La Anita, Isasicursor Site II (Cretaceous of Argentina)

Also known as Estancia "Anita"; architectural element FG, ISASI 2 GPS

Where: Santa Cruz, Argentina (50.5° S, 72.6° W: paleocoordinates 52.5° S, 62.4° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Chorrillo Formation, Early/Lower Maastrichtian (70.6 - 66.0 Ma)

• middle third of the Chorrillo Formation

•The specimen comes from the outcrop of the Chorrillo Formation (lower Maastrichtian; Moyano-Paz et al., 2022). The age of this locality has been revised in Moyano-Paz et al., 2022.

•The Chorrillo Formation in Argentina is correlated to the nearby and coeval Dorotea Formation in Chile.

• bed-level stratigraphic resolution

Environment/lithology: "floodplain"; green, red mudstone

• floodplain sub-environment characterized by widespread paleosol development
• Reddish and greenish massive mudstones

Size class: macrofossils

Collected in 2020

Primary reference: D. Moyano-Paz, S. Rozadilla, F. Agnolín, E. Verad, M. D. Coronel, A. N. Varela, A. R. Gómez-Dacal, A. M. Aranciaga-Rolando, J. D'Angelo, V. Pérez-Loinaze, S. Richiano, N. Chimento, M. J. Motta, J. Sterli, M. Manabe, T. Tsuihiji, M. P. Isasi, D. G. Poiré, and F. E. Novas. 2022. The uppermost Cretaceous continental deposits at the southern end of Patagonia, the Chorrillo Formation case study (Austral-Magallanes Basin): Sedimentology, fossil content and regional implications. Cretaceous Research 130:105059 [P. Mannion/P. Mannion/P. Mannion]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 227006: authorized by Philip Mannion, entered by Philip Mannion on 19.08.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Lamniformes -
Lamniformes indet. mackerel shark
MPM-PV-22839, isolated upper lateral tooth lacking the roots
Reptilia
 Testudines - Chelidae
Hydromedusinae indet. Baur 1893 sideneck turtle
MPM-PV-22849-22856
 Testudinata -
Meiolaniformes indet. Sterli and de la Fuente 2013 turtle
MPM-PV-22858, distal end of a left humerus
 Saurischia -
Titanosauria indet. Bonaparte and Coria 1993 sauropod
MPM-PV-22863, teeth
 Ornithischia -
Isasicursor santacrucensis Novas et al. 2019 ornithopod
MPM-PV-22860, fragmentary right maxilla with a complete maxillary teeth; MPM-PV-22861, proximal end of a right ulna; MPM-PV-22862, left metatarsal III