PBDB Collection

Bajo Giuliani (Neogene of Argentina)

Where: La Pampa, Argentina (36.7° S, 64.3° W)

• Paleocoordinates: 36.4° S, 62.6° W (Wright 2013)

• coordinate estimated from map

• local area-level geographic resolution

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

• Schmidt et al. 2018: Figure 2 illustrates the stratigraphic distribution of the locality giving a general age estimate of 6.0-6.6Ma

•

•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). 7.071 Ma (6.811 - 7.541 Ma) for Bajo Giuliani.

• formation-level stratigraphic resolution

Environment/lithology: loess; paleosol/pedogenic, concretionary, nodular, 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).

• Sostillo et al 2018: The Cerro Azul Formation deposits (Linares et al., 1980) are discontinuous along the whole occupied area in the provinces of La Pampa and Buenos Aires (Fig. 2). They are composed of silts, sandy silts and very thin silty sands, reddish and brown colored, with a homogeneous and com- pact general aspect, and frequent carbonate nodules and evidences of pedogenic processes (Folguera and Zárate, 2009). Visconti et al. (2010) interpreted them as eolian de- posits characterized by loessic materials, with a high per- centage of lithic fragments and volcaniclastic sediments. Detailed geological and stratigraphic descriptions of the Cerro Azul Formation are provided by Linares et al. (1980), Goin et al. (2000), Visconti et al. (2010), and Folguera and Zárate (2009)

•Bajo Giuliani are eolian depositions with paleosols.

Size class: macrofossils

Collection methods: Departamento de Ciencias Naturales, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa

•

•Esteban, et al. 2000: Todos los ejemplares analizados están depositados en

•la Cátedra de Geología Histórica de la Facultad de Ciencias Exactas y Naturales de la Universidad Nacional ele La Pampa, Argentina, cuyo acrónimo es GHUNLPam

Primary reference: C. I. Montalvo and S. Casadio. 1988. Presencia del género Paleoctodon (Rodentia, Octodontidae) en el Huayqueriense (Mioceno tardío) de la Provincia de La Pampa. Ameghiniana 25(2):111-114 [C. Jaramillo/J. Carrillo]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140925: authorized by Carlos Jaramillo, entered by Juan Carrillo on 19.03.2013, edited by Grace Varnham, Miranta Kouvari, Philip Mannion and Kateryn Pino

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names

Mammalia
Didelphimorphia - Didelphidae	Zygolestes tatei n. sp.⁵, Thylamys pinei n. sp.⁵, Thylatheridium hudsoni⁵ Zygolestes tatei n. sp.⁵ Goin et al. 2000 opossum Thylamys pinei n. sp.⁵ Goin et al. 2000 fat-tailed mouse opossum Thylatheridium hudsoni⁵ Goin and Montalvo 1988 opossum
Paucituberculata - Caenolestidae	Pliolestes venetus n. sp.⁵ Pliolestes venetus n. sp.⁵ Goin et al. 2000 marsupial
Polydolopimorphia - Argyrolagidae	"Microtragulus rusconii n. sp." = Argyrolagus rusconii⁵ "Microtragulus rusconii n. sp." = Argyrolagus rusconii⁵ Goin et al. 2000 metatherian
Notoungulata - Hegetotheriidae	Tremacyllus impressus¹¹, Paedotherium sp.³, Paedotherium minor¹², Hemihegetotherium achataleptum² Tremacyllus impressus¹¹ Ameghino 1888 notoungulate GHUNLPam multiple specimens Paedotherium sp.³ Burmeister 1888 notoungulate Paedotherium minor¹² Cabrera 1937 notoungulate GHUNLPam 9749, 4318, multiple specimens Hemihegetotherium achataleptum² Rovereto 1914 notoungulate GhUNLPam 2231
Notoungulata - Mesotheriidae	Pseudotypotherium sp.⁹ Pseudotypotherium sp.⁹ Ameghino 1904 notoungulate
Cingulata -	Eosclerocalyptus sp.⁹, Aspidocalyptus castroi⁹, Coscinocercus sp.⁹ Eosclerocalyptus sp.⁹ Ameghino 1919 edentate Aspidocalyptus castroi⁹ Cabrera 1939 edentate Coscinocercus sp.⁹ Cabrera 1939 edentate
Cingulata - Dasypodidae	Chasicotatus ameghinoi⁴ Chasicotatus ameghinoi⁴ Scillato-Yané 1977 armadillo
- Mylodontidae	Proscelidodon gracillimus⁶ Proscelidodon gracillimus⁶ Rovereto 1914 edentate GHUNLPam 2418 and MLP 81-XI-1-1
Panameriungulata - Proterotheriidae	Proterotheriidae indet.¹⁰, Diplasiotherium pampa¹⁰, Neobrachytherium sp.¹⁰ Proterotheriidae indet.¹⁰ Ameghino 1887 placental Diplasiotherium pampa¹⁰ Soria 2001 placental Neobrachytherium sp.¹⁰ Soria 2001 placental
Rodentia - Chinchillidae	Lagostomus pretrichodactyla⁷, Lagostomus telenkechanum⁷ Lagostomus pretrichodactyla⁷ Rovereto 1914 viscacha GHUNLPam 415, GHUNLPam 657, GHUNLPam 2137, GHUNLPam 2192, GHUNLPam 2213, GHUNLPam 2241, GHUNLPam 5123, GHUNLPam 5452, GHUNLPam 8067, GHUNLPam 8071, GHUNLPam 12944, GHUNLPam 18990. Lagostomus telenkechanum⁷ Rasia and Candela 2017 viscacha GHUNLPam 2220, GHUNLPam 2262, GHUNLPam 3694, GHUNLPam 9582, GHUNLPam 12751, GHUNLPam 14584, GHUNLPam 14586.
Rodentia - Abrocomidae	Protabrocoma antiqua⁹ Protabrocoma antiqua⁹ Rovereto 1914 chinchilla rat
Rodentia - Echimyidae	Pampamys emmonsae n. sp.¹⁴ Pampamys emmonsae n. sp.¹⁴ Verzi et al. 1995 spiny rat GHUNLPam 2214 (type)
Rodentia -	Chasichimys sp.¹³ Chasichimys sp.¹³ Pascual 1967 caviomorph GHUNLPam 2217
Rodentia - Octodontidae	Palaeoctodon aff. simplicidens, Metacaremys calfucalel⁸, Phtoramys sp.⁹ Palaeoctodon aff. simplicidens Rovereto 1914 caviomorph Metacaremys calfucalel⁸ Piñero et al. 2021 caviomorph GHUNLPam 2338, 2363, 8547, 27058 Phtoramys sp.⁹ Ameghino 1887 caviomorph
Rodentia - Caviidae	Dolicavia sp.⁹, Palaeocavia sp.⁹ Dolicavia sp.⁹ Ameghino 1916 caviomorph Palaeocavia sp.⁹ Ameghino 1889 caviomorph
Aves
Tinamiformes - Tinamidae	Nothura sp.¹ Nothura sp.¹ Wagler 1827 tinamou GHUNLPam 8070/1, distal portion of left femur

¹Cenizo et al. 2012; ²Cerdeño and Montalvo 2002; ³Cerdeño et al. 2017; ⁴Esteban et al. 2000; ⁵Goin et al. 2000; ⁶Montalvo et al. 2020; ⁷Montalvo et al. 2023; ⁸Piñero et al. 2021; ⁹Romano et al. 2023; ¹⁰Schmidt et al. 2018; ¹¹Sostillo et al. 2018; ¹²Sostillo et al. 2021; ¹³Verzi 1999; ¹⁴Verzi et al. 1995