PBDB Collection

Loma de la Lluvia, Pinturas Fm., Lago Buenos Aires (Miocene of Argentina)

Where: Santa Cruz, Argentina (47.0° S, 70.7° W: paleocoordinates 47.8° 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: 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).

•Brandoni et al 2016: in Loma de La Lluvia (47?10 47.0300S, 70? 4307.7200W; Fig. 1a, d), the fossils from the middle sequence that at this locality lies above a tephra level of ca.19.9 Ma, which is not a confident age, and the relationships of this level with others from Pinturas For- mation are still unclear (Perkins et al. 2012; Fleagle et al. 2012).

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 59323: authorized by Darin Croft, entered by Darin Croft on 26.03.2006, edited by Juan Carrillo, Jelle Zijlstra, Miranta Kouvari and Grace Varnham

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

unclassified
-	Schistotherium cf. binum² Schistotherium cf. binum² MPM-PV 17405
Mammalia
Paucituberculata - Palaeothentidae	Palaeothentes minutus¹, Acdestis oweni¹, Acdestis lemairei¹ Palaeothentes minutus¹ Ameghino 1887 marsupial MACN SC numbers 674, 678, 3264, 3276 Acdestis oweni¹ Ameghino 1887 marsupial MACN SC numbers 680, 682, 709, 1161, 1165, 1166, 3262, 3277 Acdestis lemairei¹ Bown and Fleagle 1993 marsupial MACN SC- 685
Panameriungulata - Proterotheriidae	Tetramerorhinus fleaglei⁸, Picturotherium migueli⁸ Tetramerorhinus fleaglei⁸ Kramarz and Bond 2005 placental 4 specimens Picturotherium migueli⁸ Kramarz and Bond 2005 placental 2 specimens
Rodentia - Neoepiblemidae	Perimys intermedius n. sp.⁴ Perimys intermedius n. sp.⁴ Kramarz 2002 caviomorph holotype plus 2 specimens
Rodentia - Dinomyidae	Scleromys quadrangulatus⁷ Scleromys quadrangulatus⁷ Kramarz 2006 caviomorph 2 specimens
Rodentia - Erethizontidae	Branisamyopsis praesigmoides n. sp.⁵ Branisamyopsis praesigmoides n. sp.⁵ Kramarz 2004 porcupine holotype plus 3 specimens
Rodentia -	Eosteiromys cf. homogenidens⁵, Steiromys duplicatus⁵, Steiromys principalis⁵, Neoreomys australis⁷, Luantus propheticus⁶ Eosteiromys cf. homogenidens⁵ Ameghino 1902 caviomorph 2 specimens Steiromys duplicatus⁵ Ameghino 1887 caviomorph 1 specimen Steiromys principalis⁵ Ameghino 1901 caviomorph 1 specimen Neoreomys australis⁷ Ameghino 1887 caviomorph 1 specimen Luantus propheticus⁶ Ameghino 1899 caviomorph 12 specimens
Rodentia - Acaremyidae	Galileomys eurygnathus⁵ Galileomys eurygnathus⁵ Kramarz 2004 caviomorph 1 specimen
Rodentia - Echimyidae	Prostichomys bowni⁵ Prostichomys bowni⁵ Kramarz 2001 spiny rat 22 specimens
Primates - Homunculidae	Soriacebus adrianae³ Soriacebus adrianae³ Fleagle 1990 monkey 3 specimens
Primates -	Carlocebus carmenensis³, ? Carlocebus carmenensis⁹ Carlocebus carmenensis³ Fleagle 1990 monkey 2 specimens ? Carlocebus carmenensis⁹ Fleagle 1990 monkey MPM-PV 17398, M3

¹Bown and Fleagle 1993; ²Brandoni et al. 2016; ³Fleagle 1990; ⁴Kramarz 2002; ⁵Kramarz 2004; ⁶Kramarz 2006; ⁷Kramarz 2006; ⁸Kramarz and Bond 2005; ⁹Novo and Fleagle 2015