Details

Autor(en) / Beteiligte

• Davis, Sarah N.
• Soto-Acuña, Sergio
• Fernández, Roy A.
• Amudeo-Plaza, Jared
• Leppe, Marcelo A.
• Rubilar-Rogers, David
• Vargas, Alexander O.
• Clarke, Julia A.

Titel

New records of Theropoda from a Late Cretaceous (Campanian-Maastrichtian) locality in the Magallanes-Austral Basin, Patagonia, and insights into end Cretaceous theropod diversity

Ist Teil von

• Journal of South American earth sciences, 2023-02, Vol.122, p.104163, Article 104163

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The end Cretaceous mass extinction was marked by a dramatic change in biodiversity, and the extinction of all non-avian dinosaurs. To understand the diversity of dinosaur clades prior to this event, as well as recovery by avian dinosaurs (birds), we need a better understanding of the global fossil record. However, the fossil record from southern localities, particularly southernmost (>60°S) South America, has only recently begun to be described. Discoveries from Patagonia are important to accurately assess global trends in dinosaur diversity, particularly during the latest Cretaceous before the Cretaceous/Paleogene (K/Pg) mass extinction event. Here we describe new theropod dinosaur specimens, representing both associated material and isolated elements, from Upper Cretaceous (Campanian-Maastrichtian) deposits of the Río de las Chinas Valley, Magallanes-Austral Basin, Chile. These discoveries include the southern-most known occurrences of several theropod clades outside of Antarctica, including megaraptorids, unenlagiines, enantiornithines and ornithurines. Notably, these remains provide much needed time-constrained records of smaller theropods, including birds, which are less often recovered from Upper Cretaceous deposits. While fragmentary, these fossils are the first records of theropods from Chilean Patagonia, and provide insight into the distribution of avian and non-avian theropods in southern high latitude ecosystems prior to the K/Pg mass extinction event. Sampling from this region is still sparse, and more fossils from age-controlled sections are needed to accurately assess global extinction dynamics through the end Cretaceous. •We describe theropod dinosaur fossils from a time constrained, Late Cretaceous locality in southern Chilean Patagonia.•Newly described fossils represent the latest Cretaceous dinosaur records from Chile, including enantiornithine and ornithurine birds.•These fossils provide new data for discussions of end Cretaceous theropod diversity and avian survivorship.