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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Taphonomy Of Late Jurassic (Tithonian) Morrison Formation Apatosaurus Sp. Vertebrae Found Associated With Teeth From Allosaurus Sp. And Ceratosaurus Sp., And Body Size Extrapolation From The Associated Theropod Teeth., Greg C. Agyan
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
An Apatosaurus sp. locality from Dinosaur National Monument designated DNM-15 was excavated in 1985, and associated with two Allosaurus teeth and one Ceratosaurus tooth that were near one of the caudal vertebrae. The Ceratosaurus tooth was buried between an overlying rib and that same caudal vertebra. The caudal vertebrae of the DNM-15 Apatosaurus were intact and articulated, but the anterior skeleton was mostly absent, with a row of articulated sacral vertebrae in close association with a femur. Two other Allosaurus teeth were reported near the preserved ilium of the Apatosaurus, but they could not be located in the collections. …
Sediment Dynamics In The Bear River-Mud Lake-Bear Lake System, Patrick Belmont, Mitchell Donovan, Janice Brahney, Lindsay Capito, Zach Burgert
Sediment Dynamics In The Bear River-Mud Lake-Bear Lake System, Patrick Belmont, Mitchell Donovan, Janice Brahney, Lindsay Capito, Zach Burgert
Watershed Sciences Faculty Publications
The overarching goal of this project was to compile and analyze a variety of existing datasets, and generate several new datasets, to advance our understanding of how the Bear River Mud Lake-Bear Lake system functions, how it has, or is expected to change, identify which components are degraded or vulnerable to degradation, and determine if/where critical data and/or knowledge gaps exist. We conducted a series of analyses to evaluate changes in hydrology and suspended sediment, collected sediment cores from nine locations in Mud Lake to evaluate how sedimentation rates, sediment sources and water quality have changed over time, and utilized …
Long-Term Evolution Of Sand Transport Through A River Network: Relative Influences Of A Dam Versus Natural Changes In Grain Size From Sand Waves, David J. Topping, Erich R. Mueller, John C. Schmidt, Ronald E. Griffiths, David J. Dean, Paul E. Grams
Long-Term Evolution Of Sand Transport Through A River Network: Relative Influences Of A Dam Versus Natural Changes In Grain Size From Sand Waves, David J. Topping, Erich R. Mueller, John C. Schmidt, Ronald E. Griffiths, David J. Dean, Paul E. Grams
Watershed Sciences Faculty Publications
Temporal and spatial nonuniformity in supplies of water and sand in a river network leads to sand transport that is in local disequilibrium with the upstream sand supply. In such river networks, sand is transported downstream as elongating waves in which coupled changes in grain size and transport occur. Depending on the magnitude of each sand-supplying event and the interval between such events, changes in bed-sand grain size associated with sand-wave passage may more strongly regulate sand transport than do changes in water discharge. When sand transport is controlled more by episodic resupply of sand than by discharge, upstream dam …
Reducing High Flows And Sediment Loading Through Increased Water Storage In An Agricultural Watershed Of The Upper Midwest, Usa, Nate Mitchell, Karthik Kumarasamy, Se Jong Cho, Patrick Belmont, Brent Dalzell, Karen Gran
Reducing High Flows And Sediment Loading Through Increased Water Storage In An Agricultural Watershed Of The Upper Midwest, Usa, Nate Mitchell, Karthik Kumarasamy, Se Jong Cho, Patrick Belmont, Brent Dalzell, Karen Gran
Watershed Sciences Faculty Publications
Climate change, land clearing, and artificial drainage have increased the Minnesota River Basin’s (MRB) stream flows, enhancing erosion of channel banks and bluffs. Accelerated erosion has increased sediment loads and sedimentation rates downstream. High flows could be reduced through increased water storage (e.g., wetlands or detention basins), but quantifying the effectiveness of such a strategy remains a challenge. We used the Soil and Water Assessment Tool (SWAT) to simulate changes in river discharge from various water retention site (WRS) implementation scenarios in the Le Sueur watershed, a tributary basin to the MRB. We also show how high flow attenuation can …
Stratigraphy, Petrology, And Paleontology Of The Late Cretaceous Campanian Mesaverde Group In Northeastern Utah, Christopher Ward
Stratigraphy, Petrology, And Paleontology Of The Late Cretaceous Campanian Mesaverde Group In Northeastern Utah, Christopher Ward
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
This project examines a poorly studied sandstone ridge called Snake John Reef located 22 miles southeast of Vernal, in northeastern Utah. Previously this ridge was mapped as exposures of late Cretaceous, undifferentiated Mesaverde Group, and recently unidentified dinosaur fossils have been found along the ridge by the Utah Field House of Natural History State Park Museum. Stratigraphic sections, petrographic thin sections, and collection and study of fossils from Snake John Reef were undertaken to understand the stratigraphic relationship as well as to reconstruct the depositional environment of the dinosaur bearing units. Snake John Reef represents exposures of three late Cretaceous …
Quantifying Riverbed Sediment Using Recreational-Grade Side Scan Sonar, Daniel Hamill
Quantifying Riverbed Sediment Using Recreational-Grade Side Scan Sonar, Daniel Hamill
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The Colorado River in Glen, Marble, and Grand Canyons is subject to a complex regulatory framework, including the Colorado River Compact, the Endangered Species Act, and the Grand Canyon Protection Act of 1992. Physical, biological, and cultural resources are extensively monitored by the Glen Canyon Dam Adaptive Management Program (GCDAMP) to assess the effect of Glen Canyon Dam (GCD) operations on the downstream environment. The GCDAMP consists of a diverse group of stakeholders who identify priority resources and agree upon water releases at GCD. Large expenditures of money have been devoted to monitoring physical and biological resources in Grand Canyon. …
Stratigraphic, Microfossil, And Geochemical Analysis Of The Neoproterozoic Uinta Mountain Group, Utah: Evidence For A Eutrophication Event?, Dawn Schmidli Hayes
Stratigraphic, Microfossil, And Geochemical Analysis Of The Neoproterozoic Uinta Mountain Group, Utah: Evidence For A Eutrophication Event?, Dawn Schmidli Hayes
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Several previous Neoproterozoic microfossil diversity studies yield evidence for a relatively sudden biotic change prior to the first well‐constrained Sturtian glaciations. In an event interpreted as a mass extinction of eukaryotic phytoplankton followed by bacterial dominance, diverse assemblages of complex acritarchs are replaced by more uniform assemblages consisting of simple leiosphaerid acritarchs and bacteria. Recent data from the Chuar Group of the Grand Canyon (770‐742 Ma) suggest this biotic change was caused by eutrophication rather than the direct effects of Sturtian glaciation; evidence includes total organic carbon increases indicative of increasing primary productivity followed by iron speciation values that suggest …