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dc.contributor.authorKasprak, A.en
dc.contributor.authorSepulveda, J.en
dc.contributor.authorPrice-Waldman, R.en
dc.contributor.authorWilliford, K.en
dc.contributor.authorSchoepfer, S.en
dc.contributor.authorHaggart, J.en
dc.contributor.authorWard, P.en
dc.contributor.authorSummons, R.en
dc.contributor.authorWhiteside, J.en
dc.identifier.citationGeology, 2015; 43(4):307-310en
dc.description.abstractSevere changes in ocean redox, nutrient cycling, and marine productivity accompanied most Phanerozoic mass extinctions. However, evidence for marine photic zone euxinia (PZE) as a globally important extinction mechanism for the end-Triassic extinction (ETE) is currently lacking. Fossil molecular (biomarker) and nitrogen isotopic records from a sedimentary sequence in western Canada provide the first conclusive evidence of PZE and disrupted biogeochemistry in neritic waters of the Panthalassic Ocean during the end Triassic. Increasing water-column stratification and deoxygenation across the ETE led to PZE in the Early Jurassic, paralleled by a perturbed nitrogen cycle and ecological turnovers among noncalcifying groups, including eukaryotic algae and prokaryotic plankton. If such conditions developed widely in the Panthalassic Ocean, PZE might have been a potent mechanism for the ETE.en
dc.description.statementofresponsibilityAlex H. Kasprak, Julio Sepúlveda, Rosalyn Price-Waldman, Kenneth H. Williford, Shane D. Schoepfer, James W. Haggart, Peter D. Ward, Roger E. Summons, and Jessica H. Whitesideen
dc.publisherGeological Society of Americaen
dc.rights© 2015 Geological Society of Americaen
dc.titleEpisodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinctionen
dc.typeJournal articleen
Appears in Collections:Earth and Environmental Sciences publications

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