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dc.contributor.authorMason, Sara
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2013-10-30 12:12:23.297en
dc.date.accessioned2013-11-04T18:55:04Z
dc.date.issued2013-11-04
dc.identifier.urihttp://hdl.handle.net/1974/8453
dc.descriptionThesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2013-10-30 12:12:23.297en
dc.description.abstractResearch carried out in the Ediacaran of eastern Newfoundland focused on two projects: sedimentology of the Conception and St. John’s groups exposed on the Bonavista Peninsula; and taxonomic descriptions of the small, stemmed frondose fossils at Mistaken Point on the Avalon Peninsula. Sedimentological study of the upper Conception and lower St. John's groups at Catalina Dome on Bonavista Peninsula extends our understanding of the Conception Basin, in which the oldest known complex, deep marine organisms lived, by a factor of two. Mudstone-rich turbidites dominate the succession, and a lack of wave-generated structures or other shallow-water indicators support the interpretation that the depositional environment was deep-marine. The basal part of the succession contains seismoturbidites that show no evidence of horizontal translation, implying that deposition occurred on a flat basin plain. Strata higher in the succession exhibit horizontally slumped beds, implying a transition into slope deposition. Turbidite ripple marks show a change in paleocurrent direction from eastward to southward in the Trepassey Formation, consistent with a change from convergent to strike-slip tectonics that occurred diachronously across the basin. Volcanic ash beds are more common in the Catalina Dome succession than on the Avalon Peninsula, reflecting deposition closer to the volcanic source. These volcanic beds are associated with diverse fossil assemblages rich in rangeomorphs that locally persist into the Fermeuse Formation, in contrast with the Avalon Peninsula where the Fermeuse Formation contains only simple discoid fossils. This taphonomic window lends support to the hypothesis that the form genus Aspidella represents the holdfasts of Ediacaran fronds. Stemmed small frond fossils from Mistaken Point, Avalon Peninsula, have often been informally referred to as “featherdusters”, but due to their small size and consequent poor preservation, they have not until now been formally described. The small, stemmed fronds are more diverse than previously realized, and include representatives of taxa described from elsewhere in Newfoundland, juveniles of other Mistaken Point fronds, and two new monospecific genera. This biodiversity suggests that the basal elevated tier that the small fronds occupied was competitive, with convergent evolution of frondose taxa showing distinct architecture and constructions, but broadly similar size and shape.en_US
dc.languageenen
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectSedimentologyen_US
dc.subjectTaxonomyen_US
dc.subjectEdiacaranen_US
dc.subjectMistaken Pointen_US
dc.subjectturbiditesen_US
dc.subjectAvaloniaen_US
dc.titleSedimentology of the Catalina Dome and taxonomy of Mistaken Point small frondsen_US
dc.typeThesisen_US
dc.description.restricted-thesisI would like my thesis restricted for one year. A version of chapter 3 had been recently submitted to Journal of Paleontology that includes systematic description of two new fossil genera, and I would prefer the thesis not be publicly available until after this article is published.en
dc.description.degreeMasteren
dc.contributor.supervisorNarbonne, M. Guyen
dc.contributor.departmentGeological Sciences and Geological Engineeringen
dc.embargo.terms1825en
dc.embargo.liftdate2018-11-03


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