Thesis (Ph. D.)--University of Wisconsin--Madison, 1973. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1955. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 66-69).

With a radiometric age of 396 ± 12 ma, the Rhynie Cherts, Grampian Region, Scotland, are the oldest unequivocal surface expression of an epithermal system in the world. Data is presented from 8 cored boreholes drilled within 100m of the Rhynie Cherts subcrop. The cherts are present in the upper part of the Lower Devonian basin infill which forms the Rhynie outlier. The basin is a half-graben structure, with a northeast/southwest trending western boundary, following the regional stress trend. In the area of the Rhynie Cherts, the western boundary is complicated by a series of cross faults. The eastern boundary is unconformable. The basin infill, in the area of Rhynie village, is a fining upwards sequence, produced locally from the newly formed Caledonide mountains. The basal Pre-Lava Sandstones Unit is an alluvial fan deposit. This is overlain by a series of basaltic andesite lavas with associated agglomerates and lapillistones. The Tuffaceous Sandstones Unit, containing both airfall and fluvially reworked tuffaceous material was deposited at the close of volcanic activity. The next unit in the series is the Shales with Thin Sandstones Unit, which contains the Rhynie and Windyfield Cherts. These two units of the post-lava sequence represent alluvial plain deposition, with evidence for sub-aerial exposure. The uppermost unit in the outlier is the Quarry Hill Sandstones unit, comprising fluvial channel sandstones. Hot spring activity occurred during the deposition of the Shales with Thin Sandstones Unit, resulting in the deposition of the Rhynie and Windyfield Cherts. A 35m cored borehole permits study of a vertical section through the chert bearing strata.

Thesis (Ph. D.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains viii, 167 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 66-73).

Thesis (Ph. D.)--L'Université Paul Sabatier de Toulouse, 1978. / Includes bibliographies and index.

Thesis supervisor: Ann F. Budd. Includes separate files for thesis supplements. Includes bibliographic references (p. 71-75).

Thesis (M.S.)--Ohio State University, 1974. / Includes bibliographical references (leaves 50-55). Available online via OhioLINK's ETD Center

Both fossil and living foraminifera have been investigated in this study. Late Cretaceous age foraminiferal assemblages have been used to examine the relationship between high-frequency sea level change, biotic response and paleoceanography, in the U.S. Western Interior Sea. Living planktic foraminifera were also studied in order to test a novel hypothesis on the evolution of cellular organelles known as fibrillar bodies. The major findings of this dissertation are: (1) The third-order Greenhorn tectono-eustatic cycle (late Cenomanian-middle Turonian) in the Cretaceous Western Interior Basin is superposed by fourth-order relative sea level cycles and fifth-order parasequences that are reflected in foraminferal assemblages and carbonate content of shales and mudrocks. The study interval includes the Cenomanian/Turonian (C/T) boundary event (93.3 Ma) and the highest stand of sea level in the western interior during early Turonian time. Calcareous benthic foraminiferal assemblages show marked shifts in taxon dominance which is interpreted as ecologic replacement indicating change from a food-controlled to an oxygen-controlled environment. Acmes of the genus Gavelinella are related to the initiation of fourth-order transgressive episodes early in the third-order transgression and late highstand phases of the Greenhorn Cycle. The rapid proliferation of this taxon is thought to be a response to pulses of food. Warm, oxygen-poor Tethyan waters spread across the WIS during the late transgression and highstand phases of the Greenhorn Cycle. A rapid ecologic shift to Neobulimina dominance is the benthic foraminiferal response to this Tethyan incursion. The relative abundance of Neobulimina shows a highly significant correlation to carbonate content (p $<$ 0.01), which is a proxy for warm, more normal marine water masses entering the WIS from the south. Tethyan water masses were replaced by those of Boreal affinity and agglutinated benthic foraminiferal assemblages during the regressive phase of the Greenhorn Cycle. Variations in benthic foraminiferal assemblage composition mirror changes in water mass salinity, oxygenation, circulation and productivity. Foraminiferal data from the western margin of the WIS support GCM models of estuarine circulation. (2) Fibrillar bodies are organelles present in the cytoplasm of all planktic foraminifera. I propose that they may have originated as symbiotic bacteria. Those in Pulleniatina obliquiloculata are squat to elongate ovoids and elongate rods with a length of 2-15 $\mu$m and a diameter of 2-5 $\mu$m. One, sometimes two such bodies (possibly products of binary fission) are bounded by a membrane-like vacuolar structure. They have an electron-lucent (DNA-containing?) central region, ribosome-like and storage-like granules, and are commonly enclosed within a vacuole. (Abstract shortened by UMI.)

Thesis (Ph. D.)--University of Wisconsin, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Bowling Green State University, 2007. / Document formatted into pages; contains xi, 111 p. : ill. (some col.), col. maps. Includes bibliographical references.