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Upper JurassicJurassicAmmonite FaunasAmmonitesCretaceous SystemAmmonite GenusCalcareous NannofossilCarbonate PlatformStrontium Isotope CompositionEarly JurassicOrganic Carbon IsotopesSiliciclastic DepositsGeologyJ/K BoundaryTheropod DinosaurSedimentary GeologyWater DepositsSystem BoundaryLower JurassicLower Cretaceous
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