Physical Sciences and Mathematics Commons^™

Changes In Geologic Time Understanding In A Class For Preservice Teachers, Rebecca Teed, William Slattery

Earth and Environmental Sciences Faculty Publications

The paradigm of geologic time is built on complex concepts, and students master it in multiple steps. Concepts in Geology is an inquiry-based geology class for preservice teachers at Wright State University. The instructors used the Geoscience Concept Inventory (GCI) to determine if students' understanding of key ideas about geologic time and Earth history changed between the first and last day of the course. For three of the four GCI questions analyzed in this study, the number of correct student responses increased significantly between the pretest and the post-test, indicating that many of the students were learning the concepts being …

The Kozeny-Carman Equation Considered With A Percolation Threshold, Lee Brenson Porter Ii

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A procedure has been developed for calculating permeability (k) from the Kozeny-Carmen equation, a procedure that links ideas from percolation theory with the ideas of Koltermann and Gorelick (1995) and Esselburn et al. (2011). The approach focuses on the proportion of coarser pores that are occupied by finer sediments and defines a threshold proportion. For proportions below this threshold, the unoccupied coarser pores percolate. Following the ideas of Koltermann and Gorelick (1995), the effective grain-size term in the Kozeny-Carman equation is calculated using the geometric mean if below the threshold proportion, and with the harmonic mean if above. Following ideas …

Analysis Of An Eocene Bone-Bed, Contained Within The Lower Lisbon Formation, Covington County, Alabama, Angela Ann Clayton

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A fossiliferous lag layer is exposed, at low water levels, next to Point "A" Dam north of River Falls, Alabama. The location of the research site was a coastal region, during the Middle Eocene, and most likely an estuary with complex depositional systems due to the interaction of fluvial and tidal processes. Most of the vertebrate remains at this locality are well preserved and indicate a low-energy environment. The exposure consists of unconsolidated sands rich with Chondrichthyan and Reptilian remains. Little work has been conducted at this location and the exposure was thought to be conformable. With a thorough lithological …

Marine Vertebrate Remains From Middle-Late Devonian Bone Beds At Little Hardwick Creek In Vaughns Mill, Kentucky And At The East Liberty Quarry In Logan County, Ohio, John M. James

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Stratigraphic, lithologic, faunal and condont biozone analysis will provide insight to whether or not East Liberty Bone Bed, in Logan County, Ohio, and Little Hardwick Creek Bone Bed C, in Vaughns Mill, Kentucky, are chronostratigraphic correlations to one another; they are separated by 370 kilometers (230 miles). Material from each bed was collected and broken down in acid and analyzed. Remaining residue after acid treatment was analyzed under a dissecting microscope for lithological and fossil contents, identified from previous fossil vertebrate findings at other locations.

Final analysis of these beds showed that lithologically and faunally they are very similar. However, …

Methylmercury In Mosquitoes: Impact Of A Large Coal-Fired Power Station In Central Ohio, Matthew J. Konkler

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Emissions from coal-fired utilities are the major anthropogenic source of mercury (Hg) to the atmosphere. Because emitted Hg may be deposited near the source, there are concerns on levels of toxic monomethylmercury (MeHg) in local biota. We investigated the potential impact of a large Hg-emitting (> 500 kg Hg y-1) coal-fired power station on MeHg levels in mosquitoes near the Conesville power station in central Ohio. Mosquitoes were sampled with CO2-baited traps at 23 locations within a 60 km radius of the utility and at three reference sites distant from Hg combustion sources. MeHg in mosquitoes within a 30-km radius …