Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"conodont"”.
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Des Moinesian Conodont Assemblages From the Illinois Basin
Made available in DSpace on 2014-12-11T18:10:10Z (GMT). No. of bitstreams: 1 7500258.pdf: 5450458 bytes, checksum: 39f1b0d176f4a7538a0f639e544b8e8f (MD5) Previous issue date: 1974
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Conodont Apparatuses From Chesterian (Mississippian) Strata of Montana and Illinois
Made available in DSpace on 2014-12-14T07:10:49Z (GMT). No. of bitstreams: 1 7624152.pdf: 12223966 bytes, checksum: ccc43ad94fffe72658ea9f8776263244 (MD5) Previous issue date: 1976
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Late Devonian and Early Mississippian Conodont Faunas of the Upper Mississippi Valley
Made available in DSpace on 2014-12-04T19:13:45Z (GMT). No. of bitstreams: 1 5805493.pdf: 11303925 bytes, checksum: df38902d344f636ace46a6d08f07e954 (MD5) Previous issue date: 1958
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Conodont biostratigraphy and paleoecology of the Lower Devonian Helderberg Group of Virginia
… Devonian age, leaving a gap of at least six conodont zones represented by the Ridgeley Sandstone and its bounding unconformities. Conodonts tend to avoid tidal flat and lagoonal environments. They are not uniformly distributed through the rest of the section, but the occurrence of all but two …
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Stratigraphy and conodont paleontology of late Silurian-early Devonian strata of western Virginia
… at least three potentially useful multielement conodont apparatuses. Two multielement species of the genus Ozarkodina may prove to be useful in determining the boundary between the Silurian and Devonian Systems in the Appalachian Basin. Currently, a single form species, Icriodus woschmidti …
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Middle Ordovician (Chazyan) conodont biostratigraphy and structural geology of the McMullin Syncline, Smyth County, Virginia
… during a major transgression. Altogether, 3519 conodonts representing 48 monoelement or multielement apparatuses and 19 form species were recovered. Biostratigraphically important conodonts recovered from this ramp to basin sequence include: Polyplacognathus friendsvillensis, Polyplacognathus …
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Conodont biostratigraphy of the Bakken and lower Lodgepole Formations (Devonian and Mississippian), Williston Basin, North Dakota
<p>Fourteen cores were sampled and processed, and conodonts obtained were used in the biozonation of the Bakken and basal Lodgepole Formations in the Williston Basin in North Dakota. The Bakken Formation of Devonian and Mississippian age and the Lodgepole Formation, entirely of Mississippian age, …
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Conodont Biostratigraphy of the Middle and Upper Ordovician Viola Group of the South-Central Oklahoma Arbuckle Anticline
The conodont biostratigraphy of the Viola Group of the south-central Oklahoma Arbuckle Anticline is described. Over 8000 identifiable conodont elements were recovered from 115 samples collected from the Viola Group at a single locality . The stratigraphic ranges of the conodonts are used to …
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Interpreting Early Triassic (Smithian) sea-level change and climate using sequence stratigraphy and oxygen isotopes of conodont apatite
… were collected for oxygen isotopic analyses of conodont apatite from the two field locations (in Utah) in a sequence stratigraphic framework to better understand the Smithian paleoclimate. Due to an up to ~1.5 ° disparity of values between the two locations, additional conodont elements were …
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Selected Famennian (Late Devonian) events (Condroz, Annulata, Hangenberg) in Sardinia and in the Carnic Alps: conodont biostratigraphy, magnetic susceptibility and geochemistry.
… events. A biostratigraphic study based on conodonts was carried out to individuate the precise biostratigraphic position when the events occurred. The evolution of the low field magnetic susceptibility and the major elements geochemistry (Al, Si, K and Ti) have been investigated to study …
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Investigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopes
… Formation of southwest Montana. We combined conodont-oxygen isotopes (δ18Oapatite¬) and carbonate-carbon isotopes (δ13Ccarb) with cyclostratigraphy of Woodhurst cycles to test the hypothesis that the cycles developed in response to glacial eustasy, evaluate the timing and initiation of the …
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Subdivisions and correlations of the Tully Formation (Upper Devonian) in New York State and Pennsylvania on the basis of a statistical and stratigraphical analysis of selected conodonts.
… are based on the ratios of the abundance of the conodonts Polygnathus linguiformis, P. varca, P. iuvenis and Icriodus. The statistical distribution of the four taxa is independent of the local lithology, but follows stratigraphical units. The studied conodont faunal succession of the Tully …
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Conodonts of the Bakken Formation (Devonian and Mississippian), Williston Basin, North Dakota
… for hydrocarbons in the Williston Basin.</p> <p>Conodonts were selectively sampled from cores of the Bakken in North Dakota in an effort to determine the age and thermal maturity of the formation. A diverse conodont collection of more than 700, mostly fragmentary, elements was obtained by …
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Meramecian conodonts and biostratigraphy of the (upper Mississippian) Greenbrier Limestone (Hurricane Ridge and Greendale Synclines), southwestern Virginia and southern West Virginia
… the biostratigrapaic distribution of Meramecian conodonts from three measured sections of the Greenbrier Limestone (Meramecian-Lower Chesterian), located in the Greendale and Hurricane Ridge Synclines of southwestern Virginia and southern West Virginia. The Little Valley Formation, Hillsdale …
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The Durness Group of NW Scotland: a stratigraphical and sedimentological study of a Cambro-Ordovician passive margin succession
… microbial facies within the section. A revised conodont biostratigraphy for the Ordovician upper five formations of the Durness Group allows more precise correlation with the once contiguous sections in western Newfoundland and Greenland and dating of the lithostratigraphical and sequence …
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Silurian Conodonts from the Wills Mountain Anticline, Virginia, West Virginia, and Maryland
… to the New York section. The succession of conodont faunas described for these formations range from latest Wenlock through Pridoli in age. The fauna includes 46 form species assignable to the form genera Hindeodella, Ligonodina, Lonchodina, Neoprioniodus, Ozarkodina, Panderodus, …
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Paleogeothermal Conditions in the Illinois Basin During Late Paleozoic Coalification
… the time of coalification, through the study of conodont alteration, CL petrography, study of fluid inclusions, and measurement of stable-isotopes; and model the basin using the Basin2 finite-difference program. The results demonstrate that paleotemperatures decrease from south to north, and that …
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