Artículo

Marsicano, C.A.; Irmis, R.B.; Mancuso, A.C.; Mundil, R.; Chemale, F. "The precise temporal calibration of dinosaur origins" (2016) Proceedings of the National Academy of Sciences of the United States of America. 113(3):509-513
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Abstract:

Dinosaurs have been major components of ecosystems for over 200 million years. Although different macroevolutionary scenarios exist to explain the Triassic origin and subsequent rise to dominance of dinosaurs and their closest relatives (dinosauromorphs), all lack critical support from a precise biostratigraphically independent temporal framework. The absence of robust geochronologic age control for comparing alternative scenarios makes it impossible to determine if observed faunal differences vary across time, space, or a combination of both. To better constrain the origin of dinosaurs, we produced radioisotopic ages for the Argentinian Chañares Formation, which preserves a quintessential assemblage of dinosaurian precursors (early dinosauromorphs) just before the first dinosaurs. Our new high-precision chemical abrasion thermal ionization mass spectrometry (CA-TIMS) U-Pb zircon ages reveal that the assemblage is early Carnian (early Late Triassic), 5- to 10-Ma younger than previously thought. Combined with other geochronologic data from the same basin, we constrain the rate of dinosaur origins, demonstrating their relatively rapid origin in a less than 5-Ma interval, thus halving the temporal gap between assemblages containing only dinosaur precursors and those with early dinosaurs. After their origin, dinosaurs only gradually dominated mid- to high-latitude terrestrial ecosystems millions of years later, closer to the Triassic-Jurassic boundary.

Registro:

Documento: Artículo
Título:The precise temporal calibration of dinosaur origins
Autor:Marsicano, C.A.; Irmis, R.B.; Mancuso, A.C.; Mundil, R.; Chemale, F.
Filiación:Departamento de Ciencias Geológicas, Instituto de Estudios Andinos, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, C1428EHA, Argentina
Natural History Museum of Utah, University of Utah, Salt Lake City, UT 84108-1214, United States
Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112-0102, United States
Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, Centro Científico y Tecnológico, Consejo Nacional de Investigaciones Científicas y Técnicas-Mendoza, Mendoza, CC330, Argentina
Berkeley Geochronology Center, Berkeley, CA 94709, United States
Instituto de Geociências, Universidade de Brasília, Brasília-DF, 70864-050, Brazil
Palabras clave:Biostratigraphy; Chañares formation; Dinosaur origins; Geochronology; Triassic; zirconium; Article; biostratigraphy; Carnian; chemical abrasion thermal ionization mass spectrometry; dinosaur; end Permian mass extinction; evolution; latitude; mass spectrometry; Middle Triassic; nonhuman; priority journal; terrestrial species; Triassic; anatomy and histology; animal; Argentina; calibration; dinosaur; geography; time factor; Animals; Argentina; Biological Evolution; Calibration; Dinosaurs; Geography; Time Factors
Año:2016
Volumen:113
Número:3
Página de inicio:509
Página de fin:513
DOI: http://dx.doi.org/10.1073/pnas.1512541112
Título revista:Proceedings of the National Academy of Sciences of the United States of America
Título revista abreviado:Proc. Natl. Acad. Sci. U. S. A.
ISSN:00278424
CODEN:PNASA
CAS:zirconium, 14940-68-2, 7440-67-7
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00278424_v113_n3_p509_Marsicano

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Citas:

---------- APA ----------
Marsicano, C.A., Irmis, R.B., Mancuso, A.C., Mundil, R. & Chemale, F. (2016) . The precise temporal calibration of dinosaur origins. Proceedings of the National Academy of Sciences of the United States of America, 113(3), 509-513.
http://dx.doi.org/10.1073/pnas.1512541112
---------- CHICAGO ----------
Marsicano, C.A., Irmis, R.B., Mancuso, A.C., Mundil, R., Chemale, F. "The precise temporal calibration of dinosaur origins" . Proceedings of the National Academy of Sciences of the United States of America 113, no. 3 (2016) : 509-513.
http://dx.doi.org/10.1073/pnas.1512541112
---------- MLA ----------
Marsicano, C.A., Irmis, R.B., Mancuso, A.C., Mundil, R., Chemale, F. "The precise temporal calibration of dinosaur origins" . Proceedings of the National Academy of Sciences of the United States of America, vol. 113, no. 3, 2016, pp. 509-513.
http://dx.doi.org/10.1073/pnas.1512541112
---------- VANCOUVER ----------
Marsicano, C.A., Irmis, R.B., Mancuso, A.C., Mundil, R., Chemale, F. The precise temporal calibration of dinosaur origins. Proc. Natl. Acad. Sci. U. S. A. 2016;113(3):509-513.
http://dx.doi.org/10.1073/pnas.1512541112