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New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations

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dc.contributor.author Clyde, William C. en
dc.contributor.author Wilf, Peter en
dc.contributor.author Iglesias, Ari en
dc.contributor.author Slingerland, Rudy L. en
dc.contributor.author Barnum, Timothy en
dc.contributor.author Bijl, Peter K. en
dc.contributor.author Bralower, Timothy J. en
dc.contributor.author Brinkhuis, Henk en
dc.contributor.author Comer, Emily E. en
dc.contributor.author Huber, Brian T. en
dc.contributor.author Ibañez-Mejia, Mauricio en
dc.contributor.author Jicha, Brian R. en
dc.contributor.author Krause, J. M. en
dc.contributor.author Schueth, Jonathan D. en
dc.contributor.author Singer, Bradley S. en
dc.contributor.author Raigemborn, María Sol en
dc.contributor.author Schmitz, Mark D. en
dc.contributor.author Sluijs, Appy en
dc.contributor.author Zamaloa, María del Carmen en
dc.date.accessioned 2015-04-20T15:15:33Z
dc.date.available 2015-04-20T15:15:33Z
dc.date.issued 2014
dc.identifier.citation Clyde, William C., Wilf, Peter, Iglesias, Ari, Slingerland, Rudy L., Barnum, Timothy, Bijl, Peter K., Bralower, Timothy J., Brinkhuis, Henk, Comer, Emily E., Huber, Brian T., Ibañez-Mejia, Mauricio, Jicha, Brian R., Krause, J. M., Schueth, Jonathan D., Singer, Bradley S., Raigemborn, María Sol, Schmitz, Mark D., Sluijs, Appy, and Zamaloa, María del Carmen. 2014. "New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations." <em>Geological Society of America Bulletin</em>. 126 (3/4):289&ndash;306. <a href="https://doi.org/10.1130/B30915.1">https://doi.org/10.1130/B30915.1</a> en
dc.identifier.issn 0016-7606
dc.identifier.uri http://hdl.handle.net/10088/25354
dc.description.abstract The Salamanca Formation of the San Jorge Basin (Patagonia, Argentina) preserves critical records of Southern Hemisphere Paleocene biotas, but its age remains poorly resolved, with estimates ranging from Late Cretaceous to middle Paleocene. We report a multi-disciplinary geochronologic study of the Salamanca Formation and overlying Río Chico Group in the western part of the basin. New constraints include (1) an 40Ar/39Ar age determination of 67.31 ± 0.55 Ma from a basalt flow underlying the Salamanca Formation, (2) micropaleontological results indicating an early Danian age for the base of the Salamanca Formation, (3) laser ablation HR-MC-ICP-MS (laser ablation high resolution-multi collector-inductively coupled plasma-mass spectrometry) U-Pb ages and a high-resolution TIMS (thermal ionization mass spectrometry) age of 61.984 ± 0.041(0.074)0.100] Ma for zircons from volcanic ash beds in the Peñas Coloradas Formation (Río Chico Group), and (4) paleomagnetic results indicating that the Salamanca Formation in this area is entirely of normal polarity, with reversals occurring in the Río Chico Group. Placing these new age constraints in the context of a sequence stratigraphic model for the basin, we correlate the Salamanca Formation in the study area to Chrons C29n and C28n, with the Banco Negro Inferior (BNI), a mature widespread fossiliferous paleosol unit at the top of the Salamanca Formation, corresponding to the top of Chron C28n. The diverse paleobotanical assemblages from this area are here assigned to C28n (64.67 63.49 Ma), ~2 3 million years older than previously thought, adding to growing evidence for rapid Southern Hemisphere floral recovery after the Cretaceous-Paleogene extinction. Important Peligran and &quot;Carodnia&quot; zone vertebrate fossil assemblages from coastal BNI and Peñas Coloradas exposures are likely older than previously thought and correlate to the early Torrejonian and early Tiffanian North American Land Mammal Ages, respectively. en
dc.relation.ispartof Geological Society of America Bulletin en
dc.title New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations en
dc.type Journal Article en
dc.identifier.srbnumber 118568
dc.identifier.doi 10.1130/B30915.1
rft.jtitle Geological Society of America Bulletin
rft.volume 126
rft.issue 3/4
rft.spage 289
rft.epage 306
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 289
dc.citation.epage 306


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