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Abstract:

The early Miocene Santa Cruz Formation (SCF) in southern Patagonia hosts the Santacrucian South American Land Mammal Age (SALMA), whose age is known mainly from exposures along the Atlantic coast. Zircon U-Pb ages were obtained from intercalated tuffs from four inland sections of the SCF: 17.36 ± 0.63 Ma for the westernmost Río Bote locality, and 17.04 ± 0.55 Ma-16.32 ± 0.62 Ma for central Río Santa Cruz localities. All ages agree with the bounding age of underlying marine units and with equivalent strata in coastal exposures. New ages and available sedimentation rates imply time spans for each section of ~18.2 to 17.36 Ma for Río Bote and 17.45-15.63 Ma for central Río Santa Cruz (Burdigalian). These estimates support the view that deposition of the SCF began at western localities ~1 Ma earlier than at eastern localities, and that the central Río Santa Cruz localities expose the youngest SCF in southern Santa Cruz Province. Associated vertebrate faunas are consistent with our geochronologic synthesis, showing older (Notohippidian) taxa in western localities and younger (Santacrucian) taxa in central localities. The Notohippidian fauna (19.0-18.0 Ma) of the western localities is synchronous with Pinturan faunas (19.0-18.0 Ma), but older than Santacrucian faunas of the Río Santa Cruz (17.2-15.6 Ma) and coastal localities (18.0-16.2 Ma). The Santacrucian faunas of the central Río Santa Cruz localities temporally overlap Colloncuran (15.7 Ma), Friasian (16.5 Ma), and eastern Santacrucian faunas. © 2016 Elsevier Ltd.

Registro:

Documento: Artículo
Título:U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities
Autor:Cuitiño, J.I.; Fernicola, J.C.; Kohn, M.J.; Trayler, R.; Naipauer, M.; Bargo, M.S.; Kay, R.F.; Vizcaíno, S.F.
Filiación:IPGP, CENPAT-CONICET, Boulevard Almirante Brown 2915, Puerto Madryn, Chubut, U9120ACD, Argentina
Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales Bernardino Rivadavia-CONICET, Av. Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires, 1405DJR, Argentina
Departamento de Ciencias Básicas, Universidad Nacional de Luján, Ruta 5 y Avenida Constitución, Luján, Buenos Aires, 6700, Argentina
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID, United States
Instituto de Estudios Andinos (IDEAN)-CONICET, Intendente Guiraldes 2160, Ciudad Autónoma de Buenos Aires, Argentina
División Paleontología Vertebrados, Museo de La Plata, Unidades de Investigación Anexo Museo, 60 y 122, La Plata, Argentina
Comisión de Investigaciones Ceintíficas (CIC), Provincia de Buenos Aires, Argentina
Department of Evolutionary Anthropology and Division of Earth and Ocean Sciences, Duke University, Box 90383, Durham, NC 27708, United States
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Palabras clave:Chronostratigraphy; Fossil mammals; Notohippidian; Santacrucian; chronostratigraphy; fauna; fossil record; geochronology; mammal; Miocene; sedimentation rate; uranium-lead dating; zircon; Argentina; Patagonia; Mammalia; Vertebrata
Año:2016
Volumen:70
Página de inicio:198
Página de fin:210
DOI: http://dx.doi.org/10.1016/j.jsames.2016.05.007
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v70_n_p198_Cuitino

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Citas:

---------- APA ----------
Cuitiño, J.I., Fernicola, J.C., Kohn, M.J., Trayler, R., Naipauer, M., Bargo, M.S., Kay, R.F.,..., Vizcaíno, S.F. (2016) . U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities. Journal of South American Earth Sciences, 70, 198-210.
http://dx.doi.org/10.1016/j.jsames.2016.05.007
---------- CHICAGO ----------
Cuitiño, J.I., Fernicola, J.C., Kohn, M.J., Trayler, R., Naipauer, M., Bargo, M.S., et al. "U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities" . Journal of South American Earth Sciences 70 (2016) : 198-210.
http://dx.doi.org/10.1016/j.jsames.2016.05.007
---------- MLA ----------
Cuitiño, J.I., Fernicola, J.C., Kohn, M.J., Trayler, R., Naipauer, M., Bargo, M.S., et al. "U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities" . Journal of South American Earth Sciences, vol. 70, 2016, pp. 198-210.
http://dx.doi.org/10.1016/j.jsames.2016.05.007
---------- VANCOUVER ----------
Cuitiño, J.I., Fernicola, J.C., Kohn, M.J., Trayler, R., Naipauer, M., Bargo, M.S., et al. U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities. J. South Am. Earth Sci. 2016;70:198-210.
http://dx.doi.org/10.1016/j.jsames.2016.05.007