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Re: [dinosaur] Bagualia, new sauropod from Early Jurassic of Argentina (free pdf)



The pdf is now free:

D. Pol, J. Ramezani, K. Gomez, J. L. Carballido, A. Paulina Carabajal, O. W. M. Rauhut, I. H. Escapa and N. R. CÃneo (2020)
Extinction of herbivorous dinosaurs linked to Early Jurassic global warming event.
Proceedings of the Royal Society B: Biological Sciences 287(1939): 20202310
doi: https://doi.org/10.1098/rspb.2020.2310
https://royalsocietypublishing.org/doi/10.1098/rspb.2020.2310

Free pdf:

https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2020.2310

On Wed, Nov 18, 2020 at 6:24 AM Ben Creisler <bcreisler@gmail.com> wrote:
Ben Creisler
bcreisler@gmail.com

A new paper:

Bagualia alba gen. et. sp. nov.

D. Pol, J. Ramezani, K. Gomez, J. L. Carballido, A. Paulina Carabajal, O. W. M. Rauhut, I. H. Escapa and N. R. CÃneo (2020)
Extinction of herbivorous dinosaurs linked to Early Jurassic global warming event.
Proceedings of the Royal Society B: Biological Sciences 287(1939): 20202310
doi: https://doi.org/10.1098/rspb.2020.2310
https://royalsocietypublishing.org/doi/10.1098/rspb.2020.2310



Sauropods, the giant long-necked dinosaurs, became the dominant group of large herbivores in terrestrial ecosystems after multiple related lineages became extinct towards the end of the Early Jurassic (190-174 Ma). The causes and precise timing of this key faunal change, as well as the origin of eusauropods (true sauropods), have remained ambiguous mainly due to the scarce dinosaurian fossil record of this time. The terrestrial sedimentary successions of the CaÃadÃn Asfalto Basin in central Patagonia (Argentina) document this critical interval of dinosaur evolution. Here, we report a new dinosaur with a nearly complete skull that is the oldest eusauropod known to date and provide high-precision U-Pb geochronology that constrains in time the rise of eusauropods in Patagonia. We show that eusauropod dominance was established after a massive magmatic event impacting southern Gondwana (180-184 Ma) and coincided with severe perturbations to the climate and a drastic decrease in the floral diversity characterized by the rise of conifers with small scaly leaves. Floral and faunal records from other regions suggest these were global changes that impacted the terrestrial ecosystems during the Toarcian warming event and formed part of a second-order mass extinction event.

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