A Chasicoan (late Miocene) vertebrate assemblage from Cerro Azul Formation, central Argentina. Geomorphological and biochronological considerations

Montalvo, Claudia I.; Tomassini, Rodrigo Leandro; Sostillo, Renata; Cerdeño, Esperanza; Verzi, Diego H.; Visconti, Graciela; Folguera, Alicia; Schmidt, Gabriela I.

doi:10.1016/j.jsames.2019.102218

Cited by 34 publications

(22 citation statements)

References 38 publications

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“…The second group paired up faunas having similar estimated ages and faunal overlaps, including MH + QSUp, CACal + QSLo, CAHLo + CAHUp, and Chas + CAChas. This last analysis explores the possibility that several of the Cerro Azul assemblages belong to the same fauna based on literature sources 21 , 22 , 114 . To control the presence/absence of taxa in different faunas, we performed subsampling analyses using Classical Rarefaction Analysis 115 , with subsampling set at 40% and 1000 iterations using the R package divDyn 113 .…”

Section: Methodsmentioning

confidence: 99%

“…Mammalian taxonomic composition and trophic structure (in terms of diet and body size) through time were explored using the multinomial likelihood statistic 114 . The following taxonomic groups were analyzed: Sparassodonta, Marsupialia, Cingulata, Pilosa, Notoungulata, Litopterna, Caviomorpha, Cricetidae, Perissodactyla, Artiodactyla, and Carnivora.…”

Section: Methodsmentioning

confidence: 99%

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New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

Prevosti

Romano

Forasiepi

et al. 2021

Sci Rep

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The vertebrate fossil record of the Pampean Region of Argentina occupies an important place in South American vertebrate paleontology. An abundance of localities has long been the main basis for constructing the chronostratigraphical/geochronological scale for the late Neogene–Quaternary of South America, as well as for understanding major patterns of vertebrate evolution, including the Great American Biotic Interchange. However, few independently-derived dates are available for constraining this record. In this contribution, we present new 40Ar/39Ar dates on escorias (likely the product of meteoric impacts) from the Argentinean Atlantic coast and statistically-based biochronological analyses that help to calibrate Late Miocene–Pliocene Pampean faunal successions. For the type areas of the Montehermosan and Chapadmalalan Ages/Stages, our results delimit their age ranges to 4.7–3.7 Ma and ca. 3.74–3.04 Ma, respectively. Additionally, from Buenos Aires Province, dates of 5.17 Ma and 4.33 Ma were recovered for “Huayquerian” and Montehermosan faunas. This information helps to better calibrate important first appearances of allochthonous taxa in South America, including one of the oldest records for procyonids (7.24–5.95 Ma), cricetids (6.95–5.46 Ma), and tayassuids (> 3.74 Ma, oldest high-confidence record). These results also constrain to ca. 3 Ma the last appearances of the autochthonous sparassodonts, as well as terror birds of large/middle body size in South America. South American faunal turnover during the late Neogene, including Late Pliocene extinctions, is interpreted as a consequence of knock-on effects from global climatic changes and initiation of the icehouse climate regime.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

Prevosti

Romano

Forasiepi

et al. 2021

Sci Rep

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“…Macrochorobates scalabrinii is a medium-to large-sized Euphractini (Euphractinae) armadillo known from several Late Miocene deposits over a wide latitudinal range in Argentina. In the Pampean Region, it is known from the Cerro Azul Formation of La Pampa Province (see Esteban et al 2001;Urrutia et al 2008;Montalvo et al 2019), and the "Epecuén Formation" (see Scillato-Yané 1980, 1982 of Buenos Aires Province. In this respect, Goin et al (2000) considered that the latter should be included within the Cerro Azul Formation since there are no significant lithostratigraphic or faunistic differences.…”

Section: Discussionmentioning

confidence: 99%

Late Miocene Dasypodidae Gray, 1821(Xenarthra, Cingulata) from the Toro Negro Formation (Central Andes, Argentina): diversity and chronological and biogeographical implications

Brandoni¹,

Barasoain²,

Ruiz³

2023

Comptes Rendus Palevol

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Fossil remains herein described are referred to different species of Dasypodidae Gray, 1821 (Mammalia, Xenarthra, Cingulata) and come from the upper levels of the lower member (Late Miocene-Early Pliocene) of the Toro Negro Formation at Quebrada de Las Torrecillas, La Rioja Province, Argentina, where previous vertebrate records only include those of Pyramiodontherium scillatoyanei De Iuliis, Ré & Vizcaíno, 2004 (Mammalia, Xenarthra) and Opisthodactylus cf. kirchneri Noriega, Jordan, Vezzosi & Areta, 2017 (Aves, Rheidae). The remains of Dasypodidae herein presented include Vetelia ghandii Esteban & Nasif, 1996, Chasicotatus peiranoi Esteban & Nasif, 1996, Macrochorobates scalabrinii (Moreno & Mercerat, 1891), Prozaedyus sp., and Paleuphractus argentinus (Moreno & Mercerat, 1891), and constitute the first records of these species for the Toro Negro Formation, increasing the mammal diversity for this unit. The association of dasypodids here described shows strong affinities with those described for Late Miocene localities of Northwestern Argentina. Under these evidences, the Dasypodidae here reported for Quebrada de Las Torrecillas site show a characteristic association of taxa from Northwestern Argentina, suggesting a Messinian age (Late Miocene) for the bearing levels of the Toro Negro Formation. In this way, these records support the accurate ages recently proposed for the lower Member of the Toro Negro Formation (i.e., Late Miocene-Early Pliocene).

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“…Folguera and Zárate (2009) proposed that different Late Miocene units cropping out in the southwestern Buenos Aires Province, including Arroyo Chasicó, Epecuén, and Saldungaray formations, should be referred to the CAF, which is widely extended in La Pampa Province and was defined on lithostratigraphic criteria (Folguera et al, 2017). This proposal was considered in several recent paleontological works (e.g., Deschamps and Tomassini, 2016;Montalvo et al, 2019;Piñero et al, 2021;Schmidt et al, 2022) and it is also accepted for this study.…”

Section: Geological and Paleontological Setting Of The Chasicó Creek ...mentioning

confidence: 95%

On the validity of the Macrochorobates scalabrinii Biozone (early Huayquerian Stage/Age, Late Miocene). Multi-proxy analysis of the enigmatic Arenas Blancas site (Buenos Aires Province, Argentina)

Tomassini¹,

Montalvo²,

Beilinson³

et al. 2023

andgeo

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Arenas Blancas is a poorly known fossiliferous site located in the lower reach of the Chasicó creek (Buenos Aires Province, Argentina), with great relevance from a biostratigraphic viewpoint. The Macrochorobates scalabrinii Biozone was defined in this site, proposed as the biostratigraphic basis of the early Huayquerian Stage/Age (Late Miocene); however, the geological context and faunal record of this site have never been studied in detail. In this work, we perform a multi-proxy analysis of the Arenas Blancas site, as well as a nearby site here called Curva de la Vaca, and provide new interpretations on their origin, age, and biostratigraphy. Sedimentological, stratigraphic, and geomorphological characteristics of both sites suggest that the sequences include fluvial/alluvial deposits that represent Quaternary terraces. The taxonomic analysis of the Arenas Blancas faunal assemblage evidences the presence of 14 mammal taxa, together with some fishes, reptiles, and birds; the assemblage is correlated with the assemblage from the Cerro Azul Formation assigned to the Chasicoan Stage/Age (Late Miocene), also recovered from the lower reach of the Chasicó creek. The use of the taxa proposed in previous works to characterize the Macrochorobates scalabrinii Biozone (including this species) is not supported due to their taxonomic status and/or temporal distribution. Taphonomic evaluation indicates that the assemblage is constituted by reworked specimens; in this frame, it is proposed that fluvio/alluvial events, occurred during the Late Pleistocene-Holocene, eroded the Upper Miocene substrate and reworked fossil remains. Based on the present evidence, the Macrochorobates scalabrinii Biozone is here rejected as a valid biostratigraphic unit.

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A Chasicoan (late Miocene) vertebrate assemblage from Cerro Azul Formation, central Argentina. Geomorphological and biochronological considerations

Cited by 34 publications

References 38 publications

New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

Late Miocene Dasypodidae Gray, 1821(Xenarthra, Cingulata) from the Toro Negro Formation (Central Andes, Argentina): diversity and chronological and biogeographical implications

On the validity of the Macrochorobates scalabrinii Biozone (early Huayquerian Stage/Age, Late Miocene). Multi-proxy analysis of the enigmatic Arenas Blancas site (Buenos Aires Province, Argentina)

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