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 130 for “"Fossil record"”.
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Exceptional Preservation and Bias in the Fossil Record
… and on potential source of bias in the fossil record. The occurrence of exceptionally preserved fossil assemblages and the existence of systematic bias in the fossil record from a variety of sources represent opposing forces acting on the information quality of the fossil record. …
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Investigating Predation in the Fossil Record: Modern Analogs
… to examine predator-prey interactions in the fossil record. Considering the importance of community interactions in the current global biodiversity crisis, understanding ecological and evolutionary dimensions of predation is critical to conservation biology and ecology, as predators are …
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Statistical analyses of extinction in the marine fossil record
… regarding the nature of extinction in the fossil record of marine invertebrates were investigated using statistical methods and familial diversity data. First, a series of analyses were performed to determine whether the magnitudes of mass extinctions were statistically distinguishable from …
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Fossoriality In Snakes: Perspectives From Morphology And The Fossil Record
… perspectives using both extant snakes and the fossil record. 1. Alternate phylogenetic positions of fossils affects body size estimates in snakes Body size is a readily available metric for both extant and extinct snakes. The competing hypothesis of ecological snake origins also predict …
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How do taxonomic biases in the fossil record and phylogenies interact?
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Exploring the silicification of microbes and understanding their role in the fossil record
… mats in Proterozoic peritidal environments were fossilized by silicification, but the environmental and biological factors that shaped these structures and enabled this type of preservation are not well understood. Recent work has shown that coccoidal cyanobacteria can become fossilized because …
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Is the presence of biomolecules evidence for molecular preservation in the fossil record?
… of analysis previously inaccessible from the fossil record. As new technology (e.g., high resolution mass spectrometry) has been incorporated into fossil analyses, researchers have begun to detect biomolecules in terrestrial vertebrates dating back to the Triassic Period (~230 Ma). However, …
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Molecular characterization and effect of diagenesis and maturation of melanin in the fossil record
… chemical preservation and distribution in the fossil record. Melanins are polymeric phenolic compounds classified into two major groups based in their chemical structures and molecular precursors: eumelanin (dark brown-black in color) and pheomelanin (orange-red in color). Both eumelanin and …
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Quantitative Analysis of Drilling Predation Patterns in the Fossil Record: Ecological and Evolutionary Implications
… ecological and evolutionary interactions in the fossil record. To date, most of this research has been done on Late Mesozoic and Cenozoic deposits, and large-scale studies have focused on temporal rather than spatial patterns. However, drilling predation occurs throughout the entire Phanerozoic, …
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Identifying Myotis Species Using Geometric Morphometrics and its Implications for the Fossil Record and Conservation
… some dimorphism may be present. A sample of fossil <em>Myotis </em>of unknown species from Bat Cave, Kentucky, was analyzed in an attempt to identify the specimens to species. Results indicate that <em>Myotis austroriparius </em>and <em>M. sodalis </em>predominate the sample, possibly with …
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Of mice and hominins: using the craniomandibular morphology of hybrid mice to better understand hybrid morphologies in the Hominin fossil record
Since the sequencing of the Neanderthal genome in 2010, there has been an explosion of molecular research into hybridization and gene flow among hominin taxa in the Late Pleistocene. However, little research has focussed on how hybridization affects skeletal morphology. In regions and time periods …
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The Biomechanics of Spear Throwing: An Analysis of the Effects of Anatomical Variation on Throwing Performance, with Implications for the Fossil Record
… of the patterns observed for Paleolithic fossil hominins.</p><p>Throwing performance, measured as the energy imparted to a thrown object: kinetic energy, Ke), was assessed in 41 experienced throwers throwing balls and spear-like objects. Joint linear and angular velocities, torques, and …
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Tephrostratigraphy, petrography, geochemistry, age and fossil record of the Ganigobis Shale Member and associated glaciomarine deposits of the Dwyka Group, Late Carboniferous, southern Africa
… second deglaciation sequence comprises a thick fossiliferous mudstone unit, referred to as the ”Ganigobis Shale Member”. An abundance of marine macro- and ichnofossils as well as extrabasinally derived ashfall tuff beds characterise the more than 40 m thick mudstones and provide the basis for an …
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The Evolving Face of God as Creator: Early Ninteenth-Century Traditionalist and Accommodationist Theological Responses in British Religious Thought to Paleonatural Evil in the Fossil Record
… as posited by a deep-time interpretation of the fossiliferous portions of the geologic column. If those entities which are commonly labeled as natural evil are deciphered to have existed long before the arrival of humanity (and thus sharing no causal nexus with original sin), then believers would …
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The evolution of extreme longevity in modern and fossil bivalves
… one. Most studies of evolution in the fossil record examine changes in the size and the shape of organisms through time. Size and shape are in part a function of life history parameters like lifespan and growth rate, but so far little work has been done on either in the fossil record. …
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Contributions to Exceptional Fossil Preservation
Exceptionally preserved fossils—or fossils preserved with remains of originally non-biomineralized (i.e. soft) tissues—constitute a key resource for investigating the history of the biosphere. In comparison to fossils of biomineralized skeletal elements, which represent the majority of the fossil …
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Quantitative Estimates of Time-Averaging in Brachiopod Shell Accumulations from a Holocene Tropical Shelf (SW Brazil)
Time-averaging, the mixing of fossils of different ages within a single bed, defines the limit of temporal resolution of the fossil record. Quantitative estimates of this resolution threshold have not been acquired for any group other than mollusks. This study provides the first quantitative …
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The evolutionary transition from reptiles to mammals: analyses of body size reduction and separation of middle ear elements from the jaw
… of these bones is documented in the fossil record, though gaps remain. In order to help elucidate some of the existing gaps, we studied the transition of these elements in the development of an extant mammal. Modern marsupials are born in an extremely premature state. In fact, at the …
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Evolution and diversity of passerine birds of Australasia
… data, but also a broad sampling of modern and fossil taxa. The Australian fossil record is crucial to understanding the evolutionary history of passerines because much of their early evolution is presumed to have occurred in this region. However, the passerine fossil record is very scarce and …
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