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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The Ostracod Fauna of the Eramosa Member of the Lockport Formation (Middle Silurian)

Teeter, James Wallis 05 1900 (has links)
Ostracods from the Eramosa member of the Lockport formation have been described from four quarries. These include three species of Paraechmina, one of Beyrichia (Velibeyrichia), Bolbiprimitia, Drepanellina, Kloedenella and Eukloedenella, and two species of Dizygopleura and Bythocypris. Two new genera, Dundasia end Parajonesites and four new species, Dundasia bicarinata, Parajonesites carinata, Bolbiprimitia punctosulcata, and Dizygopleura copensis have been proposed. One genus and species has not been identified. The vertical ranges of several species have been extended. The fauna appears to indicate shallowing conditions eastward from Dundas. Most species have been measured with respect to at least length and height, and from this the mean dimensions for each instar have been calculated. In most species the growth factors appear to vary systematically throughout ontogeny. / Thesis / Master of Science (MS)
2

High-resolution event stratigraphy (hires) of the Wenlock—Pridoli interval in the eastern United States

Oborny, Stephan C 01 August 2019 (has links)
Silurian strata of eastern North America have been thoroughly studied for nearly two centuries. Through these investigations a general understanding of unit distribution and correlative relationships were established throughout the region. Many of these interpretations remain valid still to this day, however, with advancements in stratigraphic methodologies in the last few decades (e.g., sequence-, chemo-, and biostratigraphy), numerous discrepancies have come to light with regards to the chronostratigraphic correlation of several stratigraphic intervals throughout the region. A number of these discrepancies within the lower Silurian (Llandovery—lower Wenlock) have been resolved in the last two decades permitting the establishment of refined depositional models and sequence stratigraphic hierarchies for strata deposited during this interval of time for the Appalachian, Illinois, and Michigan basins. Though these studies provided significant improvement to the chronostratigraphy of eastern North America, there remained a large under-evaluated stratigraphic interval spanning the remainder of the Silurian (Wenlock—Pridoli), which is host to expansive evaporite reserves and hydrocarbon resources throughout eastern North America. As such, it is critical that these strata are accurately and precisely correlated throughout the region and that temporal constraint be applied to these resources in order to evaluate their potential and develop predictive models for their future utilization. The investigation herein provides high-resolution chronostratigraphic analyses of several core and outcrop from the eastern, southwestern, and western margins of the Appalachian Basin. These analyses included the integration of δ13Ccarb chemostratigraphy, conodont biostratigraphy, sequence stratigraphy, and subsurface geophysical data. The work herein now permits the establishment of global series and stage boundaries for the upper Silurian throughout the Appalachian and Michigan basins and also addresses regional miscorrelations within strata on both the eastern and western margins of the Appalachian Basin to provide a united sequence stratigraphic hierarchy between the Appalachian, Illinois, and Michigan basins.
3

A Geographical Study of Mono Township

Edwards, Karen Louise 04 1900 (has links)
No Abstract Provided / Thesis / Bachelor of Arts (BA)

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