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A basal dinosaur from the dawn of the dinosaur era in southwestern Pangaea.
Science. 2011 Jan 14; 331(6014):206-10.Sci

Abstract

Upper Triassic rocks in northwestern Argentina preserve the most complete record of dinosaurs before their rise to dominance in the Early Jurassic. Here, we describe a previously unidentified basal theropod, reassess its contemporary Eoraptor as a basal sauropodomorph, divide the faunal record of the Ischigualasto Formation with biozones, and bracket the formation with (40)Ar/(39)Ar ages. Some 230 million years ago in the Late Triassic (mid Carnian), the earliest dinosaurs were the dominant terrestrial carnivores and small herbivores in southwestern Pangaea. The extinction of nondinosaurian herbivores is sequential and is not linked to an increase in dinosaurian diversity, which weakens the predominant scenario for dinosaurian ascendancy as opportunistic replacement.

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sciencemag.org
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Authors+Show Affiliations

Martinez RN
Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, San Juan 5400, Argentina.
Sereno PC
No affiliation info available
Alcober OA
No affiliation info available
Colombi CE
No affiliation info available
Renne PR
No affiliation info available
Montañez IP
No affiliation info available
Currie BS
No affiliation info available

MeSH

AnimalsArgentinaBiological EvolutionBone and BonesDinosaursExtinction, BiologicalFemurFossilsPhylogenySkullSpine

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21233386

Citation

Martinez, Ricardo N., et al. "A Basal Dinosaur From the Dawn of the Dinosaur Era in Southwestern Pangaea." Science (New York, N.Y.), vol. 331, no. 6014, 2011, pp. 206-10.
Martinez RN, Sereno PC, Alcober OA, et al. A basal dinosaur from the dawn of the dinosaur era in southwestern Pangaea. Science. 2011;331(6014):206-10.
Martinez, R. N., Sereno, P. C., Alcober, O. A., Colombi, C. E., Renne, P. R., Montañez, I. P., & Currie, B. S. (2011). A basal dinosaur from the dawn of the dinosaur era in southwestern Pangaea. Science (New York, N.Y.), 331(6014), 206-10. https://doi.org/10.1126/science.1198467
Martinez RN, et al. A Basal Dinosaur From the Dawn of the Dinosaur Era in Southwestern Pangaea. Science. 2011 Jan 14;331(6014):206-10. PubMed PMID: 21233386.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A basal dinosaur from the dawn of the dinosaur era in southwestern Pangaea. AU - Martinez,Ricardo N, AU - Sereno,Paul C, AU - Alcober,Oscar A, AU - Colombi,Carina E, AU - Renne,Paul R, AU - Montañez,Isabel P, AU - Currie,Brian S, PY - 2011/1/15/entrez PY - 2011/1/15/pubmed PY - 2011/2/1/medline SP - 206 EP - 10 JF - Science (New York, N.Y.) JO - Science VL - 331 IS - 6014 N2 - Upper Triassic rocks in northwestern Argentina preserve the most complete record of dinosaurs before their rise to dominance in the Early Jurassic. Here, we describe a previously unidentified basal theropod, reassess its contemporary Eoraptor as a basal sauropodomorph, divide the faunal record of the Ischigualasto Formation with biozones, and bracket the formation with (40)Ar/(39)Ar ages. Some 230 million years ago in the Late Triassic (mid Carnian), the earliest dinosaurs were the dominant terrestrial carnivores and small herbivores in southwestern Pangaea. The extinction of nondinosaurian herbivores is sequential and is not linked to an increase in dinosaurian diversity, which weakens the predominant scenario for dinosaurian ascendancy as opportunistic replacement. SN - 1095-9203 UR - https://www.unboundmedicine.com/medline/citation/21233386/A_basal_dinosaur_from_the_dawn_of_the_dinosaur_era_in_southwestern_Pangaea_ L2 - https://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=21233386 DB - PRIME DP - Unbound Medicine ER -