dc.contributor.author | DePalma, Robert A. | |
dc.contributor.author | Smit, Jan | |
dc.contributor.author | Burnham, David A. | |
dc.contributor.author | Kuiper, Klaudia | |
dc.contributor.author | Manning, Phillip L. | |
dc.contributor.author | Oleinik, Anton | |
dc.contributor.author | Larson, Peter | |
dc.contributor.author | Maurrasse, Florentin J. | |
dc.contributor.author | Vellekoop, Johan | |
dc.contributor.author | Richards, Mark A. | |
dc.contributor.author | Gurche, Loren | |
dc.contributor.author | Alvarez, Walter | |
dc.date.accessioned | 2020-11-23T15:53:54Z | |
dc.date.available | 2020-11-23T15:53:54Z | |
dc.date.issued | 2019-04-01 | |
dc.identifier.citation | DePalma, 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. https://doi.org/10.1073/pnas.1817407116 | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/30901 | |
dc.description | This work is licensed under a Creative Commons Attribution 4.0 International License. | en_US |
dc.description.abstract | The 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.sponsorship | Netherlands Organization for Scientific Research Grant 864.12.005 | en_US |
dc.description.sponsorship | United Kingdom Science and Technology Facilities Council (Grant STFC:ST/M001814/1) | en_US |
dc.publisher | National Academy of Sciences | en_US |
dc.rights | © 2019 the Author(s). Published by PNAS. | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_US |
dc.subject | KPg extinction | en_US |
dc.subject | Chicxulub | en_US |
dc.subject | Hell Creek Formation | en_US |
dc.subject | Tsunami | en_US |
dc.subject | Impact | en_US |
dc.title | A seismically induced onshore surge deposit at the KPg boundary, North Dakota | en_US |
dc.type | Article | en_US |
kusw.kuauthor | DePalma, Robert A. | |
kusw.kuauthor | Burnham, David A. | |
kusw.kudepartment | Geology | en_US |
kusw.kudepartment | Biodiversity Institute | en_US |
dc.identifier.doi | 10.1073/pnas.1817407116 | en_US |
dc.identifier.orcid | https://orcid.org/0000-0001-6977-693X | en_US |
kusw.oaversion | Scholarly/refereed, publisher version | en_US |
kusw.oapolicy | This item meets KU Open Access policy criteria. | en_US |
dc.identifier.pmid | PMC6486721 | en_US |
dc.rights.accessrights | openAccess | en_US |