Vertebrate Succession in the Ischigualasto Formation
- Martínez, Ricardo N.
- Apaldetti, Graciela Cecilia
- Alcober, Oscar A.
- Colombi, Carina Ester
- Sereno, Paul C.
- Fernandez, Eliana
- Santi Malnis, Paula
- Correa, Gustavo Alejandro
- Abelín, Diego
DOIAbstract
The Upper Triassic (Carnian-Norian) Ischigualasto Formation has yielded a diverse vertebrate fauna that records the initial phase of the evolution of dinosaurs. Radioisotopic dates from ash layers within the formation provide a chronostratigraphic 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...
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