PBDB Collection

Estancia Ana María, Pinturas Fm., Lago Buenos Aires (Miocene of Argentina)

Also known as Loma de las Ranas

Where: Santa Cruz, Argentina (47.0° S, 70.7° W: paleocoordinates 47.7° S, 65.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Pinturan zone, Pinturas Formation, Burdigalian (20.4 - 16.0 Ma)

• Pertains to "Middle Sequence" = "Pinturan" of Kramarz & Bellosi 2005

•

•Brandoni et al 2016: fossils come from the middle sequence that crops at the base of a pointed hill

•Brandoni et al 2016: The absolute ages of ca. 17.99 Ma near the base of the Pinturas Formation at Estancia el Carmen (47? 120 44.6400S, 70? 340 9700W), and ca. 16.8 Ma in the Santa Cruz For- mation that overlies the Pinturas Formation at Portezuelo Sumich Norte (see Perkins et al. 2012 and Fleagle et al. 2012) (Fig. 1b) indicate that the lower and middle sequences from the Pinturas Formation would be similar in age to those from the coastal localities of the Santa Cruz Formation (‘‘typical Santacrucian fauna’’) with ages of ca. 18–16 Ma (Bown and Fleagle 1993; Fleagle et al. 1995; Tejedor et al. 2006; Perkins et al. 2012), and younger than those from the lower Fossil Zone of the Colhue-Huapi Member of the Sarmiento Formation (‘‘Colhuehuapian fauna’’) (Kramarz et al. 2010) with ages of ca. 20.4–20.0 Ma (Re´ et al. 2010) or 21.11–18.62 Ma (Dunn et al. 2013) (Fig. 2).

Environment/lithology: terrestrial; volcaniclastic sediments

• Brandoni et al 2016: The Pinturas Formation is composed of up to 100 m of Miocene continental pyroclastic and eolian epiclastic sed-iments outcropping in the upper valley of the Pinturas River and its tributaries (Fig. 1a). It lies unconformably atop the Jurassic La Matilde Formation (Bahı´a Laura River and its tributaries (Fig. 1a). It lies unconformably atop the Jurassic La Matilde Formation (Bahı´a Laura Group), and is divided by two intraformational erosional unconformities into three sequences: (a) the lower sequence, dominated by pyroclastic mudrocks upon which very mature paleosols were formed; (b) the middle sequence, composed largely by epiclastic sand occurring as barchanoid paleodunes; and (c) the upper sequence, con-sisting of massive, poorly bedded pyroclastic mudrocks (Bown et al. 1988; Bown and Larriestra 1990). The Pin-turas Formation differs from the Santa Cruz Formation in the greater volume of pyroclastic materials, absence of marine intercalations, and the presence of mature paleosols in the lower sequence (Bown and Larriestra 1990).

Size class: macrofossils

Reposited in the MACN

Primary reference: T. M. Bown and C. N. Larriestra. 1990. Sedimentary paleoenvironments of fossil platyrrhine localities, Miocene Pinturas Formation, Santa Cruz Province, Argentina. Journal of Human Evolution 19(1-2):87-119 [D. Croft/D. Croft]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 59133: authorized by Darin Croft, entered by Darin Croft on 15.03.2006, edited by Juan Carrillo, Miranta Kouvari, Grace Varnham and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Megatherioidea -	Megatherioidea indet.² Megatherioidea indet.² Gray 1821 edentate MPM-PV 17407
Primates - Pitheciidae	Pitheciidae indet.⁹ Pitheciidae indet.⁹ Mivart 1865 monkey MPM PV 17418
Primates -	Carlocebus cf. carmenensis⁸, Carlocebus carmenensis⁹ Carlocebus cf. carmenensis⁸ Fleagle 1990 monkey 1 specimen Carlocebus carmenensis⁹ Fleagle 1990 monkey MPM PV 17417 and MPM PV 17416
Primates - Homunculidae	Soriacebus adrianae⁹ Soriacebus adrianae⁹ Fleagle 1990 monkey MPM PV 17419
Rodentia -	Steiromys principalis⁴, Steiromys duplicatus⁴ Steiromys principalis⁴ Ameghino 1901 caviomorph 1 specimen Steiromys duplicatus⁴ Ameghino 1887 caviomorph 3 specimens
Rodentia - Erethizontidae	Branisamyopsis praesigmoides⁴ Branisamyopsis praesigmoides⁴ Kramarz 2004 porcupine 3 specimens
Rodentia -	Eosteiromys annectens⁴, Luantus propheticus⁵, Luantus toldensis⁵, Neoreomys australis⁶ Eosteiromys annectens⁴ Ameghino 1901 caviomorph 9 specimens Luantus propheticus⁵ Ameghino 1899 caviomorph 2 specimens Luantus toldensis⁵ Kramarz 2006 caviomorph 1 specimen Neoreomys australis⁶ Ameghino 1887 caviomorph 2 specimens
Rodentia - Dinomyidae	Scleromys quadrangulatus⁶, Scleromys osbornianus⁶ Scleromys quadrangulatus⁶ Kramarz 2006 caviomorph 4 specimens Scleromys osbornianus⁶ Ameghino 1894 caviomorph 1 specimen
Rodentia - Neoepiblemidae	Perimys intermedius³ Perimys intermedius³ Kramarz 2002 caviomorph 28 specimens
Rodentia - Acaremyidae	Galileomys eurygnathus⁴ Galileomys eurygnathus⁴ Kramarz 2004 caviomorph 2 specimens
Rodentia - Echimyidae	Prostichomys bowni⁴ Prostichomys bowni⁴ Kramarz 2001 spiny rat 24 specimens
Rodentia -	Stichomys sp.⁴, Spaniomys modestus⁴ Stichomys sp.⁴ Ameghino 1887 caviomorph 1 specimen Spaniomys modestus⁴ Ameghino 1887 caviomorph 2 specimens
Panameriungulata - Proterotheriidae	Tetramerorhinus prosistens⁷, Tetramerorhinus fleaglei⁷, Picturotherium migueli n. gen. n. sp.⁷ Tetramerorhinus prosistens⁷ Ameghino 1899 placental 2 specimens Tetramerorhinus fleaglei⁷ Kramarz and Bond 2005 placental 4 specimens Picturotherium migueli n. gen. n. sp.⁷ Kramarz and Bond 2005 placental holotype plus 1 specimen
Paucituberculata - Palaeothentidae	Palaeothentes minutus¹, Acdestis oweni¹ Palaeothentes minutus¹ Ameghino 1887 marsupial MACN SC numbers 734, 735 Acdestis oweni¹ Ameghino 1887 marsupial MACN SC numbers 3189, 3190

¹Bown and Fleagle 1993; ²Brandoni et al. 2016; ³Kramarz 2002; ⁴Kramarz 2004; ⁵Kramarz 2006; ⁶Kramarz 2006; ⁷Kramarz and Bond 2005; ⁸Meldrum 1990; ⁹Novo et al. 2021