Global ETD Search
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Showing 1 to 6 of 6 for “"K-Pg boundary"”.
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Benthic foraminiferal change and depositional history across the Cretaceous – Paleogene (K/Pg) boundary in the Brazos River area, Texas
The Cretaceous–Paleogene (K/Pg) boundary marks one of the major crises in the history of life on Earth. The cause is widely regarded as a large bolide impact at Chicxulub, Mexico, coincident with a major series of volcanic eruptions on the Deccan Plateau, India. Fieldwork in the Brazos River area …
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Changes in morphological disparity in eutherian mammals across the K-Pg boundary and Palaeocene-Eocene Thermal Maximum using discrete morphofunctional characters
… on Eutheria was the Cretaceous–Paleogene (K–Pg) extinction event, ~66 million years ago. Prior to this extinction event, during the Mesozoic, known eutherians were small and apparently predominantly insectivorous, showing relatively limited morphological disparity. After it, during …
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Dinoflagellate Cyst Biostratigraphy, Palynofacies and Paleoenvironmental Analysis of the Maastrichtian and Basal Danian, Brazon River, Texas
… 2, and then show a small decrease above the K-Pg boundary within Interval 3, indicating that the K-Pg event was not catastrophic for the dinoflagellates. The Cerodinium spp. and Spiniferites spp. complex comprise a large proportion of the species within the section. High abundance peaks of …
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Trace Element Geochemistry of Compositionally Layered Impact Spherules
… globally as unique marker beds, such as at the K-Pg boundary. A minimum of 11 spherule beds have been identified in the Archean and Paleoproterozoic, and provide a record of impact events that predate any known craters. This study of 3.24 Ga impact spherules from the S3 spherule layer in the …
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Patterns and processes in animal evolution : molecular phylogenetics of Southern Hemisphere fauna : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Genetics
… in the Oligocene, the asteroid impact at the K – Pg boundary, and the continental breakup of Gondwana. It investigates what impact these events had on species diversification by studying the phylogenetic relationships of two groups of taxa – the family Anostostomatidae (insects), and Neoaves …
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Molecular evolution following allopolyploidization in Gossypium
… polyploidy events can be placed near the K-Pg boundary, coinciding with the extinction of nearly 70% of all plant and animal life, including all non-avian dinosaurs, suggesting that polyploidy has important adaptive potential and may play a vital role in determining success following the …