Vertebrate Succession in the Ischigualasto Formation

  title={Vertebrate Succession in the Ischigualasto Formation},
  author={Ricardo N. Mart{\'i}nez and Cecilia Apaldetti and Oscar A. Alcober and Carina E. Colombi and Paul C. Sereno and Eliana Fern{\'a}ndez and Paula Santi Malnis and Gustavo A. Correa and Diego Abel{\'i}n},
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… 

Vertebrate Taphonomy of the Ischigualasto Formation

ABSTRACT Trends of preservation are established on the basis of 385 fossil occurrences in the Ischigualasto Formation. The distribution and preservational quality of vertebrate fossils are related

Africa's oldest dinosaurs reveal early suppression of dinosaur distribution.

The vertebrate lineages that would shape Mesozoic and Cenozoic terrestrial ecosystems originated across Triassic Pangaea1-11. By the Late Triassic (Carnian stage, ~235 million years ago),

A Review of Vertebrate Beak Morphologies in the Triassic; A Framework to Characterize an Enigmatic Beak from the Ischigualasto Formation, San Juan, Argentina

A unique fossil beak from the Late Triassic Ischigualasto Formation, San Juan, Argentina, is described and placed in similarity analysis alongside other vertebrate clades from the Triassic Period, or with Triassic origins.

Araucariaceous fossil woods from the Upper Triassic Ischigualasto Formation (San Juan Province, Argentina): paleofloristic and paleoclimatic implications

Abstract. In this contribution, fossil woods from the Valle de La Luna Member of the Upper Triassic Ischigualasto Formation at Ischigualasto Provincial Park, San Juan Province, Argentina, are

Supradapedon revisited: geological explorations in the Triassic of southern Tanzania

A field trip conducted in July 2015 to the vicinities of Tunduru and Msamara, Ruvuma Region, Tanzania, in search of fossil discoveries was unsuccessful, but the geological mapping conducted during the trip improved knowledge of the deposition systems of the southern margin of the Selous Basin during the Triassic, allowing tentative correlations to its central part and to neighbouring basins.

Archosauromorph Remains from the Tarjados Formation (Early—Middle Triassic, NW Argentina)

Abstract. The Agua de la Peña Group of the Ischigualasto-Villa Unión Basin (northwestern Argentina) documents the evolution of archosauromorph assemblages in western Gondwana during the late Middle



Vertebrate Taphonomy of the Ischigualasto Formation

ABSTRACT Trends of preservation are established on the basis of 385 fossil occurrences in the Ischigualasto Formation. The distribution and preservational quality of vertebrate fossils are related

A Basal Dinosaur from the Dawn of the Dinosaur Era in Southwestern Pangaea

A previously unidentified basal theropod is described, its contemporary Eoraptor is reassessed as a basal sauropodomorph, the faunal record of the Ischigualasto Formation is divided with biozones, and the formation is bracketed with 40Ar/39Ar ages.


  • J. Dzik
  • Environmental Science, Geography
  • 2003
Abstract An accumulation of skeletons of the pre-dinosaur Silesaurus opolensis, gen. et sp. nov. is described from the Keuper (Late Triassic) claystone of Krasiejów in southern Poland. The strata are

Faunal replacement in the Triassic of South America

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Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira

The analysis suggests that the dentition and diet of silesaurids, ornithischians and sauropodomorphs evolved independently from a plesiomorphic carnivorous form, and Asilisaurus demonstrates the antiquity of both Ornithodira and the dinosaurian lineage.

Large-Diameter Burrows of the Triassic Ischigualasto Basin, NW Argentina: Paleoecological and Paleoenvironmental Implications

The association of Morphotypes 1 and 2 with fluvial overbank lithologies deposited under an extremely seasonal arid climate confirms interpretations that the early appearance of burrowing behavior was employed by vertebrates in response to both temperature and moisture-stress associated with seasonally or perpetually dry Pangean paleoclimates.

A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone

The South American Late Triassic offers the most comprehensive window to the early radiation of dinosaurs, enhanced by the discovery of Sacisaurus agudoensis, a new dinosauriform from the Caturrita Formation of Brazil, which has a pair of elements forming the tip of its lower jaw hypothesized to be equivalent to the ornithischian predentary.

The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

A time-calibrated phylogeny of Archosauriformes indicates that the origin and initial diversification of archosauria occurred during the Early Triassic following the Permian-Triassic extinction.

The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida)

This analysis produces a well-resolved phylogeny, which recovers mostly traditional relationships within Avemetatarsalia, places Phytosauria as a basal crurotarsan clade, finds a close relationship between Aetosaurian and Crocodylomorpha, and recovers a monophyletic Rauisuchia comprised of two major subclades.