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

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