil Occurrence on Northeast Flank of Uinta Mountains near Irish Canyon, Northwestern Colorado: ABSTRACT." AAPG Bulletin 69 (1985). http://dx.doi.org/10.1306/ad462a33-16f7-11d7-8645000102c1865d.

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24

FOUCH, THOMAS D., and JANET K. PITM. "Tectonic and Climate Changes Expressed as Sedimentary Cycles and Stratigraphic Sequences of the Paleogene Lake Uinta System, Central Rocky Mountains, Utah and Colorado." AAPG Bulletin 75 (1991). http://dx.doi.org/10.1306/20b241be-170d-11d7-8645000102c1865d.

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