PBDB Collection

Segundas Barrancas Blancas (SBB) - Estancia Cordón Alto (ECA1 & ECA2) (Miocene of Argentina)

Where: Santa Cruz, Argentina (50.3° S, 70.3° W: paleocoordinates 50.9° S, 64.7° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• Segundas Barrancas Blancas (SBB; 16.47–15.3 Ma), with three sites, Estancia Cordón Alto1 (ECA), Estancia Cordón Alto2 (ECA2), and Estancia el Tordillo (EET);

• formation-level stratigraphic resolution

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

• Floodplain deposits with paleosols, Sheet flood – crevasse splay deposits and Fluvial channel deposits

• The SCF here in the SBB is composed of fine-grained sediments of FAs 1 and 2, although conspicuous lenticular sandstone bodies of FA3 are observed (Fig. 10). The sections are locally correlated using a tuff layer (CECA-2 tuff; Cuitiño et al., 2016) and tabular, laterally extensive and distinctive yellow beds (Figs. 10 and 11). The CECA-2 tuff layer is about 1 m thick (Fig. 10.3) and was dated at the EET1 Section by Cuitiño et al. (2016) with an age of 16.32 ± 0.62 Ma. This tuff allows the correlation of Section EET1 with Section ECA1 (Fig. 11) 3.5 km away. Conspicuous yellow beds also used for correlation are a package of about 10 m of fine-grained sediments assigned to FA1 that contains two or three layers that contrast in color with the remaining beds of the SCF (Fig. 10). These beds were used to correlate sections EET2, ECA2 and ECA1 (Fig. 11). Although present in Section ECA, the yellow layers are barely visible due to the presence of thick lenticular sandstone deposits that partly erode them (Figs. 10.1 and 11). Finally, due to the lack of guide levels, Section Point 9 was located in the correlation scheme according to its elevation above sea level (Fig. 11).

Size classes: macrofossils, mesofossils

Collected by Fernicola et al 2014 in 2013-2014

• Recent fieldwork carried out between 2013 and 2014 by joint expeditions of the MLP, MACN, and Duke University

Primary reference: M. Arnal, M. G. Vucetich, D. A. Croft, M. S. Bargo, J. C. Fernícola and S. F. Viscaino. 2017. Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich 1965 (Rodentia, Caviomorpha, Octodontoidea). Ameghiniana 54(3):307-330 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 210638: authorized by Philip Mannion, entered by Miranta Kouvari on 10.06.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Paucituberculata - Abderitidae	Abderites meridionalis³ Abderites meridionalis³ Ameghino 1887 marsupial
Paucituberculata - Palaeothentidae	Acdestis oweni³, Palaeothentes lemoinei³, Palaeothentes intermedius³, Palaeothentes minutus³ Acdestis oweni³ Ameghino 1887 marsupial Palaeothentes lemoinei³ Ameghino 1887 marsupial Palaeothentes intermedius³ Ameghino 1887 marsupial Palaeothentes minutus³ Ameghino 1887 marsupial
Microbiotheria - Microbiotheriidae	Microbiotherium tehuelchum³ Microbiotherium tehuelchum³ Ameghino 1887 marsupial
Sparassodonta -	Perathereutes pungens³, Sipalocyon gracilis³, Cladosictis patagonica³ Perathereutes pungens³ Ameghino 1891 metatherian Sipalocyon gracilis³ Ameghino 1887 metatherian Cladosictis patagonica³ Ameghino 1887 metatherian
Sparassodonta - Borhyaenidae	Borhyaena tuberata³ Borhyaena tuberata³ Ameghino 1887 metatherian
Panameriungulata - Proterotheriidae	Diadiaphorus majusculus⁷, Anisolophus floweri⁷, Thoatherium minusculum⁷, Tetramerorhinus lucarius⁷, Tetramerorhinus cingulatum⁷ Diadiaphorus majusculus⁷ Ameghino 1887 placental Anisolophus floweri⁷ Ameghino 1887 placental Thoatherium minusculum⁷ Ameghino 1887 placental Tetramerorhinus lucarius⁷ Ameghino 1894 placental Tetramerorhinus cingulatum⁷ Ameghino 1891 placental
Panameriungulata - Macraucheniidae	Theosodon sp.⁷ Theosodon sp.⁷ Ameghino 1887 placental
Placentalia -	Rodentia indet.¹ Rodentia indet.¹ Bowdich 1821 rodent
Rodentia -	Caviomorpha indet.¹ Caviomorpha indet.¹ caviomorph
Rodentia - Chinchillidae	Prolagostomus sp.¹, cf. Prolagostomus sp.¹, Prolagostomus pusillus¹, cf. Pliolagostomus sp.¹, Pliolagostomus sp.¹, Pliolagostomus notatus¹ Prolagostomus sp.¹ Ameghino 1887 chinchilid cf. Prolagostomus sp.¹ Ameghino 1887 chinchilid Prolagostomus/Pliolagostomus Prolagostomus pusillus¹ Ameghino 1887 chinchilid cf. Pliolagostomus sp.¹ Ameghino 1887 chinchilid Pliolagostomus/Prolagostomus Pliolagostomus sp.¹ Ameghino 1887 chinchilid Pliolagostomus notatus¹ Ameghino 1887 chinchilid
Rodentia -	Eocardia sp.¹, Eocardia montana¹, Eocardia excavata¹, Neoreomys sp.¹, cf. Neoreomys sp.¹, Neoreomys australis¹ Eocardia sp.¹ Ameghino 1887 caviomorph Eocardia montana¹ Ameghino 1887 caviomorph Eocardia excavata¹ Ameghino 1891 caviomorph “Eocardia” excavata Neoreomys sp.¹ Ameghino 1887 caviomorph cf. Neoreomys sp.¹ Ameghino 1887 caviomorph Neoreomys australis¹ Ameghino 1887 caviomorph
Rodentia - Eocardiidae	Phanomys sp.¹ Phanomys sp.¹ Ameghino 1887 caviomorph
Rodentia -	Steiromys sp.¹, Steiromys detentus¹, Steiromys duplicatus¹, Chinchilloidea indet.¹ Steiromys sp.¹ Ameghino 1887 caviomorph Steiromys? Steiromys detentus¹ Ameghino 1887 caviomorph Steiromys duplicatus¹ Ameghino 1887 caviomorph Chinchilloidea indet.¹ Bennett 1833 caviomorph
Rodentia - Dinomyidae	Scleromys sp.¹, cf. Scleromys sp.¹ Scleromys sp.¹ Ameghino 1887 caviomorph cf. Scleromys sp.¹ Ameghino 1887 caviomorph
Rodentia - Neoepiblemidae	Perimys sp.¹, Perimys erutus¹, Perimys onustus¹ Perimys sp.¹ Ameghino 1887 caviomorph Perimys erutus¹ Ameghino 1887 caviomorph Perimys onustus¹ Ameghino 1887 caviomorph
Rodentia -	Octodontoidea indet.¹, Acarechimys sp.¹, Acarechimys constans, Acarechimys minutissimus, cf. Acarechimys minutissimus¹, Acarechimys gracilis, Acarechimys minutus¹, Prospaniomys "sp. nov.?"¹ Octodontoidea indet.¹ Waterhouse 1839 caviomorph Acarechimys sp.¹ Patterson 1965 caviomorph Acarechimys constans Ameghino 1887 caviomorph MPM-PV 15091 MPM-PV 15092 MPM-PV 15093 MPM-PV 15094 MPM-PV 15095 MPM-PV 15096 MPM-PV 15097 Acarechimys minutissimus Ameghino 1887 caviomorph MPM-PV 15098 MPM-PV 15099 MPM-PV 15100 MPM-PV 15101 MPM-PV 15102 MPM-PV 17426 MPM-PV 17427 cf. Acarechimys minutissimus¹ Ameghino 1887 caviomorph Acarechimys gracilis Ameghino 1891 caviomorph MPM-PV 17430 MPM-PV 17431 MPM-PV 17432 MPM-PV 17433 MPM-PV 17434 Acarechimys minutus¹ Patterson and Pascual 1967 caviomorph Prospaniomys "sp. nov.?"¹ Ameghino 1902 caviomorph MPM-PV 20560
Rodentia - Octodontidae	Sciamys sp.¹, Sciamys latidens¹, Sciamys principalis¹ Sciamys sp.¹ Ameghino 1887 caviomorph Sciamys latidens¹ caviomorph Sciamys principalis¹ Ameghino 1887 caviomorph
Rodentia -	Dudumus "sp. nov.?"¹, Spaniomys sp.¹, Spaniomys riparius¹ Dudumus "sp. nov.?"¹ Arnal et al. 2014 caviomorph MPM-PV 20561 Spaniomys sp.¹ Ameghino 1877 caviomorph Spaniomys riparius¹ Ameghino 1887 caviomorph
Rodentia - Acaremyidae	Acaremyidae indet.¹, Acaremys murinus¹ Acaremyidae indet.¹ Wood 1949 caviomorph Acaremys murinus¹ Ameghino 1887 caviomorph
Rodentia -	Stichomys sp.¹, cf. Stichomys sp.¹, Stichomys regularis¹ Stichomys sp.¹ Ameghino 1887 caviomorph cf. Stichomys sp.¹ Ameghino 1887 caviomorph Stichomys/ Adelphomys Stichomys regularis¹ Ameghino 1887 caviomorph
- Mylodontidae	Nematherium longirostris² Nematherium longirostris² Ameghino 1891 edentate
Megatherioidea - Megalonychidae	Hapalops cf. elongatus² Hapalops cf. elongatus² Ameghino 1891 edentate
Megatherioidea - Nothrotheriidae	Xyophorus atlanticus² Xyophorus atlanticus² Ameghino 1891 edentate
Megatherioidea - Megatheriidae	Planopinae indet.² Planopinae indet.² Ameghino 1887 edentate
Megatherioidea -	Schismotherium cf. fractum² Schismotherium cf. fractum² Ameghino 1887 edentate
Notoungulata - Homalodotheriidae	Homalodotherium sp.⁶ Homalodotherium sp.⁶ Huxley 1870 notoungulate
Notoungulata - Toxodontidae	Nesodon sp.⁶, Adinotherium sp.⁶, Adinotherium ovinum⁶ Nesodon sp.⁶ Owen 1846 notoungulate Adinotherium sp.⁶ Ameghino 1887 notoungulate Adinotherium ovinum⁶ Owen 1846 notoungulate
Notoungulata - Hegetotheriidae	Hegetotherium mirabile⁶, Pachyrukhos moyani⁶ Hegetotherium mirabile⁶ Ameghino 1887 notoungulate Pachyrukhos moyani⁶ Ameghino 1885 notoungulate
Notoungulata - Interatheriidae	Interatherium sp.⁶, Protypotherium sp.⁶, "Protypotherium praerutilum" = Protypotherium praerutilum⁵, "Protypotherium attenuatum" = Protypotherium praerutilum⁶, Protypotherium australe⁶ Interatherium sp.⁶ Ameghino 1887 notoungulate Protypotherium sp.⁶ Ameghino 1882 notoungulate "Protypotherium praerutilum" = Protypotherium praerutilum⁵ Ameghino 1887 notoungulate MPM-PV 19642, MPM-PV 19639 "Protypotherium attenuatum" = Protypotherium praerutilum⁶ Ameghino 1887 notoungulate Protypotherium australe⁶ Moreno 1882 notoungulate
Astrapotheria - Astrapotheriidae	Astrapotherium sp.⁶ Astrapotherium sp.⁶ Burmeister 1879 placental
Aves
Gruiformes - Phorusrhacidae	Psilopterus sp.⁴ Psilopterus sp.⁴ Moreno and Mercerat 1891 terror bird MPM-PV 18902

¹Arnal et al. 2019; ²Bargo et al. 2019; ³Chornogubsky et al. 2019; ⁴Diederle and Noriega 2019; ⁵Fernández et al. 2023; ⁶Fernández and Muñoz 2019; ⁷Schmidt et al. 2019