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 175 for “"Triassic"”.
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Triassic Stratigraphy of Western Central Canada
Made available in DSpace on 2014-12-04T19:13:55Z (GMT). No. of bitstreams: 1 6003892.pdf: 5933640 bytes, checksum: ab58510b0929ff53c4e810ce1917f48c (MD5) Previous issue date: 1960
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Remanent magnetization of Eastern United States triassic rocks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1960.
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Discovering the last Triassic giant: Insights from the marine Late Triassic of Nevada and a new ichthyosaur locality from New York Canyon, Nevada, USA.
… marine reptiles that first appeared in the Early Triassic Period and continued to be an integral part of marine ecosystems into the Middle Cretaceous Period. At the end of the Triassic, ichthyosaurs were devastated by the end-Triassic Extinction, and never again reached the giant scale or …
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Extinction and recovery dynamics of Triassic-Jurassic macro-invertebrate communities
… decreased 35% and 16% at the end of Permian and Triassic, respectively. During the extinction events, non-motile animals, organisms with little physiological control of biocalcification and the epifaunal forms, were heavily affected. This indicates that the mass extinction had a particular …
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Permo-triassic paleogeography and tectonics of the southwestern United States
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1985.
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Evolution in biological radiations; insights from the Triassic archosaur radiation
… diversification through the Early to Late Triassic is well documented in the literature. Prior to the end-Permian mass extinction, these reptiles were both species poor and ecologically limited, but by the Late Triassic they dominated terrestrial ecosystems in both species abundance and …
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Ancient Triassic Halite as a novel source of antibiotic chemical diversity
This thesis aimed to establish the potential of extremely halophilic microorganisms, isolated from Kilroot Salt Mine, as a reservoir of unexplored natural product chemistry with antimicrobial activity against the clinically relevant ESKAPE pathogens. The capacity of haloarchaea to modulate …
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Multi-proxy palaeoclimate reconstruction of the permian-triassic mass extinction event
The Permian/Triassic (P/Tr) boundary is widely assumed to have been a time of extreme environmental upheaval and change. In the terrestrial realm, a negative anomaly in 813C isotope values has been reported from organic carbon in Antarctica, Australia, India and Madagascar, and from marine …
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The Post Triassic uplift and erosion history of the Southwestern UK
… region have been subject to widespread post-Triassic exhumation, the timing, magnitude and causes of which are debated. Exhumation of up to 6km (but more generally ≤3km) has been shown to have affected the Western UK Continental Shelf. This region contains a series of intra-plate extensional …
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Triassic to Neogene Evolution of the Andean Retroarc: Neuquén Basin, Argentina
… in variable tectonic settings from the Late Triassic to the early Cenozoic including: 1.) active extension and deposition in isolated rift basins in the Late Triassic-Early Jurassic; 2.) post-rift back-arc basin from Late Jurassic-Late Cretaceous; 3.) foreland basin from Late Cretaceous to …
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Taphonomy of Sediments: Bioturbation in the Triassic Moenkopi Formation in Southwestern Utah
… to determine the intensity of bioturbation in Triassic Moenkopi Formation at Hurricane Mesa in Southwestern Utah. This formation is interpreted as having been deposited mostly in large ancient river channels, tidal flats, delta and shallow marine environments. Five stratigraphic sections …
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Direction and intensity of Earth's magnetic field at the Permo-Triassic boundary
… Basalts (Russia) which are coeval with the Permo-Triassic boundary (250 Ma). The sequence yields the by far oldest hitherto studied detailed record of a geomagnetic transition from reversed to normal polarity and provides new insights in transitional field behaviour. Three sections (Talnakh, …
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GRAVITY SURVEY OF A BURIED TRIASSIC RIFT BASIN, BERTIE COUNTY, NORTH CAROLINA
… American rift margin includes of a series of Triassic rift basins along the eastern seaboard of the United States and Canada. This continent-scale rift basin system is comprised of complex and variable geometries that can be generalized into regions with similar structural, deformational, and …
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Paleomagnetism of Late Triassic and Jurassic sediments of the southwestern United States.
… During the Carnian and Norian stages of the Late Triassic, Chinle poles progress westward. During the Hettangian through Pliensbachian stages of the Early Jurassic, the pattern of APW changed to an eastward progression. Even after correction for 4° clockwise rotation of the Colorado Plateau, a …
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Biogeochemical proxies for environmental and biotic conditions at the Permian-Triassic boundary
The extinction at the Permian-Triassic boundary marked one of the most profound events of the Phanerozoic Eon. Although numerous hypotheses have been proposed, the trigger mechanism continues to be debated. This thesis intends to examine the impact of oceanic conditions on the extinction event by …
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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
… as part of the system that caused the end-Triassic mass extinction. Ocean acidification can be greatly detrimental to the skeletal structures of marine invertebrate such as reef building corals and bivalves. During the Norian and Rhaetian (Late Triassic), corals and bivalves had high …
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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
… as part of the system that caused the end-Triassic mass extinction. Ocean acidification can be greatly detrimental to the skeletal structures of marine invertebrate such as reef building corals and bivalves. During the Norian and Rhaetian (Late Triassic), corals and bivalves had high …
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Triassic-Jurassic biochronology of the eastern Iskut River map area, northwestern British Columbia
Norian to Early Callovian faunas in the eastern half of the Iskut River map area can be divided into three suites: a benthonic fauna consisting of bivalves, corals, and gastropods; a planktonic fauna of radiolarians; and a nektonic fauna of coleoids and ammonoids. The ammonoids (27 genera, 47 …
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Morphology, Mineralogy, and Hydrology of Soils in the Triassic Culpeper Basin of Maryland
… purposes. Such soils occur within the Triassic Culpeper Basin of Maryland. Eleven pedons along two topohydrosequences within this basin were therefore investigated to determine the interrelationships between the soil morphology, mineralogy, and hydrology, particularly as these pertain …
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