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Showing 1 to 20 of 52 for “"Paleontological."”.
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Factors Affecting Epithecal Growth Lines in Four Coral Species, with Paleontological Implications
<p>The number of epithecal (external) growth lines was surveyed over 124 days for Montastrea annularis growing at different depths (3.5 m to 61 m). There was a significant (P< .01) decrease in the number of lines with depth. Although the linear regression is significant, there is evidence for a …
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Morphometric Characterization of a <i>Mercenaria</i> spp. (Bivalvia) Hybrid Zone: Paleontological and Evolutionary Implications
Paleontological documentation of hybridization events has the potential to address a multitude of evolutionary and paleobiological issues unanswerable by purely biological means. However, previous studies of modern hybrids suggest that their morphology is often insufficient for their reliable …
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A Paleontological Study of Pedimeant Gravels of Southwestern North Dakota Which Exhibit Evidence of PermaFrost Activity
… during the time of deposition. Because of paleontological, topographic, and geomorphic evidence, it is suggested that the two sites of Tuthill, Laird, and Frye (1964) are not correlative and that one of them, the Marple Ranch site, correlates with the two sites of this study. Although age …
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Geochemical and Paleontological investigations of the Neoproterozoic-Cambrian Transition: Case Studies on geochemical clast provenance, emerging paleo redox proxies, and ambiguous dubiofossils
The transition from the Neoproterozoic to the early Cambrian world was a critical time in the co-evolution of life and the environment, when dramatic changes in the environment, including global glaciations and rising atmospheric oxygen levels precipitated the conditions in which variety of complex …
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Taphonomic and Faunal Parameters From Pleistocene Hominid Site Assemblages in China
… have been assessed only in terms of their paleontological and zoogeographical significance. Analytic techniques assessing taphonomic processes have not been readily applied, particularly in controlled cross-site comparisons. This paper uses faunal analytic techniques and taphonomic …
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Tetrapod phylogeny as inferred from 18S and 28S ribosomal-RNA sequence comparisons
… these groups, however, is controversial. Neither paleontological evidence nor morphological, physiological, biochemical or available macromolecular sequence data from living forms has provided a definitive solution.
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The Lower Carboniferous (Chadian-Brigantian) geology of shallow marine carbonate rocks in the central and southeast Irish Midlands and the Wexford Outlier
… study, consisting of integrated petrographical, paleontological and geochemical analyses on the post-Waulsortian strata in the central and southeast Irish Midlands. This study reveals that the style of sedimentation and early diagenesis substantially influenced the late diagenesis, and the …
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A ocorrência de lagartos marinhos (Mosasauridade: Lepidosauria) e sua associação faunística no cretáceo da bacia Pernambuco - Paraíba, Nordeste do Brasil
… of the Northeastern Brazil. Specimens housed in paleontological collections from several institutions have been examined and new material from the mentioned basin has been collected. The specimens are described and compared and a new taxonomic proposal is presented. Based on two field trips to …
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Quantitative Studies of Late Neogene Coastal Environments Using Bivalve Subfossil and Fossil Assemblages
… as a negative aspect, undermining the utility of paleontological data for retrieving ecological and environmental records. Yet, fossils are still one of the best sources of direct data about the past faunas and their ecosystems. To overcome the biases introduced by the fossilization process, …
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Antifreeze Glycoproteins of Two Unrelated Polar Fishes: Gene Structure, Organization and Evolution
… This molecular evidence in conjunction with paleontological and paleoclimatic data indicate the near-identical AFGPs of Antarctic notothenioids and northern cods evolved independently.
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Fluvial facies architecture and provenance history of the Abrahamskraal-Teekloof formation transition (lower Beaufort group) in the main Karoo Basin
… trends should aid paleo-environmental, paleontological, and basin analysis studies, and improve our understanding of reservoir dynamics (e.g., permeability, connectivity) when used as outcrop analogues for subsurface fluvial reservoirs. High resolution facies mapping showed that …
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Geology of the Late Pleistocene artifact-bearing Wasiriya Beds at the Nyamita locality, Rusinga Island, Kenya.
… stone artifacts in the Wasiriya Beds, for the paleontological work on the fauna of these beds, and for other paleoenvironmental research in these beds. A robust tephrostratigraphic framework was established using diverse statistical methods. Radiocarbon dates confirm a Late Pleistocene age for …
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Smectite/Illite Distribution and Diagenesis in the South Timbalier Area, Northern Gulf of Mexico
… Timbalier protraction were selected near known paleontological markers identifying the Miocene, Pliocene, and Pleistocene boundaries. Bulk mineralogy of each sample, determined by XRD, is primarily mixed-layer smectite and illite with a minor amount of kaolinite. The mixed-layer mineralogies are …
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Lower Cambrian bioherms in central Nevada and eastern California
A comparative sedimentological and paleontological study was made of two approximately coeval Lower Cambrian bioherm complexes, one in the Ravenswood area of Lander County in central Nevada, and the other in the Montenegro Member of the Campito Formation in the White-Inyo Range of eastern …
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High precision U/Pb geochronology on the Cenomanian Dakota Formation, Utah : implications for paleobotany and the transgression of the Western Interior Seaway preceding Oceanic Anoxic Event 2
… Ma. Based on an analysis of stratigraphic, paleontological, and geochronological data, the Dakota Formation was then correlated across much of the Western Interior. These dates provide a base of the initiation of the transgression across Utah, and set a context for the CT boundary and OAE2 …
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Quantitative Ecological and Taphonomic Patterns in Late Cenozoic Mollusk-Dominated Marine Fossil Assemblages
Applications in paleontological research are far from being limited to taxonomic collection and identification. Nor is such research limited to working solely on fossil data. Actualistic paleontology is the study of modern or recent organisms and processes to better understand those of the past. …
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Dinoflagellate paleoecology and biostratigraphy of the Middle Eocene Tallahatta and Lisbon Formations from the Baldwin County, Alabama, Core
… Depositional Sequence Analysis Group to gather paleontological, sedimentological, paleomagnetic, geophysical, and geochemical data from the Alabama Coastal Plain for the purpose of calibrating the Tertiary time scale with the sequence stratigraphy of the Gulf region. A total of 101 taxa were …
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A paleozoological perspective on predator extermination and white-tailed deer (Odocoileus virginianus Boddaert) overabundance in central Texas.
Archaeological and paleontological datasets are used in conservation to add time-depth to ecology. In central Texas several top carnivores including prehistoric Native American hunters have been extirpated or have had their historic ranges restricted, which has resulted in pest-level white-tailed …
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Macrofossil Biostratigraphy of the Cannonball Formation (Paleocene) in North Dakota
… the upper, middle, and lower intervals. </p><p>Paleontological data were studied from those localities for which the stratigraphic position is known. The data from 33 of these localities were analyzed by Q-mode cluster analysis and by sorting. </p><p>The cluster analysis produced no definite …
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Preliminary Study of Lake Agassiz Sediments
… variations in the sediment. The engineering and paleontological techniques were not as good because of the lack of application and development in studying glacial Lake Agassiz sediments. Future work in these areas may remedy this problem and give a clearer picture of the history of glacial Lake …
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