And before, Jurassic!

The Jurassic (/dʒuːˈræsɪk/; from Jura Mountains) is a geologic period and system that extends from 201.3± 0.6 Ma (million years ago) to 145± 4 Ma; from the end of the Triassic to the beginning of the Cretaceous.

Research on Jurassic dinosaurs:


ISABERRYSAURA (JURASSIC, PATAGONIA, ARGENTINA): UNDERSTANDING THE EARLY EVOLUTION OF ORNITHISCHIAN DINOSAURS

The ornithischian dinosaur Isaberrysaura mollensis, consisting in an almost complete skull and incomplete postcranium, has been recently erected by Salgado et al. (2017). The holotype was collected from the marine-deltaic deposits of the Los Molles Formation (Toarcian-Bajocian), being the first reported dinosaur for this unit, one of the oldest from Neuquén Basin, and the first neornithischian dinosaur known from the Jurassic of South America. The specimen was preserved articulated and with some of its gut content -identified as seeds, most of them belonging to the Cycadales group-. The holotype (MOZ-Pv 6459) is a skeleton comprising a nearly complete skull, and a partial postcranium (still unprepared) consisting of 6 cervical vertebrae, 15 dorsal vertebrae, a sacrum with a partial ilium and an apparently complete pubis, 9 caudal vertebrae, part of a scapula, ribs, and unidentifiable fragments.

Selected fossils of Isaberrisaura mollensis showed in the Natural Science Museum of Zapala (Neuquén, Argentina),

Reference:
Salgado, L. Canudo, J.I., Garrido, A.C., Moreno-Azanza, M., Martínez, L.C.A., Coria, R.M., Gasca, J.M. 2017. A new primitive Neornithischian dinosaur from the Jurassic of Patagonia with gut contents. Scientific Reports, 7, 42778. DOI: 10.1038/srep42778

Link to the publication in Scientific Reports



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