{"refrec":{"BRefID":355846,"RR":"<b>de la Parra, F.; Jaramillo, C.; Kaskes, P.; Goderis, S.; Claeys, P.; Villasante-Marcos, V.; Bayona, G.; Hatsukawa, Y.; Caballero, D.</b> (2022). Unraveling the record of a tropical continental Cretaceous-Paleogene boundary in northern Colombia, South America. <i>J. South Am. Earth Sci. 114</i>: 103717. <a href=\"https://dx.doi.org/10.1016/j.jsames.2022.103717\" target=\"_blank\">https://dx.doi.org/10.1016/j.jsames.2022.103717</a>","BEntID":353560,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>J. South Am. Earth Sci. 114</i>: 103717. <a href=\"https://dx.doi.org/10.1016/j.jsames.2022.103717\" target=\"_blank\">https://dx.doi.org/10.1016/j.jsames.2022.103717</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":1,"Authorstring":"de la Parra, F.; Jaramillo, C.; Kaskes, P.; Goderis, S.; Claeys, P.; Villasante-Marcos, V.; Bayona, G.; Hatsukawa, Y.; Caballero, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"de la Parra, F. <i>et al.</i>","Englishabstract":"The Cretaceous-Paleogene (K-Pg) boundary event, triggered by the Chicxulub asteroid impact in Mexico ∼66 Myr ago, is recognized as one of the major environmental crises in Earth's history. Its effects on the evolution of tropical vegetation were drastic, giving rise to the closed-canopy tropical rainforest. Despite of its importance, the actual K-Pg boundary event layer has not yet been identified in terrestrial sections within tropical latitudes. Here, we study a sediment core (Diablito-1) from northern Colombia and described its lithofacies, palynostratigraphic content, magnetic susceptibility and geochemical composition, including the concentration of key elements linked to a meteoritic contribution such as iridium. We found an 8.2 cm-thick (0.27 inches) interval with gravel-size calcareous intraclasts, broken skeletal fragments and siliceous spherules that were transported during a short-duration high-energy event into the coastal plain. Very fine-to medium-grained spherules, concentrated in several layers of the flow structure, could be interpreted as derived from the K-Pg impact event. This thin intraclastic packstone interval lies within the extinction level of the palynomorph <i>Echimonocolpites franciscoi</i>, an important biostratigraphic event associated with the K-Pg boundary in Colombia. In addition, this layer is associated with both a small iridium anomaly and high concentration of several other major and trace elements that are occurring above a low Magnetic Susceptibility (MS) interval and within the initial phase of a high MS interval. These lines of evidence support the position of the K-Pg event layer within the thin interval that includes the spherules in the Diablito-1 core.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Unraveling the record of a tropical continental Cretaceous-Paleogene boundary in northern Colombia, South America","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-23 01:33:18.978286","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Mass extinction; Chicxulub impact; Meteorite; Cretaceous; Cenozoic; Neotropics; Palynology; Iridium; Paleogene","OtherDescriptors":null,"Notes":null,"AnaPub":2022,"MonPub":null,"DateUpdate":"2022-09-29","DateCreate":"2022-09-29","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000821067500002","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.jsames.2022.103717"},"refs":null,"anarec":{"AnaID":355846,"PubliDate":2022,"Pagination":"103717","XtraPublOfAnaID":null,"ISBN":null,"Volume":"114","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":231896,"SerRR":"Journal of South American Earth Sciences. Elsevier: Oxford; New York; .  ISSN 0895-9811; e-ISSN 1873-0647","StandardTitleSer":"Journal of South American Earth Sciences","ISSN":"0895-9811","AbbrevSer":"J. South Am. 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