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The Late Triassic Martin Bridge carbonate platform (Wallowa terrane, NW U.S.A.): sedimentology, biostratigraphy, and contribution to the understanding of aragonitic and microgranular foraminifers

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Defense Thèse de doctorat : Univ. Genève, 2012 - Sc. 4439 - 2012/06/15
Abstract On account of their number, diversity, rapid evolution, and wide distribution throughout carbonate platforms, foraminifers have proven to be reliable tools to reconstruct paleoclimatic, paleobathymetric, and paleoenvironmental changes at the origin of major crises in diversity. Markers of decline and diversification periods through time, they are also good biostratigraphic indicators. Our knowledge of Triassic foraminifers, however, is incomplete and strongly unbalanced. Triassic researches have only focused on Tethyan associations and very few investigations have been carried out in Panthalassan terranes. This study constitutes the first detailed investigation of the foraminiferal content and spatial distribution on a Triassic panthalassan carbonate platform of the United States of America. It includes the systematic description of a new suborder, two new families, seven new subfamilies, thirteen new genera, and fifteen new species of foraminifers and proposes a new approach of the sedimentological and geological history of the Late Triassic Martin Bridge Formation.
Keywords Late TriassicPanthalassaCarbonate platformWallowa terraneMartin Bridge FormationBenthic foraminifersInvolutinidaRobertinidaFusulinidaPhylogenySystematicsFunctional morphology
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URN: urn:nbn:ch:unige-259695
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Research group Sedimentology, Biostratigraphy and Micropaleontology
Project FNS: Evolution of microfaunas and sediments in the Upper Triassic: palaeogeographic and tectonic assessment as a result of reef and carbonate buildup development (REEFCADE).
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RIGAUD, Sylvain. The Late Triassic Martin Bridge carbonate platform (Wallowa terrane, NW U.S.A.): sedimentology, biostratigraphy, and contribution to the understanding of aragonitic and microgranular foraminifers. Université de Genève. Thèse, 2012. https://archive-ouverte.unige.ch/unige:25969

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Deposited on : 2013-01-28

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