PBDB Collection

Estancia Ré (Neogene of Argentina)

Where: La Pampa, Argentina (35.9° S, 64.9° W: paleocoordinates 36.1° S, 62.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Cerro Azul Formation, Huayquerian (8.0 - 5.0 Ma)

• Romano et al. 2023: Biochronological methods were useful in ordering and estimating the age of the different faunas of the Cerro Azul Formation, ranging from ca. 8 to ca. 5.7 Ma. Some appear to be transitional between Chasicoan and “Huayquerian” faunas (Cerro La Bota, Cerro Patagua, and Algarrobo del Águila), and other three (Barrancas Coloradas, El Guanaco, and Caleufú) cover the latest Miocene, even some of them could have reached the earliest Pliocene. The Cerro Azul Formation localities cover the range between ca. 8 to ca. 5.7 Ma (late Tortonian–Messinian; Late Miocene; Fig. 3; Supplementary Online Information 1, Tab. S8). 7.175 Ma (6.767 - 7.635 Ma) for Estancia Ré.

• formation-level stratigraphic resolution

Environment/lithology: loess; concretionary, brown, gray, sandy siltstone

• Schmidt et al. 2018: Deposits at Telen, Bajo Giuliani, El Guanaco and Caleufú were interpreted as loess-like deposits with immature palaeosols and little diagenetic alteration (Montalvo et al., 2008, 2016; Verzi et al., 2008).

• sandy siltstones diffusely stratified 0.8 to 1.0 m thick, cemented by carbonates, and with abundant

•scattered calcareous concretions and rounded manganese nodules

•Verzi et al. 2003: El afloramiento de la Formación Cerro Azul en Caleufú (figura 1.A) está constituido por limolitas loessoides cementadas por carbonatos, en las cuales se pueden diferenciar tres niveles (figura 1.B). El nivel inferior (portador de los fósiles) y el superior, tienen una potencia de 80 y 50 cm, respectivamente; son de color pardo anaranjado grisáceo, presentan abundantes concreciones calcáreas dispersas y generalmente amorfas. El nivel medio, de 50 cm de espesor, es más arcilloso y de color pardo anaranjado pálido; presenta cutanes de hábito cúbico y concreciones calcáreas cilíndricas, alargadas verticalmente. Estas últimas son interpretadas como rizolitos.

Size classes: macrofossils, mesofossils

Primary reference: E. Cerdeño, C. I. Montalvo, and R. Sostillo. 2017. Deciduous dentition and eruption pattern in late Miocene Pachyrukhinae (Hegetotheriidae, Notoungulata) from La Pampa Province, Argentina. Historical Biology 29(3):359-375 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 204598: authorized by Philip Mannion, entered by Miranta Kouvari on 13.09.2019, edited by Philip Mannion and Kateryn Pino

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Mammalia -	Mammalia indet.³ Mammalia indet.³ mammal
Placentalia -	Rodentia indet.³ Rodentia indet.³ Bowdich 1821 rodent
Rodentia - Caviidae	Caviidae indet.³, Palaeocavia sp.³ Caviidae indet.³ Gray 1821 caviomorph Palaeocavia sp.³ Ameghino 1889 caviomorph
Rodentia - Chinchillidae	Lagostomus pretrichodactyla², Lagostomus (Lagostomopsis) sp.³, Lagostomus telenkechanum² Lagostomus pretrichodactyla² Rovereto 1914 viscacha GHUNLPam 6444, GHUNLPam 6445, GHUNLPam 9709, GHUNLPam 9711, GHUNLPam 14250, GHUNLPam 18968, GHUNLPam 21778. Lagostomus (Lagostomopsis) sp.³ Kraglievich 1926 viscacha Lagostomus telenkechanum² Rasia and Candela 2017 viscacha GHUNLPam 4265, GHUNLPam 4266, GHUNLPam 4267, GHUNLPam 4268, GHUNLPam 6443, GHUNLPam 6446, GHUNLPam 14248, GHUNLPam 14252/3, GHUNLPam 14252/4 GHUNLPam 14248, GHUNLPam 14249, GHUNLPam 22596, GHUNLPam 22597, GHUNLPam 22598, GHUNLPam 22599.
Rodentia -	Octodontoidea indet.³ Octodontoidea indet.³ Waterhouse 1839 caviomorph
Rodentia - Abrocomidae	Abrocoma antiqua³ Abrocoma antiqua³ Rovereto 1914 chinchilla rat
Rodentia - Echimyidae	Reigechimys octodontiformis³, Pampamys emmonsae³ Reigechimys octodontiformis³ Verzi et al. 1994 spiny rat Pampamys emmonsae³ Verzi et al. 1995 spiny rat
Rodentia -	Neophanomys sp.³ Neophanomys sp.³ Rovereto 1914 caviomorph
Rodentia - Octodontidae	Phtoramys sp.³ Phtoramys sp.³ Ameghino 1887 caviomorph
Notoungulata - Toxodontidae	Stenotephanos plicidens⁴ Stenotephanos plicidens⁴ Ameghino 1885 notoungulate
Notoungulata - Hegetotheriidae	Paedotherium sp., Paedotherium minor³, Tremacyllus sp., Tremacyllus impressus⁵, Hemihegetotherium torresi⁶ Paedotherium sp. Burmeister 1888 notoungulate Paedotherium minor³ Cabrera 1937 notoungulate Tremacyllus sp. Ameghino 1891 notoungulate and 70728 Tremacyllus impressus⁵ Ameghino 1888 notoungulate GHUNLPam multiple specimens Hemihegetotherium torresi⁶ Cabrera and Kraglievich 1931 notoungulate GHUNLPam 4275
Notoungulata - Mesotheriidae	Pseudotypotherium subinsigne⁶ Pseudotypotherium subinsigne⁶ Rovereto 1914 notoungulate GHUNLPam 9734, 9743
- Mylodontidae	Proscelidodon gracillimus¹ Proscelidodon gracillimus¹ Rovereto 1914 edentate GHUNLPam 9738 and 9739
Cingulata - Dasypodidae	Doellotatus inornatus⁷, Chasicotatus ameghinoi⁷, Euphractini indet.⁷, Chorobates villosissimus⁷, Macroeuphractus morenoi⁷ Doellotatus inornatus⁷ Rovereto 1914 armadillo Chasicotatus ameghinoi⁷ Scillato-Yané 1977 armadillo Euphractini indet.⁷ Winge 1923 armadillo Euphractini incertae sedis Chorobates villosissimus⁷ Reig 1958 armadillo Macroeuphractus morenoi⁷ Lydekker 1894 armadillo
Didelphimorphia - Didelphidae	Didelphidae indet.³, Thylatheridium sp.³, Thylamys zetti³ Didelphidae indet.³ opossum Thylatheridium sp.³ Reig 1952 opossum Thylamys zetti³ fat-tailed mouse opossum

¹Montalvo et al. 2020; ²Montalvo et al. 2023; ³Montalvo et al. 2016; ⁴Romano et al. 2023; ⁵Sostillo et al. 2018; ⁶Sostillo et al. 2021; ⁷Urrutia et al. 2008