Mgrre_Thinsections_12-A_18,
2022
Western Michigan University
Mgrre_Thinsections_12-A_30,
2022
Western Michigan University
Mgrre_Thinsections_12-A_49,
2022
Western Michigan University
Mgrre_Thinsections_12-A_50,
2022
Western Michigan University
Mgrre_Thinsections_12-A_57,
2022
Western Michigan University
Mgrre_Thinsections_12-A_1,
2022
Western Michigan University
Mgrre_Thinsections_12-A_56,
2022
Western Michigan University
Mgrre_Thinsections_12-A_3,
2022
Western Michigan University
Mgrre_Thinsections_12-A_8,
2022
Western Michigan University
Mgrre_Thinsections_12-A_12,
2022
Western Michigan University
Mgrre_Thinsections_12-A_14,
2022
Western Michigan University
Mgrre_Thinsections_12-A_78,
2022
Western Michigan University
Coastal Paleogeography Of The Pacific Northwest, Usa, For The Last 12,000
Years Accounting For Three-Dimensional Earth Structure,
2022
Oregon State University
Coastal Paleogeography Of The Pacific Northwest, Usa, For The Last 12,000 Years Accounting For Three-Dimensional Earth Structure, Jorie Clark, Jay R. Alder, Marisa Borreggine, Jerry X. Mitrovica, Konstantin Latychev
United States Geological Survey: Staff Publications
Predictive modeling of submerged archaeological sites requires accurate sea-level predictions in order to reconstruct coastal paleogeography and associated geographic features that may have influenced the locations of occupation sites such as rivers and embayments. Earlier reconstructions of the paleogeography of parts of the western U.S. coast used an assumption of eustatic sea level, but this neglects the large spatial variations in relative sea level (RSL) associated with glacial isostatic adjustment (GIA) and tectonics. Subsequent work using a one-dimensional (1-D) solid Earth model showed that reconstructions that accounted for GIA result in significant differences from those based on eustatic sea level. …
Coastal Paleogeography Of The Pacific Northwest, Usa, For The Last 12,000
Years Accounting For Three-Dimensional Earth Structure,
2022
Oregon State University
Coastal Paleogeography Of The Pacific Northwest, Usa, For The Last 12,000 Years Accounting For Three-Dimensional Earth Structure, Jorie Clark, Jay R. Alder, Marisa Borreggine, Jerry X. Mitrovica, Konstantin Latychev
United States Geological Survey: Staff Publications
Predictive modeling of submerged archaeological sites requires accurate sea-level predictions in order to reconstruct coastal paleogeography and associated geographic features that may have influenced the locations of occupation sites such as rivers and embayments. Earlier reconstructions of the paleogeography of parts of the western U.S. coast used an assumption of eustatic sea level, but this neglects the large spatial variations in relative sea level (RSL) associated with glacial isostatic adjustment (GIA) and tectonics. Subsequent work using a one-dimensional (1-D) solid Earth model showed that reconstructions that accounted for GIA result in significant differences from those based on eustatic sea level. …
Guidebook For Omaha's Urban Geology And Anthropocene Nebraska Well Drillers 2022 Field Trip,
2022
University of Nebraska at Omaha
Guidebook For Omaha's Urban Geology And Anthropocene Nebraska Well Drillers 2022 Field Trip, Harmon Maher, Ashlee L. Dere, Melina Luethje
Geography and Geology Faculty Books and Monographs
This geologic field trip focus is somewhat atypical but arguably reflects an ongoing evolution within the geosciences. Instead of traveling out into rural settings to look at outcrops and the stratigraphy exposed, or rural landforms and their geologic history, this field trip is focused on built and engineered environments in the Omaha area and the ‘modified’ associated geologic processes such as surface and groundwater flow, weathering, and soil formation. The ongoing evolution includes an increase in a multidisciplinary system science approach and is driven by a need to address environmental and resource management challenges using new tools and conceptual frameworks. …
Provenance Of The Northern Range, Trinidad Using Detrital Zircon U-Pb Geochronology: Implications For Northern South American River System Paleogeography,
2022
Augustana College
Provenance Of The Northern Range, Trinidad Using Detrital Zircon U-Pb Geochronology: Implications For Northern South American River System Paleogeography, Cheyenne Bartelt
Geology: Student Scholarship & Creative Works
The Northern Range of Trinidad is located in a key area for evaluating the Mesozoic-Cenozoic evolution of the Caribbean and South American plates. Here, we present detrital zircon U-Pb geochronology for 2391 grains from ten samples collected from metasedimentary rocks of the Northern Range. These data are used to bracket the maximum depositional age of the fossil-poor metasedimentary rocks from the Northern Range and to investigate the provenance of their sedimentary protoliths. Detrital zircon ages range between 3136.5 ± 22.9 Ma and 139.0 ± 5.4 Ma, reflecting apparent contribution from a variety of crustal affinities; however, since the youngest ages …
Deciphering Regional Geology Using The New Usgs-Ewu Mineral Separation Lab,
2022
Eastern Washington University
Deciphering Regional Geology Using The New Usgs-Ewu Mineral Separation Lab, Zachary Shimp, Katlin Gamache, Travis Morton, Chad Pritchard
2022 Symposium
U/Pb radiometric dating of zircon is one of the most widely used methods to determine the crystallization ages of igneous and metamorphic rocks and the provenance of sedimentary rocks. Eastern Washington University (EWU) has collaborated with the U.S. Geological Survey (USGS) to build a mineral separation lab for isolating zircon (and other) minerals for analysis. This lab was completed in Fall 2022 and is currently being transferred to the new ISC for future use. Graphically illustrated below are the methods used for sampling and pulverizing the rock, as well as grain mount preparation techniques. One of the EWU projects that …
Exceptional Agate Formation Found In Spokane Basalt,
2022
Eastern Washington University
Exceptional Agate Formation Found In Spokane Basalt, Matthew J. Markus
2022 Symposium
People don’t normally associate semi-precious gems with basalt or the “boring black rock” that dominates the Eastern Washington landscape. However, a site just northeast of Cheney in the West Planes of Spokane, shows where a system of gem-filled veins can be found nestled into the 16-million-year-old (Kasbohm and Schoene, 2018) Priest Rapids Member of the Wanapum Basalt that is a part of the greater Columbia River Basalt. The volcanic rocks are the host to millimeter - 10 cm wide fractures with variable colored agate and opal.
Detrital Zircon Ages In Heavily Folded Quartzite Compared To Steptoe Butte,
2022
Eastern Washington University
Detrital Zircon Ages In Heavily Folded Quartzite Compared To Steptoe Butte, Travis A. Morton, Chad Pritchard
2022 Symposium
Folded and altered quartzite along Interstate 90 and the Palouse to Cascades Trail out of Rosalia, WA preserves a record of the region’s tectonic past. The working hypothesis is that the sandstone is Cambrian (roughly 500 million years old) and was metamorphosed and deformed during the Sevier orogeny (roughly 150 to 50 million years ago), and then uplifted about 50 million years ago. The first step to address the hypothesis is to determine the age of the rocks using detrital zircon U/Pb analyses. The second step is for a detailed field study to identify relationships between metamorphic grades and geologic …
Species Effect On The Ecohydrology Of A Floodplain Forest In The Upper Mississippi,
2022
Macalester College
Species Effect On The Ecohydrology Of A Floodplain Forest In The Upper Mississippi, Claire Mchenry
Geology Honors Projects
The primary objective of this study is to understand how soil moisture is depleted underneath native and non-native Minnesotan tree species following a rain event. It is hypothesized that soil moisture will deplete more significantly and faster underneath drought intolerant, shallow rooted species native to Minnesota. This study also focuses on utilizing remote sensing techniques to calculate the soil moisture availability across a floodplain forest using Landsat 8 images to compare satellite-derived and field-recorded soil moisture values to assess the potential of these images to remotely estimate soil moisture in floodplains.
