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 48 for “"Paleobiology"”.
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Geochemical Approaches to Paleobiology, Paleoclimatology, and Chronostratigraphy of the Cretaceous Cloverly Formation
This dissertation explores the use of geochemical tools to evaluate the timing and nature of biotic and environmental change in the Cloverly Formation. Carbon isotope stratigraphy presented here suggests that the fossiliferous interval of the Cloverly is constrained to mid-late Albian in age, …
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Paleobiology of the Early Cambrian Yanjiahe Formation in Hubei Province of South China
Fossils recovered from limestones of the lower Cambrian (Stage 2-3) Yanjiahe Formation in Hubei Province, South China, recovered using acetic acid maceration, fracturing, and thin sectioning techniques were examined using a combination of analytical techniques, including energy dispersive …
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Paleobiology, Biostratigraphy, and Taphonomy of Neoproterozoic Eukaryotes and Cambrian Animals with Carbonaceous Preservation
… research techniques to investigate the paleobiology, biostratigraphy, and taphonomy of carbonaceous fossils in critical times of early life evolution, including Neoproterozoic and Cambrian. Chapters 2 to 5 in this dissertation present original research that helps to decipher hidden …
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New evidence for complex mosasaur paleobiology: oxygen isotopes in enamel reveal habitat variation of clidastes from the Mooreville Chalk, Alabama
… specimens in the world. Here I investigate the paleobiology of these extinct swimming lizards through schlerochronological analysis of fossil teeth with unparalleled temporal resolution. By analyzing the oxygen isotope composition of enamel phosphate in eight consecutive, fully erupted teeth, I …
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Contributions and New Methods in Paleontology: Geochemical, Ultrastructural, and Microstructural Characterization of Archean, Proterozoic, and Phanerozoic Fossils
… decade, the study of organismal or systematic paleobiology has been progressing into a new age of digital paleobiology, in which advanced instrumentation is utilized for primary data collection and analyses. Having been progressing throughout this field of study, advanced instruments–commonly …
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Quantitative approaches and applications to the sequence stratigraphy and biodiversity of Pleistocene – Holocene mollusk communities from the Po plain, Italy and San Salvador Island, the Bahamas
… The integration of sequence stratigraphy with paleobiology can enhance our understanding of spatiotemporal biotic patterns recorded in the fossil record. Used in conjunction with the highly-resolved stratigraphic framework, biotic patterns can be used to assess depositional cycles and …
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Cursorial Adaptations in the Forelimb of the Giant Short-Faced Bear, <em>Arctodus simus</em>, Revealed by Traditional and 3D Landmark Morphometrics
<p>The paleobiology of the Pleistocene North American giant short-faced bear, <i>Arctodus simus</i>, has eluded paleontologists for decades. Its more gracile form has led past researchers to myriad intepretations of the locomotion and feeding ecology of this species. While earlier studies have …
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The Effects Of Vertebral Morphology And Composition On Stem-Tetrapod Intervertebral Joint Functional Behavior
… dissertation integrates cutting edge methods in paleobiology and biomechanics to answer these critical questions in tetrapod evolution by: (1) investigating links between vertebral diversity and habitat use in early amphibians that straddle the land-water divide (Temnospondyli); (2) developing …
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NEARING THE END: REEF BUILDING CORALS AND BIVALVES IN THE LATE TRIASSIC AND COMPARING CORALS AND BIVALVES BEFORE AND AFTER THE END-TRIASSIC MASS EXTINCTION USING A TAXONOMIC DATABASE
… In addition, by building upon data from the Paleobiology Database, changes in the global reef communities after the end-Triassic mass extinction can be examined.
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NEARING THE END: REEF BUILDING CORALS AND BIVALVES IN THE LATE TRIASSIC AND COMPARING CORALS AND BIVALVES BEFORE AND AFTER THE END-TRIASSIC MASS EXTINCTION USING A TAXONOMIC DATABASE
… In addition, by building upon data from the Paleobiology Database, changes in the global reef communities after the end-Triassic mass extinction can be examined.
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Eurasian Middle and Late Miocene Hominoid Paleobiogeography and the Geographic Origins of the Homininae
… to environmental factors. Using the NOW and Paleobiology databases, together with data collected through survey and excavation of middle and late Miocene vertebrate localities in Hungary and Romania, taphonomic bias and sampling completeness of Eurasian faunas are assessed. Previous …
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Mammalian Postcranial Evolution and Primate Extinction in the Middle Eocene of North America
… primitive eutherian mammals to reconstruct the paleobiology of these groups,: 2) identify measurements of the astragalus and distal humerus that consistently discriminate open-country from closed-country taxa in a diverse sample of modern mammals, and: 3) apply the astragalar measurements to a …
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Contributions to the Neoproterozoic Geobiology
… improve our understanding of the Neoproterozoic Paleobiology. In chapter 1, a comprehensive quantitative analysis of the Ediacara fossils indicates that the oldest Ediacara assemblage "the Avalon assemblage" already encompassed the full range of Ediacara morphospace. A comparable morphospace …
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Contributions to late Ediacaran geobiology in South China and southern Namibia
… occurred. In addition, the study of Ediacaran paleobiology involves numerous factors, including but not limited to, restricted amount of outcrops, taphonomic biases, metamorphism, enigmatic phylogenetic affinities, non-actualistic atmospheric and oceanic conditions, and unusual taphonomic …
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The Multituberculates as Living Animals: New Insights into the Ecomorphology, Behavior, and Life History of One of the Most Successful Mammalian Lineages
… in early mammalian fossil assemblages, the paleobiology of multituberculates remains relatively obscure, due in part to their lack of modern descendants, and in part to their highly specialized, non-analogous dental and skeletal morphology. In this dissertation, I use a combination of linear …
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Environmental controls on the skeletal mineralogy of marine calcifiers
… success of aragonitic calcifiers from the Paleobiology Database (PBDB), as well as with the relative production of aragonite in reefs from the Paleoreefs Database (PARED). From the Late Jurassic onwards, temporal trends in marine skeletal mineralogy appeared unaffected by changes in ASI, …
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The lifestyle of Antarcticavis capelambensis through a study of Polar section modulus
<p>When it comes to shallow marine fossil deposits of Late Cretaceous age, the avian fossils present are few and specific. The fragmentary avian fossils that are excavated almost exclusively show a foot-propelled diving lifestyle. Other lifestyles, such as flying, running, soaring, or flapping …
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