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dc.contributor.authorDePalma, Robert A.
dc.contributor.authorSmit, Jan
dc.contributor.authorBurnham, David A.
dc.contributor.authorKuiper, Klaudia
dc.contributor.authorManning, Phillip L.
dc.contributor.authorOleinik, Anton
dc.contributor.authorLarson, Peter
dc.contributor.authorMaurrasse, Florentin J.
dc.contributor.authorVellekoop, Johan
dc.contributor.authorRichards, Mark A.
dc.contributor.authorGurche, Loren
dc.contributor.authorAlvarez, Walter
dc.identifier.citationDePalma, R. A., Smit, J., Burnham, D. A., Kuiper, K., Manning, P. L., Oleinik, A., Larson, P., Maurrasse, F. J., Vellekoop, J., Richards, M. A., Gurche, L., & Alvarez, W. (2019). A seismically induced onshore surge deposit at the KPg boundary, North Dakota. Proceedings of the National Academy of Sciences of the United States of America, 116(17), 8190–8199.
dc.descriptionThis work is licensed under a Creative Commons Attribution 4.0 International License.en_US
dc.description.abstractThe most immediate effects of the terminal-Cretaceous Chicxulub impact, essential to understanding the global-scale environmental and biotic collapses that mark the Cretaceous–Paleogene extinction, are poorly resolved despite extensive previous work. Here, we help to resolve this by describing a rapidly emplaced, high-energy onshore surge deposit from the terrestrial Hell Creek Formation in Montana. Associated ejecta and a cap of iridium-rich impactite reveal that its emplacement coincided with the Chicxulub event. Acipenseriform fish, densely packed in the deposit, contain ejecta spherules in their gills and were buried by an inland-directed surge that inundated a deeply incised river channel before accretion of the fine-grained impactite. Although this deposit displays all of the physical characteristics of a tsunami runup, the timing (<1 hour postimpact) is instead consistent with the arrival of strong seismic waves from the magnitude Mw ∼10 to 11 earthquake generated by the Chicxulub impact, identifying a seismically coupled seiche inundation as the likely cause. Our findings present high-resolution chronology of the immediate aftereffects of the Chicxulub impact event in the Western Interior, and report an impact-triggered onshore mix of marine and terrestrial sedimentation—potentially a significant advancement for eventually resolving both the complex dynamics of debris ejection and the full nature and extent of biotic disruptions that took place in the first moments postimpact.en_US
dc.description.sponsorshipNetherlands Organization for Scientific Research Grant 864.12.005en_US
dc.description.sponsorshipUnited Kingdom Science and Technology Facilities Council (Grant STFC:ST/M001814/1)en_US
dc.publisherNational Academy of Sciencesen_US
dc.rights© 2019 the Author(s). Published by PNAS.en_US
dc.subjectKPg extinctionen_US
dc.subjectHell Creek Formationen_US
dc.titleA seismically induced onshore surge deposit at the KPg boundary, North Dakotaen_US
kusw.kuauthorDePalma, Robert A.
kusw.kuauthorBurnham, David A.
kusw.kudepartmentBiodiversity Instituteen_US
kusw.oanotesPer Sherpa Romeo 11/23/2020:

Proceedings of the National Academy of Sciences [Open panel below]Publication Information TitleProceedings of the National Academy of Sciences (PNAS) [English] ISSNs Print: 0027-8424 Electronic: 1091-6490 URL PublishersNational Academy of Sciences [Society Publisher] Published Version [pathway c]

NoneCC BY Institutional Repository, Subject Repository, Funder Designated Location, +2 PrerequisitesIf Required by Funder OA FeeThis pathway has an Open Access fee associated with it OA PublishingThis pathway includes Open Access publishing EmbargoNo Embargo LicenceCC BY Copyright OwnerAuthors Location Funder Designated Location Institutional Repository Named Repository (PubMed Central) Subject Repository Journal Website ConditionsMust link to publisher version
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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© 2019 the Author(s). Published by PNAS.
Except where otherwise noted, this item's license is described as: © 2019 the Author(s). Published by PNAS.