{"refrec":{"BRefID":323205,"RR":"<b>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.</b> (2019). A seismically induced onshore surge deposit at the KPg boundary, North Dakota. <i>Proc. Natl. Acad. Sci. U.S.A. 116(17)</i>: 8190-8199. <a href=\"https://dx.doi.org/10.1073/pnas.1817407116\" target=\"_blank\">https://dx.doi.org/10.1073/pnas.1817407116</a>","BEntID":316677,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Proc. Natl. Acad. Sci. U.S.A. 116(17)</i>: 8190-8199. <a href=\"https://dx.doi.org/10.1073/pnas.1817407116\" target=\"_blank\">https://dx.doi.org/10.1073/pnas.1817407116</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"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.","OrigTitleTranslFlag":0,"Authorstringtrunc":"DePalma, R.A. <i>et al.</i>","Englishabstract":"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, highenergy 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 M-w similar to 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.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"A seismically induced onshore surge deposit at the KPg boundary, North Dakota","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:32:28.821786","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"KPg extinction; Chicxulub; Hell Creek Formation; tsunami; impact","OtherDescriptors":null,"Notes":null,"AnaPub":2019,"MonPub":null,"DateUpdate":"2020-04-15","DateCreate":"2020-04-07","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000465363700023","VABBcode":null,"OpenAcc":1,"DOI":"10.1073/pnas.1817407116"},"refs":null,"anarec":{"AnaID":323205,"PubliDate":2019,"Pagination":"8190-8199","XtraPublOfAnaID":null,"ISBN":null,"Volume":"116","Issue":"17","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43690,"SerRR":"Proceedings of the National Academy of Sciences of the United States of America. 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