Geology Commons^™

Mgrre_Thinsections_Mgrre-151_3, Mgrre

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Mgrre_Thinsections_Mgrre-151_4, Mgrre

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Mgrre_Thinsections_Mgrre-152_11, Mgrre

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Mgrre_Thinsections_Mgrre-152_16, Mgrre

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Mgrre_Thinsections_Mgrre-152_29, Mgrre

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Mgrre_Thinsections_Mgrre-152_34, Mgrre

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Geochemistry And Petrography Of Upper Devonian (Famennian) Paleosols In The Appalachian Basin Of Central Pennsylvania, Usa, Cheyenne Woodward, Tami Emick, Lily Pfeifer, Jeff Trop

STEM Student Research Symposium Posters

To test the hypothesis of alpine glaciation in the late Devonian (Famennian) at subtropic latitudes, we present new major element geochemistry and petrographic thin section images from upper Devonian paleosols collected from north-central Pennsylvania (Appalachian Basin).  Paleosols, ancient soils, record climate conditions at the time of formation. Major element geochemistry is used to calculate the intensity of weathering which is used for paleoclimate interpretations, and microfabrics observed in paleosol thin section petrography yield important clues about the soil type and degree of pedogenesis in the system. Twenty-three samples were collected from the Catskill and Lockhaven Formation paleosols for geochemical analysis, …

Reconstructing Nebraska’S Late Quaternary Paleoenvironment, Landscape Change, And Human–Environment Dynamics Using Diatoms And Optically Stimulated Luminescence Dating, Gosia Mahoney

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation examines Holocene environmental change and human–environment interactions in the Nebraska Sand Hills by integrating geomorphic, paleoenvironmental, and geochronological data. It presents three complementary studies that together explore how climatic variability, local landscape processes, and human activity influenced environmental systems.

The first study reconstructs the early Holocene evolution of a dune-dammed valley in the central Sand Hills. Stratigraphic, sedimentological, and diatom evidence indicate that eolian activity resulted in a blocked fluvial system, leading to elevated groundwater levels and the formation of a wetland that later developed into a lake. Notably, this transformation occurred under relatively dry conditions, demonstrating that …

Mechanism Of Improved Miscibility Of Co2–Oil Systems By Multiester-Headgroup Surfactants, Ning Xu, Yanling Wang, Baojun Bai, Yu Zhang, Wenjing Shi, Zhaonian Zhang, Wenhui Ding, Peixu Ma, Zan Gao

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

In the pursuit of carbon neutrality, the CO₂-enhanced oil recovery provides dual benefits by enabling both carbon sequestration and incremental oil production. However, its application is limited by high minimum miscibility pressure. CO₂-philic and oil-affinitive surfactants have emerged as an effective, low-dosage, and cost-efficient strategy to reduce the minimum miscibility pressure. In this study, macroscopic phase behavior experiments combined with molecular dynamics simulations were employed to systematically elucidate the influence of multiester-head surfactants on CO₂–oil miscibility. Using a modified pressure–volume–temperature apparatus equipped with optical power monitoring, we determined that multiester-head surfactants reduced the first-contact …

Exploring Alternate Methods Of Flood Output Estimation During Natural Disasters, Finley Gardner

Honors College Theses

In April of 2025, extreme flooding damaged many homes and buildings of people across Kentucky. The Federal Emergency Management Agency (FEMA) produces maps that show the potential for flooding in areas around water bodies, but many of the April flooding damaged areas were well outside of the FEMA classification zones. The main purpose of this thesis research was to create an accurate model of potential flood extent in Kentucky and compare it to FEMA maps. This model did not require extensive computing power and produced a map that accurately depicted flood extent through the use of Digital Elevation Model (DEM) …

Plastic Purgatory: Investigating The Effects Of Plastic Litter On Water And Organic Content In Topsoil In Holland, Michigan, Kamryn Bice, Annis Cairns, Maddie Devries, Sebastian Lema

25th Annual A. Paul and Carol C. Schaap Celebration of Undergraduate Research and Creative Activity (2026)

Plastic accumulation in soils can offer important insights into how human activity affects terrestrial ecosystems. In this study, we examined the relationship between plastic litter and soil quality at several sites across Holland, Michigan to determine whether plastic abundance was associated with changes in soil properties. Soil samples from five different site types – construction, residential, commercial, nature, and a control – were collected over a threeweek period, then analyzed for pH, water contents, total organic carbon (TOC), and plastic abundance through field testing and laboratory methods. The number of plastic pieces ranged from 0 to 27 with the largest …

Mgrre_Thinsections_Mgrre-141_2, Mgrre

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Mgrre_Thinsections_Mgrre-141_3, Mgrre

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Mgrre_Thinsections_Mgrre-141_6, Mgrre

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Mgrre_Thinsections_Mgrre-141_7, Mgrre

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Mgrre_Thinsections_Mgrre-141_8, Mgrre

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Mgrre_Thinsections_Mgrre-141_9, Mgrre

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Mgrre_Thinsections_Mgrre-141_11, Mgrre

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Mgrre_Thinsections_Mgrre-141_12, Mgrre

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Mgrre_Thinsections_Mgrre-141_1, Mgrre

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