Cerro La Bota: Huayquerian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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"Cnemidophorine" indet.
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Montalvo et al. 2019 | |||||||||
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Gliptodontidae indet.
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Montalvo et al. 2023 | |||||||||
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Reptilia
- Colubridae
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"Colubridae" indet.
Oppel 1811
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Montalvo et al. 2019 | |||||||||
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Mammalia
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Mammalia indet.
Linnaeus 1758
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Montalvo et al. 2023 | |||||||||
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Metatheria indet.
(Huxley 1880)
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Didelphimorphia
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Didelphimorphia indet.
Gill 1872
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Montalvo et al. 2023 | |||||||||
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Mammalia
- Panameriungulata
- Proterotheriidae
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Proterotheriidae indet.
Ameghino 1887
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Schmidt et al. 2018 | |||||||||
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Proterotheriinae indet.
Ameghino 1885
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Schmidt et al. 2022 | |||||||||
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Mammalia
- Rodentia
- Chinchillidae
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Lagostomus sp.
Brookes 1828
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Montalvo et al. 2019 | |||||||||
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Lagostomus telenkechanum
Rasia and Candela 2017
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Montalvo et al. 2023 | |||||||||
| GHUNLPam 5986 left mandible with i and p4-m3 | ||||||||||
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Mammalia
- Rodentia
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Octodontoidea indet.
Waterhouse 1839
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Montalvo et al. 2019 | |||||||||
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Octodontoidea informal indet. 1
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Montalvo et al. 2019 | |||||||||
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Octodontoidea informal indet. 2
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Rodentia
- Octodontidae
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Octodontidae indet.
Waterhouse 1839
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Montalvo et al. 2023 | |||||||||
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Metacaremys primitiva
Piñero et al. 2021
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Montalvo et al. 2023 | |||||||||
| GHUNLPam 5969, 6922, 6925, 6926, 6927, 6928, 6929, 21984, 21986, 21987, 21989 | ||||||||||
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Cercomys primitiva
Pascual 1967
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Rodentia
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cf. Chasichimys indet.
Pascual 1967
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Montalvo et al. 2019 | |||||||||
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cf. Chasichimys sp.
Pascual 1967
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Montalvo et al. 2023 | |||||||||
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Chasichimys bonaerense
Pascual 1967
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Mammalia
- Rodentia
- Echimyidae
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"Cercomys" sp.
Cuvier 1829
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Rodentia
- Caviidae
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Caviidae indet.
Gray 1821
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Montalvo et al. 2019 | |||||||||
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cf. Orthomyctera indet.
Ameghino 1889
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Montalvo et al. 2019 | |||||||||
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cf. Orthomyctera sp.
Ameghino 1889
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Montalvo et al. 2023 | |||||||||
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cf. Procardiomys indet.
Pascual 1961
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Montalvo et al. 2019 | |||||||||
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cf. Procardiomys sp.
Pascual 1961
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Montalvo et al. 2023 | |||||||||
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Mammalia
- Rodentia
- Dinomyidae
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Dinomyidae indet.
Peters 1873
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Montalvo et al. 2019 | |||||||||
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Tetrastylus sp.
Ameghino 1886
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Notoungulata
- Toxodontidae
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Toxodontidae indet.
Scott 1873
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Montalvo et al. 2019 | |||||||||
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Hemixotodon chasicoensis
Cabrera and Kraglievich 1931
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Notoungulata
- Mesotheriidae
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Typotheriopsis chasicoensis
Cabrera and Kraglievich 1931
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Notoungulata
- Interatheriidae
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Protypotherium minutum
Cabrera and Kraglievich 1931
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Notoungulata
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Hemihegetotherium torresi
Cabrera and Kraglievich 1931
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Montalvo et al. 2019 | |||||||||
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Hemihegetotherium achataleptum
Rovereto 1914
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Cerdeño and Montalvo 2002 | |||||||||
| GHUNLPam 351, GHUNLPam 5303, GHUNLPam 5307, GHUNLPam 5307, GHUNLPam 6983, GHUNLPam 21975 | ||||||||||
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= Hemihegetotherium torresi
Cabrera and Kraglievich 1931
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Sostillo et al. 2021 | |||||||||
| GHUNLPam 351, GHUNLPam 5303, GHUNLPam 5307, GHUNLPam 5307, GHUNLPam 8446, GHUNLPam 6983, GHUNLPam 21975 | ||||||||||
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Paedotherium minor
Cabrera 1937
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Montalvo et al. 2019 | |||||||||
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Tremacyllus impressus
(Ameghino 1888)
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Cingulata
- Dasypodidae
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Dasypodidae indet.
(Gray 1821)
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Montalvo et al. 2019 | |||||||||
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Eutatini indet.
(Bordas 1933)
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Montalvo et al. 2019 | |||||||||
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Chasicotatus ameghinoi
Scillato-Yané 1977
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Doellotatus inornatus
(Rovereto 1914)
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Montalvo et al. 2019 | |||||||||
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Euphractini indet.
Winge 1923
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Montalvo et al. 2019 | |||||||||
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Zaedyus pichiy
Desmarest 1804
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Esteban et al. 2000 | |||||||||
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Chorobates villosissimus
Reig 1958
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Montalvo et al. 2019 | |||||||||
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Proeuphractus sp.
Ameghino 1886
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Montalvo et al. 2019 | |||||||||
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Proeuphractus limpidus
Ameghino 1886
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Montalvo et al. 2019 | |||||||||
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Vetelia perforata
Scillato-Yané 1977
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Montalvo et al. 2019 | |||||||||
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Macrochorobates scalabrinii
(Moreno and Mercerat 1891)
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Mammalia
- Cingulata
- Chlamyphoridae
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Chlamyphorinae indet.
Bonaparte 1850
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Montalvo et al. 2023 | |||||||||
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Mammalia
- Cingulata
- Glyptodontidae
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Glyptodontidae indet.
(Burmeister 1879)
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Montalvo et al. 2019 | |||||||||
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Glyptodontinae indet.
Gray 1869
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Cingulata
- Pampatheriidae
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Kraglievichia sp.
Castellanos 1927
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Montalvo et al. 2019 | |||||||||
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Mammalia
- Megatheriidae
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? Anisodontherium indet.
Brandoni and De Iuliis 2007
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Montalvo et al. 2019 | |||||||||
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? Anisodontherium sp.
Brandoni and De Iuliis 2007
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Montalvo et al. 2023 | |||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | La Pampa | County: | Utracán |
| Coordinates: | 37.4° South, 65.5° West (view map) | ||||
| Paleocoordinates: | 37.6° South, 63.2° West | ||||
| Basis of coordinate: | stated in text | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene |
| 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Huayquerian |
| Age range of interval: | 7.9 - 4.9 m.y. ago |
| Age estimate: | 7.944 to 7.332 Ma (other) |
Stratigraphy
| Formation: | Cerro Azul | ||||
| Stratigraphy comments: Early late Miocene
The stratotype is the lower level of the Cerro Azul Formation outcropping at this locality Montalvo et al. 2019: The revision of the vertebrate assemblage from this locality, as well as new geomorphologic and sedimentological interpretations of the Cerro Azul Formation in the area, confirms the previous assignation to the Chasicoan age. Prevosti et al. 2023: Between 9 and ca. 7.7 Ma, there is a transitional fauna, represented by the assemblages retrieved from Cerro Patagua, Cerro La Bota, and Algarrobo del Águila, with taxa already recorded in the Chasicoan fauna and the appearance of four taxa ca. 8 Ma that reach at least 7.3 Ma. These are “Orthomyctera”, Proeuphractus limpidus, Macrochorobates scalabrinii, and Tetrastylus laevigatus, possibly representing the first instances of the beginning of the “Huayquerian” fauna. We did not consider Cerro La Bota as part of the Chasicoan fauna but as representative of a transition between the Chasicoan fauna and the “Huayquerian” fauna, together with Cerro Patagua and Algarrobo del Águila (cf. Contreras et al., 2013). |
Lithology and environment
| Primary lithology: | massive,very fine,red lithified sandy siltstone |
| Secondary lithology: | current ripples,"cross stratification",medium lithified sandy conglomerate |
| Includes fossils? | Y |
| Lithology description: The Cerro Azul formation is composed of massive brown reddish sandy silts, with loessic erosion. A detailed description of the geology and stratigraphy of this formation can be seen in Linares et al. (1980) and Goin et al. (2000). Montalvo et al. 2019: The FA1 crops out in the lower part of the studied section and is 1.7 m thick (Fig. 2). It includes sheet-like strata with non-erosive bases, composed of massive and commonly very fine-grained siltstones (facies Fsm) with root traces (facies P).The FA2 is 2.2 m thick and overlays FA1 deposits with erosive contact (Fig. 2). It is constituted by a lateral and vertical erosive superposition of sandstone (facies St) and conglomeratic (facies Gt) bodies. | |
| Environment: | fluvial indet. |
| Geology comments: Montalvo et al. 2019: Sedimentological and stratigraphic descriptions of the Cerro Azul Formation at Cerro La Bota locality were originally performed by Goin et al. (2000). These authors interpreted that the levels cropping out in this site represent ephemeral fluvial deposits. We propose here a new interpretation (Fig. 2) by recognizing two facies associations: loess-palaeosol association (FA1) and fluvial deposits association (FA2).
The amalgamated conglomeradic–sandy bodies suggest the episodic development of perennial streams without flow division on a loessic substrate. Schmidt et al. 2018: Levels of Cerro Azul formation at Cerro La Bota represent an ephemeral fluvial event (Goin et al. 2000; Verzi et al. 2008). | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
| Preservation of anatomical detail: | good |
| Fragmentation: | frequent |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Montalvo et al. 2019: specimens recovered belong to the Paleontological Collection of the Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa (La Pampa Province, Argentina).
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 | |
Metadata
| Also known as: | Zone of Chasichimys bonaerense | ||
| Database number: | 152063 | ||
| Authorizer: | C. Jaramillo, J. Carrillo, P. Mannion | Enterer: | M. Vallejo, K. Pino, M. Kouvari, G. Varnham |
| Modifier: | K. Pino | Research group: | vertebrate |
| Created: | 2013-11-05 08:38:41 | Last modified: | 2023-08-15 03:20:24 |
| Access level: | group members | Released: | 2015-11-05 08:38:41 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 48750. | D. H. Verzi, C. I. Montalvo, and C. M. Deschamps. 2008. Biostratigraphy and biochronology of the Late Miocene of central Argentina: Evidence from rodents and taphonomy. Geobios 41:145-155 [C. Jaramillo/M. Vallejo] |
Secondary references:
| 73117 | E. Cerdeño and C. I. Montalvo. 2002. Los Hegetotheriinae (Hegetotheriidae, Notoungulata) del Mioceno superior de la provincia de La Pampa, Argentina. Revista del Museo Argentina de Ciencias Naturales 41(1):35-43 [P. Mannion/G. Varnham] | |
| 70059 | G. I. Esteban, N. L. Nasif, and C. I. Montalvo. 2000. Nuevos registros de Dasypodidae (Xenarthra) del Mioceno tardío de la provincia de La Pampa, Argentina. Revista Espanola de Paleontología 16(1):77-87 [P. Mannion/M. Kouvari] | |
| 85601 | C. I. Montalvo, R. Sostillo, and L. L. Rasia. 2023. New light on the late Middle Miocene–Early Pliocene representatives of Lagostomus (Chinchillidae, Rodentia) from Cerro Azul Formation, Argentina. Journal of South American Earth Sciences 128(104481) [J. Carrillo/K. Pino] | |
| 69136 | C. I. Montalvo, R. L. Tomassini, R. Sostillo, E. Cerdeño, D.H. Verzi, G. Visconti, A. Folguera and G.I. Schmidt. 2019. A chasicoan (late miocene) vertebrate assemblage from cerro azul formation, central Argentina. Geomorphological and biochronological considerations. Journal of South American Earth Sciences [P. Mannion/G. Varnham/G. Varnham] | |
| 81656 | C. I. Montalvo, R. L. Tomassini, E. Cerdeño and F. J. Fernández. 2023. A Late Miocene mammal assemblage reveals a complex taphonomic history in fluvial deposits of central Argentina. Historical Biology 35(5):645-660 [P. Mannion/G. Varnham/P. Mannion] | |
| 69166 | G. I. Schmidt, C. I. Montalvo, R. Sostillo and E. Cerdeño. 2018. Proterotheriidae (Mammalia, Litopterna) from the Cerro Azul Formation (late Miocene), La Pampa Province, Argentina. Journal of South American Earth Sciences 83:165-177 [P. Mannion/G. Varnham] | |
| 86911 | G. I. Schmidt, C. I. Montalvo, E. Cerdeño, R. Sostillo, R. L. Tomassini and R. A. Bonini. 2022. Updated data on Litopterna from the Huayquerian Stage/Age (Late Miocene-Early Pliocene) of central-east Argentina. Comptes Rendus Palevol 21(32):721-743 [P. Mannion/G. Varnham/P. Mannion] | |
| 84590 | R. Sostillo, C. I. Montalvo, E. Cerdeño, G. I. Schmidt, A. Folguera and M. C. Cardonatto. 2021. Updated knowledge on the Notoungulata (Mammalia) from the late Miocene Cerro Azul Formation, La Pampa Province, Argentina. Historical Biology An International Journal of Paleobiology 33(8):1247-1265 [J. Carrillo/K. Pino] | |
| 70799 | J. J. Urrutia, C. I. Montalvo, and G. J. Scillato-Yane. 2008. Dasypodidae (Xenarthra, Cingulata) de la Formación Cerro Azul (Mioceno tardío) de la provincia de La Pampa, Argentina. Ameghiniana 45(2):289-302 [P. Mannion/M. Kouvari] |