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The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins.
Science. 1993 May 07; 260(5109):794-7.Sci

Abstract

(40)Ar/(39)Ar dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 +/- 0.3 million years ago. This middle Carnian age is a direct calibration of the Ischigualasto tetrapod assemblage, which includes some of the best known early dinosaurs. This age shifts last appearances of Ischigualasto taxa back into the middle Carnian, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. By 228 million years ago, the major dinosaurian lineages were established, and theropods were already important constituents of the carnivorous tetrapod guild in the Ischigualasto-Villa Unión Basin. Dinosaurs as a whole remained minor components of tetrapod faunas for at least another 10 million years.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17746113

Citation

Rogers, R R., et al. "The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins." Science (New York, N.Y.), vol. 260, no. 5109, 1993, pp. 794-7.
Rogers RR, Swisher CC, Sereno PC, et al. The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins. Science. 1993;260(5109):794-7.
Rogers, R. R., Swisher, C. C., Sereno, P. C., Monetta, A. M., Forster, C. A., & Martínez, R. N. (1993). The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins. Science (New York, N.Y.), 260(5109), 794-7.
Rogers RR, et al. The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins. Science. 1993 May 7;260(5109):794-7. PubMed PMID: 17746113.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins. AU - Rogers,R R, AU - Swisher,C C,3rd AU - Sereno,P C, AU - Monetta,A M, AU - Forster,C A, AU - Martínez,R N, PY - 1993/5/7/pubmed PY - 1993/5/7/medline PY - 1993/5/7/entrez SP - 794 EP - 7 JF - Science (New York, N.Y.) JO - Science VL - 260 IS - 5109 N2 - (40)Ar/(39)Ar dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 +/- 0.3 million years ago. This middle Carnian age is a direct calibration of the Ischigualasto tetrapod assemblage, which includes some of the best known early dinosaurs. This age shifts last appearances of Ischigualasto taxa back into the middle Carnian, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. By 228 million years ago, the major dinosaurian lineages were established, and theropods were already important constituents of the carnivorous tetrapod guild in the Ischigualasto-Villa Unión Basin. Dinosaurs as a whole remained minor components of tetrapod faunas for at least another 10 million years. SN - 0036-8075 UR - https://www.unboundmedicine.com/medline/citation/17746113/The_Ischigualasto_Tetrapod_Assemblage__Late_Triassic_Argentina__and_40Ar/39Ar_Dating_of_Dinosaur_Origins_ L2 - https://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=17746113 DB - PRIME DP - Unbound Medicine ER -
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