Abstract:
Isotopic age determinations (40Ar/39Ar) and associated magnetic polarity stratigraphy for Casamayoran age fauna at Gran Barranca (Chubut, Argentina) indicate that the Barrancan 'subage' of the Casamayoran South American Land Mammal 'Age' is late Eocene, 18 to 20 million years younger than hitherto supposed. Correlations of the radioisotopically dated magnetic polarity stratigraphy at Gran Barranca with the Cenozoic geomagnetic polarity time scale indicate that Barrancan faunal levels at the Gran Barranca date to within the magnetochronologic interval from 35.34 to 36.62 megannums (Ma) or 35.69 to 37.60 Ma. This age revision constrains the timing of an adaptive shift in mammalian herbivores toward hypsodonty. Specifically, the appearance of large numbers of hypsodont taxa in South America occurred sometime between 36 and 32 Ma (late Eocene-early Oligocene), at approximately the same time that other biotic and geologic evidence has suggested the Southern high latitudes experienced climatic cooling associated with Antarctic glaciation.
Registro:
Documento: |
Artículo
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Título: | Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications |
Autor: | Kay, R.F.; Madden, R.H.; Vucetich, M.G.; Carlini, A.A.; Mazzoni, M.M.; Re, G.H.; Heizler, M.; Sandeman, H. |
Filiación: | Dept. of Biol. Anthropol. and Anat., Duke University, Durham, NC 27710, United States Fac. de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina Dept. of Earth and Environ. Sciences, New Mex. Inst. Mining and Technol., Socorro, NM 87801, United States Department of Geological Sciences, Queen's University, Kingston, Ont. K7L 3N6, Canada
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Palabras clave: | Eocene; Mammalian evolution; Paleontology; South America; age determination; analytic method; article; chronology; cold climate; mammal; physical anthropology; priority journal; South America; wildlife; Invertebrata; Mammalia; Vertebrata |
Año: | 1999
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Volumen: | 96
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Número: | 23
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Página de inicio: | 13235
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Página de fin: | 13240
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DOI: |
http://dx.doi.org/10.1073/pnas.96.23.13235 |
Título revista: | Proceedings of the National Academy of Sciences of the United States of America
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Título revista abreviado: | Proc. Natl. Acad. Sci. U. S. A.
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ISSN: | 00278424
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CODEN: | PNASA
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PDF: | https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00278424_v96_n23_p13235_Kay.pdf |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00278424_v96_n23_p13235_Kay |
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Citas:
---------- APA ----------
Kay, R.F., Madden, R.H., Vucetich, M.G., Carlini, A.A., Mazzoni, M.M., Re, G.H., Heizler, M.,..., Sandeman, H.
(1999)
. Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications. Proceedings of the National Academy of Sciences of the United States of America, 96(23), 13235-13240.
http://dx.doi.org/10.1073/pnas.96.23.13235---------- CHICAGO ----------
Kay, R.F., Madden, R.H., Vucetich, M.G., Carlini, A.A., Mazzoni, M.M., Re, G.H., et al.
"Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications"
. Proceedings of the National Academy of Sciences of the United States of America 96, no. 23
(1999) : 13235-13240.
http://dx.doi.org/10.1073/pnas.96.23.13235---------- MLA ----------
Kay, R.F., Madden, R.H., Vucetich, M.G., Carlini, A.A., Mazzoni, M.M., Re, G.H., et al.
"Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications"
. Proceedings of the National Academy of Sciences of the United States of America, vol. 96, no. 23, 1999, pp. 13235-13240.
http://dx.doi.org/10.1073/pnas.96.23.13235---------- VANCOUVER ----------
Kay, R.F., Madden, R.H., Vucetich, M.G., Carlini, A.A., Mazzoni, M.M., Re, G.H., et al. Revised geochronology of the Casamayoran South American Land Mammal Age: Climatic and biotic implications. Proc. Natl. Acad. Sci. U. S. A. 1999;96(23):13235-13240.
http://dx.doi.org/10.1073/pnas.96.23.13235