Bottom-Water Conditions in a Marine Basin after the Cretaceous–Paleogene Impact Event: Timing the Recovery of Oxygen Levels and Productivity Sosa-Montes de Oca, Claudia Martínez Ruiz, Francisca Rodríguez Tovar, Francisco J. Cretaceous period Marine geology Oxygen Sediment Species extinction Trace elements An ultra-high-resolution analysis of major and trace element contents from the Cretaceous–Paleogene boundary interval in the Caravaca section, southeast Spain, reveals a quick recovery of depositional conditions after the impact event. Enrichment/depletion profiles of redox sensitive elements indicate significant geochemical anomalies just within the boundary ejecta layer, supporting an instantaneous recovery –some 102 years– of pre-impact conditions in terms of oxygenation. Geochemical redox proxies point to oxygen levels comparable to those at the end of the Cretaceous shortly after impact, which is further evidenced by the contemporary macrobenthic colonization of opportunistic tracemakers. Recovery of the oxygen conditions was therefore several orders shorter than traditional proposals (104–105 years), suggesting a probable rapid recovery of deep-sea ecosystems at bottom and in intermediate waters. 2014-02-17T12:53:08Z 2014-02-17T12:53:08Z 2013-12 info:eu-repo/semantics/article Sosa-Montes de Oca, C.; Martínez-Ruiz, F.; Rodríguez-Tovar, F.J. Bottom-Water Conditions in a Marine Basin after the Cretaceous–Paleogene Impact Event: Timing the Recovery of Oxygen Levels and Productivity. Plos One, 8(12): e82242 (2013). [http://hdl.handle.net/10481/30474] 1932-6203 doi: 10.1371/journal.pone.0082242 http://hdl.handle.net/10481/30474 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Public Library of Science (PLOS)