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Showing 1 to 8 of 8 for “"K/Pg"”.
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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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The lifestyle of Antarcticavis capelambensis through a study of Polar section modulus
… they did not survive the Cretaceous-Paleogene (K-Pg) mass extinction event. Adding to this phenomenon are the Late Cretaceous Hesperornithiformes, which are a group of foot-propelled divers that, for the most part, have no wing elements. The hesperornithiforms also failed to survive the K-Pg mass …
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Establishing geochemical constraints on mass accumulation rates across the Cretaceous-Paleogene boundary with extraterrestrial Helium-3
… across the Cretaceous-Paleogene boundary (K-Pg) that are simultaneous with the extinction event and onset of the boundary clay deposition. However, the timescale of these records is difficult to determine near the boundary because of fluctuating sedimentation rates and the short duration 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 …