Barrancas Blancas (BB) - Estancia Aguada Grande (EAG 1) (Miocene of Argentina)

Where: Santa Cruz, Argentina (50.2° S, 69.7° W: paleocoordinates 50.8° S, 64.1° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Santa Cruz Formation, Santacrucian (17.5 - 16.3 Ma)

• Arnal et al 2019: Barrancas Blancas (BB; 17.21–16.3 Ma), with two sites, Estancia Aguada Grande (EAG) and Estancia Santa Lucía (ESL)

•Cuitino et al 2019 (focused on stratigraphy) tuff was dated in 17.04 ± 0.55 by means of U/Pb on zircons (Cuitiño et al., 2016), and it is used as a marker bed to correlate with Section EAG2 (Fig. 8)

•This tuff was dated in 17.04 ± 0.55 by means of U/Pb on zircons (Cuitiño et al., 2016), and it is used as a marker bed to correlate with Section EAG2 (Fig. 8). In this part of the SCF no terrestrial fossil vertebrates were recovered

• formation-level stratigraphic resolution

Environment/lithology: "floodplain"; lenticular, tabular, paleosol/pedogenic, silty sandstone

• Floodplain deposits with paleosols, Sheet flood – crevasse splay deposits and Fluvial channel deposits
• Cuitino et al 2019: It is mostly com- posed of floodplain deposits of FAs 1 and 2.

Size classes: macrofossils, mesofossils

Collected by C. Ameghino, Fernicola et al in 2013-2014

Primary reference: M. Arnal, M. E. Perez, and C. M. Deschamps. 2019. Revision of the Miocene caviomorph rodents from the Río Santa Cruz (Argentinean Patagonia). In J. C. Fernicola, M. S. Bargo, S. F. Vizcaíno, R. F. Kay (eds.), Early–Middle Miocene Paleontology in the Río Santa Cruz, Southern Patagonia, Argentina. 130 years since Ameghino, 1887 19(2):193-229 [P. Mannion/M. Kouvari/M. Kouvari]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 210786: authorized by Philip Mannion, entered by Miranta Kouvari on 19.06.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Amphibia
 Salientia - Calyptocephalellidae
Calyptocephalella cf. canqueli5 Schaeffer 1949 helmeted water toad
Aves
 Gruiformes - Phorusrhacidae
Psilopterus sp.2 Moreno and Mercerat 1891 terror bird
MPM-PV 18901 and MPM-PV 18905
Mammalia
 Notoungulata - Interatheriidae
"Protypotherium praerutilum" = Protypotherium praerutilum3, "Protypotherium attenuatum" = Protypotherium praerutilum3, Interatherium sp.3
"Protypotherium praerutilum" = Protypotherium praerutilum3 Ameghino 1887 notoungulate
"Protypotherium attenuatum" = Protypotherium praerutilum3 Ameghino 1887 notoungulate
Interatherium sp.3 Ameghino 1887 notoungulate
 Notoungulata - Toxodontidae
Adinotherium sp.3 Ameghino 1887 notoungulate
 Astrapotheria - Astrapotheriidae
Astrapotherium sp.3 Burmeister 1879 placental
 Primates - Homunculidae
Homunculus vizcaino n. sp.4 monkey
Holotype: MPM-PV 19426
 Placentalia -
Rodentia indet. Bowdich 1821 rodent
 Rodentia -
Steiromys sp. Ameghino 1887 caviomorph
Steiromys duplicatus Ameghino 1887 caviomorph
Steiromys detentus Ameghino 1887 caviomorph
Eocardia sp. Ameghino 1887 caviomorph
Eocardia cf. excavata Ameghino 1891 caviomorph
“Eocardia” excavata?
Eocardia montana Ameghino 1887 caviomorph
 Rodentia - Eocardiidae
Phanomys sp. Ameghino 1887 caviomorph
cf. Phanomys sp. Ameghino 1887 caviomorph
Phanomys/ Eocardia
Phanomys mixtus Ameghino 1887 caviomorph
 Rodentia -
Neoreomys sp. Ameghino 1887 caviomorph
Neoreomys australis Ameghino 1887 caviomorph
 Rodentia - Dinomyidae
Scleromys sp. Ameghino 1887 caviomorph
cf. Scleromys sp. Ameghino 1887 caviomorph
 Rodentia - Neoepiblemidae
Perimys sp. Ameghino 1887 caviomorph
cf. Perimys sp. Ameghino 1887 caviomorph
Perimys/ Prolagostomus
Perimys incavatus Ameghino 1902 caviomorph
Perimys erutus Ameghino 1887 caviomorph
 Rodentia -
Octodontoidea indet. Waterhouse 1839 caviomorph
 Rodentia - Acaremyidae
Acaremyidae indet. Wood 1949 caviomorph
 Rodentia - Octodontidae
Sciamys sp. Ameghino 1887 caviomorph
Sciamys principalis Ameghino 1887 caviomorph
 Rodentia -
Acarechimys minutissimus Ameghino 1887 caviomorph
Stichomys sp. Ameghino 1887 caviomorph
Spaniomys sp. Ameghino 1877 caviomorph
Spaniomys riparius Ameghino 1887 caviomorph
 Panameriungulata - Proterotheriidae
Tetramerorhinus lucarius6 Ameghino 1894 placental
"Anisolophus australis" = Proterotherium australe6 Burmeister 1879 placental
Diadiaphorus majusculus6 Ameghino 1887 placental
 Sparassodonta -
Sipalocyon gracilis1 Ameghino 1887 metatherian
 Sparassodonta - Borhyaenidae
Borhyaena tuberata1 Ameghino 1887 metatherian
 Paucituberculata - Palaeothentidae
Palaeothentes intermedius1 Ameghino 1887 marsupial
Palaeothentes lemoinei1 Ameghino 1887 marsupial
Palaeothentes minutus1 Ameghino 1887 marsupial
Acdestis oweni1 Ameghino 1887 marsupial
 Paucituberculata - Abderitidae
Abderites meridionalis1 Ameghino 1887 marsupial