The precise temporal calibration of dinosaur origins
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 bio...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00278424_v113_n3_p509_Marsicano |
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todo:paper_00278424_v113_n3_p509_Marsicano2023-10-03T14:38:13Z The precise temporal calibration of dinosaur origins Marsicano, C.A. Irmis, R.B. Mancuso, A.C. Mundil, R. Chemale, F. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00278424_v113_n3_p509_Marsicano |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Marsicano, C.A. Irmis, R.B. Mancuso, A.C. Mundil, R. Chemale, F. The precise temporal calibration of dinosaur origins |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Marsicano, C.A. Irmis, R.B. Mancuso, A.C. Mundil, R. Chemale, F. |
| author_facet |
Marsicano, C.A. Irmis, R.B. Mancuso, A.C. Mundil, R. Chemale, F. |
| author_sort |
Marsicano, C.A. |
| title |
The precise temporal calibration of dinosaur origins |
| title_short |
The precise temporal calibration of dinosaur origins |
| title_full |
The precise temporal calibration of dinosaur origins |
| title_fullStr |
The precise temporal calibration of dinosaur origins |
| title_full_unstemmed |
The precise temporal calibration of dinosaur origins |
| title_sort |
precise temporal calibration of dinosaur origins |
| url |
http://hdl.handle.net/20.500.12110/paper_00278424_v113_n3_p509_Marsicano |
| work_keys_str_mv |
AT marsicanoca theprecisetemporalcalibrationofdinosaurorigins AT irmisrb theprecisetemporalcalibrationofdinosaurorigins AT mancusoac theprecisetemporalcalibrationofdinosaurorigins AT mundilr theprecisetemporalcalibrationofdinosaurorigins AT chemalef theprecisetemporalcalibrationofdinosaurorigins AT marsicanoca precisetemporalcalibrationofdinosaurorigins AT irmisrb precisetemporalcalibrationofdinosaurorigins AT mancusoac precisetemporalcalibrationofdinosaurorigins AT mundilr precisetemporalcalibrationofdinosaurorigins AT chemalef precisetemporalcalibrationofdinosaurorigins |
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1807318525930373120 |