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Cited by 192Paleontology and Evolutionary BiologyEvolution and Paleontology StudiesPaleontology and Stratigraphy of Fossils

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Vertebrate succession in the Ischigualasto Formation

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Martínez, Ricardo N., Apaldetti, Cecilia, Alcober, Oscar A., Colombi, Carina E., Sereno, Paul C., Fernandez, Eliana, Malnis, Paula Santi, Correa, Gustavo A., Abelin, Diego·2012·Journal of Vertebrate Paleontology
DOI 10.1080/02724634.2013.818546
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Abstract

The Upper Triassic (Carnian–Norian) Ischigualasto Formation has yielded a diverse vertebrate fauna that records the initial phase of dinosaur evolution. Radioisotopic dates from ash layers within the formation provide a chrono- stratigraphic framework, and stratigraphic and sedimetological studies have subdivided the formation into four members and three abundance-based biozones. We describe two new basal dinosauromorphs, an unnamed lagerpetid and a new silesaurid, Ignotosaurus fragilis, gen. et sp. nov., which increase to 29 the number of vertebrates in the Ischigualasto fauna. We provide a census of 848 fossil specimens representing 26 vertebrate taxa logged to stratigraphic intervals of 50 m. This temporally calibrated census shows that abundance and taxonomic diversity within the Ischigualasto Formation does not change suddenly but rather appears to gradually decline in response to climatic deterioration. The only abrupt shift in faunal composition occurs at the end of the second of three biozones, when the abundant cynodont Exaeretodon is replaced by the rare dicynodont Jachaleria. RESUMEN—La Formación Ischigualasto del Triásico Superior (Carniano-Noriano) ha producido una diversa fauna de vertebrados que registra la fase inicial de la evolución de los dinosaurios. Edades radioisotópicas obtenidas de capas de ceniza constituyen un marco cronoestratigráfico y estudios estratigráficos y sedimentológicos permitieron subdividir la formación en cuatro miembros y tres biozonas…

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  • Late Carnian strata of the lower portion of the Ischigualasto Formation have yielded skeletal remains representing the two major clades of dinosaurs, Saurischia and Ornithischia, including multiple taxa referable to each of the two major saurischian subclades, sauropodomorphs and theropods, and a nondinosaurian dinosauriform.

    “Late Carnian strata of the lower portion of the Ischigualasto Formation of the Agua de la Peña Group in the Ischigualasto–Villa Unión Basin of northwestern Argentina have yielded skeletal remains representing the two major clades of dinosaurs, Saurischia and Ornithischia, including multiple taxa referable to each of the two major saurischian subclades, sauropodomorphs and theropods, and a nondinos”

    From Dating the origin of dinosaurs (2016) · cites this paper as [7]

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Authors
Martínez, R. N., Apaldetti, C., Alcober, O. A., Colombi, C. E., Sereno, P. C., Fernandez, E., Malnis, P. S., Correa, G. A., & Abelin, D.
Affiliations
  • National University of San Juan (AR)
  • Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
  • University of Chicago (US)
ORCID
Venue
Journal of Vertebrate Paleontology
Publisher
Informa UK Limited
Published
2012-11
Volume
32
Issue
sup1
Pages
10-30
ISSN
  • 0272-4634 (ISSN-L)
  • 1937-2809
DOI
10.1080/02724634.2013.818546
OpenAlex
W1990982324
Cited by
192
References
0
Citations by year
2026: 10 · 2025: 18 · 2024: 22 · 2023: 12 · 2022: 19 · 2021: 19 · 2020: 21 · 2019: 14 · 2018: 14 · 2017: 16 · 2016: 11 · 2015: 5 · 2014: 7 · 2012: 4
FWCI
3.79
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • Journal of Vertebrate Paleontology (publishedVersion)
  • BioOne Complete (BioOne) (submittedVersion)
  • CONICET Digital (CONICET) (submittedVersion, cc-by-nc-sa)
Funders
  • Earthwatch Institute
  • Universidad Nacional de San Juan
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
Ischigualasto Formation, dinosaur evolution, Silesauridae, new genus and species, biostratigraphy, biozones, taxonomic diversity, animal abundance, climate deterioration, Upper Triassic

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