Segundas Barrancas Blancas (SBB) - from Estancia Cordon Alto to Ea el Tordillo (Miocene of Argentina)

Where: Santa Cruz, Argentina (50.3° S, 70.4° W: paleocoordinates 50.9° S, 64.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• Arnal et al 2019: 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: terrestrial; lithology not reported

• "90 m of horizontal strata of tabular geometry, composed of greenish and yellow siltstones and tabular to lenticular beds of gray sandstones"

Size class: mesofossils

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

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

Primary reference: J. C. Fernicola, J. I. Cuitiño, S. F. Vizcaíno, M. S. Bargo, and R. F. Kay. 2014. Fossil localities of the Santa Cruz Formation (Early Miocene, Patagonia, Argentina) prospected by Carlos Ameghino in 1887 revisited and the location of the Notohippidian. Journal of South American Earth Sciences 52:94-107 [J. Zijlstra/J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 176623: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 18.02.2016, edited by Miranta Kouvari and Kateryn Pino

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Mammalia
 Cingulata - Propalaehoplophoridae
Propalaehoplophoridae indet.4, Eucinepeltus sp.4, Cochlops sp.
Propalaehoplophoridae indet.4 Ameghino 1891 edentate
Eucinepeltus sp.4 Ameghino 1891 edentate
Cochlops sp. Ameghino 1889 edentate
 Cingulata - Chlamyphoridae
Stenotatus sp., Stenotatus patagonicus4, Proeutatus sp., "Proeutatus oenophorus" = Proeutatus oenophorum4, Prozaedyus sp., Prozaedyus proximus4
Stenotatus sp. Ameghino 1891 edentate
Stenotatus patagonicus4 Ameghino 1887 edentate
Proeutatus sp. Ameghino 1891 edentate
"Proeutatus oenophorus" = Proeutatus oenophorum4 Ameghino 1887 edentate
Prozaedyus sp. Ameghino 1891 edentate
Prozaedyus proximus4 Ameghino 1887 edentate
 Cingulata - Peltephilidae
Peltephilus sp.4, Peltephilus pumilus4
Peltephilus sp.4 Ameghino 1887 edentate
Peltephilus pumilus4 Ameghino 1887 edentate
 Megatherioidea -
Megatherioidea indet.1
Megatherioidea indet.1 Gray 1821 edentate
 Megatherioidea - Megalonychidae
Hapalops sp., cf. Hapalops sp.1
Hapalops sp. Ameghino 1887 edentate
cf. Hapalops sp.1 Ameghino 1887 edentate
 Megatherioidea - Megatheriidae
Megatheriidae indet.1, Planopinae indet.1
Megatheriidae indet.1 Gray 1821 edentate
Planopinae indet.1 Ameghino 1887 edentate
  - Mylodontidae
cf. Nematheriinae indet.1
cf. Nematheriinae indet.1 Mercerat 1891 edentate
Nematheriinae? Planopinae?
 Notoungulata - Interatheriidae
Protypotherium compressidens2, Interatherium sp., Interatherium rodens3, Interatherium extensus3
Protypotherium compressidens2 Ameghino 1891 notoungulate
MPM-PV 19761, MPM-PV 19781, MPM-PV 19782
Interatherium sp. Ameghino 1887 notoungulate
Interatherium rodens3 Moreno 1882 notoungulate
Interatherium extensus3 Fernández et al. 2023 notoungulate
 Notoungulata - Toxodontidae
Nesodon sp.
Nesodon sp. Owen 1846 notoungulate
 Rodentia -
Neoreomys sp.
Neoreomys sp. Ameghino 1887 caviomorph
 Rodentia - Neoepiblemidae
Perimys sp.
Perimys sp. Ameghino 1887 caviomorph
1Bargo et al. 2019; 2Fernández et al. 2023; 3Fernández et al. 2023; 4Fernicola and Vizcaino 2019