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Showing 1 to 20 of 27 for “"conodonts"”.
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Cambrian and Ordovician Conodonts From the Big Horn Mountains, Wyoming
Made available in DSpace on 2014-12-04T19:14:20Z (GMT). No. of bitstreams: 1 6303226.pdf: 3178146 bytes, checksum: 552f549560195bf2dc446a24634893c0 (MD5) Previous issue date: 1962
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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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Silurian Conodonts from the Wills Mountain Anticline, Virginia, West Virginia, and Maryland
Condodont biostratigraphy has been established for complete sections of the Mifflintown, Wills Creek, and Tonoloway formations along the Wills Mountain anticline in the Central Appalachians. Beds in the Central Appalachians formerly called the Rochester Formation have been renamed the Cosner Gap …
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Ultrastructure and Biostratigraphy of the Conodonts of the Monte Cristo Group, Arrow Canyon Range, Clark County, Nevada
Made available in DSpace on 2014-12-09T20:34:40Z (GMT). No. of bitstreams: 1 7013446.pdf: 4654739 bytes, checksum: f6a6c4b98960d010b52735cba231f9b3 (MD5) Previous issue date: 1969
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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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Conodont Biostratigraphy of the Middle and Upper Ordovician Viola Group of the South-Central Oklahoma Arbuckle Anticline
… locality . The stratigraphic ranges of the conodonts are used to graphically correlate the Viola Group of the Arbuckle Anticline with the Ordovician Composite Standard Section of North America. The correlation shows the probable age of the lower 2.5 m of the studied section to be middle …
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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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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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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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Interpreting Early Triassic (Smithian) sea-level change and climate using sequence stratigraphy and oxygen isotopes of conodont apatite
… to identify potential physical alteration of the conodonts for the Confusion Range (smooth surface with no signs of alteration), Weber Canyon (pitted surface with signs of potential alteration), and Guling (visibly the most pitted surface with signs of potential dissolution). The δ18O values for …
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Establising a high-frequency standard reference sequence stratigraphy, sea-level curve, and biostratigraphy for Morrowan strata of the Lower Absaroka I time slice based upon the Bird Spring Formation, Arrow Canyon, Nevada
… in Arrow Canyon. Additionally, cycle diagnostic conodonts and foraminifera permit correlation of selected third-order sequences to basins containing time-equivalent strata.
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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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Conodont biostratigraphy and paleoecology of the Lower Devonian Helderberg Group of Virginia
… 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 species is not related to water depth, energy, or substrate; Ozarkodina excavata and …
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Osmoregulatory role of the intestine in fish physiology. Evolutionary, environmental, and toxicant implications
… lines became extinct in life history (e.g., conodonts, ostracoderms, acanthodians, placoderms, etc.). It is so that extant lineages may be speculated to have been successful due to several hypotheses: i) an internal milieu composition that provided a buffering medium, protecting them from …
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Stratigraphy of the Winnipeg and Deadwood Formations in North Dakota
… to Early Crdovician in the Williston Basin. Conodonts from the upper part of the Deadwood formation in northwestern North Dakota are brownish-black, mostly simple cone types and suggest an Early Drdovician age for this part of the Deadwood formation in that area.</p> <p>The Winnipeg formation …
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Paleozoology of cores from the Tyler Formation (Pennsylvanian) in North Dakota, U.S.A.
… species of invertebrates, eleven form-species of conodonts, at least three types of fish, and at least four genera of plants· are present. Invertebrate species include 1 bryozoan, 15 brachiopods, 14 bivalves, 2 gastropods, 2 cephalopods, 2 annelids, 2 branchiopoda, at least 2 ostracodes, 2 …
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The Applications of palynostratigraphy to the Devonian of Bolivia
… America, due to the near/effective absence of conodonts and goniatites, the Devonian Euramerican sea-level curve is relatively untested. However, a possible candidate for the Chotec Event is the basal Los Monos Formation transgression. This is the only major transgressive event during the early …
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Stratigraphy and conodont paleontology of late Silurian-early Devonian strata of western Virginia
… two multielement species, abundant yields of conodonts are necessary to determine the first appearance of Oz. s. remscheidensis. Elements belonging to a third conodont apparatus, Delotaxis elegans, have been recovered from the Keyser and New Creek intervals at the same locations. Delotaxis …
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Chemostratigraphy of the Uppermost Cambrian Below the Ordovician GSSP
… and north China. Without an adequate record of conodonts, high-resolution chemostratigraphic trends of carbon isotope compositions facilitate the correlation of intercontinental and intracontinental sequences.
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