PBDB Collection

El Guanaco (Miocene of Argentina)

Where: La Pampa, Argentina (37.7° S, 63.5° W: paleocoordinates 37.9° S, 61.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Cerro Azul Formation, Messinian (7.2 - 5.3 Ma)

• Schmidt et al. 2018: Figure 2 illustrates the stratigraphic distribution of the locality giving a general age estimate of 5.4-6.1Ma

•

•Prevosti 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.

• formation-level stratigraphic resolution

Environment/lithology: loess; lithified, brown siltstone

• 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).

Size class: macrofossils

Reposited in the MLP

Primary reference: F. J. Goin and C. Montalvo. 1988. Revisión sistemática y reconocimiento de una nueva especie del género Thylatheridium Reig (Marsupialia, Didelphidae). Ameghiniana 25(2):161-167 [C. Jaramillo/J. Carrillo]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140932: authorized by Carlos Jaramillo, entered by Juan Carrillo on 19.03.2013, edited by Kateryn Pino, Grace Varnham and Miranta Kouvari

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Notoungulata - Hegetotheriidae	Paedotherium minor⁶ Paedotherium minor⁶ Cabrera 1937 notoungulate
Cingulata - Dasypodidae	Macrochorobates chapadmalensis⁷, Chorobates villosissimus⁷, Chorobates cf. villosissimus⁷, Doellotatus inornatus⁷, Chasicotatus ameghinoi⁷ Macrochorobates chapadmalensis⁷ Ameghino 1908 armadillo Chorobates villosissimus⁷ Reig 1958 armadillo Chorobates cf. villosissimus⁷ Reig 1958 armadillo Doellotatus inornatus⁷ Rovereto 1914 armadillo Chasicotatus ameghinoi⁷ Scillato-Yané 1977 armadillo
Panameriungulata - Proterotheriidae	Eoauchenia primitiva⁵ Eoauchenia primitiva⁵ Ameghino 1887 placental
Rodentia - Cricetidae	Sigmodontinae indet.⁴ Sigmodontinae indet.⁴ Wagner 1843 rodent
Rodentia - Ctenomyidae	Xenodontomys simpsoni⁸ Xenodontomys simpsoni⁸ Kraglievich 1961 caviomorph GHUNLPam 342 (see also ref 65013)
Rodentia - Chinchillidae	Lagostomus pretrichodactyla³, Lagostomus telenkechanum³ Lagostomus pretrichodactyla³ Rovereto 1914 viscacha GHUNLPam 12958 right mandible with p4-m3, GHUNLPam 14854 palate with left P4-M2 and right M1-3. Lagostomus telenkechanum³ Rasia and Candela 2017 viscacha GHUNLPam 131 right mandible with i and p4-3, left with m3, and isolated I, GHUNLPam 22657 palate with left P4-M3 and right broken P4-M2.
Sparassodonta - Thylacosmilidae	"Thylacosmilus atrox" = Thylacosmilus atrox⁴, "Achlysictis cf. lelongi" = Thylacosmilus atrox² "Thylacosmilus atrox" = Thylacosmilus atrox⁴ Riggs 1933 metatherian "Achlysictis cf. lelongi" = Thylacosmilus atrox² Riggs 1933 metatherian
Polydolopimorphia - Argyrolagidae	"Microtragulus rusconii" = Argyrolagus rusconii² "Microtragulus rusconii" = Argyrolagus rusconii² Goin et al. 2000 metatherian
Didelphimorphia - Didelphidae	Thylatheridium dolgopolae, Hesperocynus dogolpolae⁴, Hyperdidelphys pattersoni² Thylatheridium dolgopolae Reig 1952 opossum Hesperocynus dogolpolae⁴ opossum Hyperdidelphys pattersoni² Reig 1952 opossum
Aves
Tinamiformes - Tinamidae	Nothura sp.¹ Nothura sp.¹ Wagler 1827 tinamou GHUNLPam 14861/1, distal portion of left tibiotarsus

¹Cenizo et al. 2012; ²Goin et al. 2000; ³Montalvo et al. 2023; ⁴Romano et al. 2023; ⁵Schmidt et al. 2018; ⁶Sostillo et al. 2021; ⁷Urrutia et al. 2008; ⁸Verzi et al. 1991