Laguna Chillhué: Huayquerian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Didelphimorphia
Mammalia - Rodentia - Echimyidae
Reigechimys plesiodon n. sp. Verzi et al. 1994
Verzi et al. 1994
Holotype: GHUNLPam 306
Eumysops sp. Ameghino
Mammalia - Rodentia - Chinchillidae
Montalvo et al. 2023
GHUNLPam 5454 left mandible with i and p4-m2, GHUNLPam 5635 right mandible with p4-m1, GHUNLPam 8418 left mandible with i and p4, GHUNLPam 8559 right mandible with broken m1-3, GHUNLPam 18799 left mandible with p4-m1 and broken m2-m3, GHUNLPam 21734 right mandible with p4-m1.
Montalvo et al. 2023
GHUNLPam 2171 right mandible with p4-m1, GHUNLPam 5634 left mandible with p4-m3, GHUNLPam 5664 left mandible with i and p4-m3, GHUNLPam 5566 left M3, GHUNLPam 8400 right mandible with i and p4-m3, GHUNLPam 8401 right maxilla with M1-3, GHUNLPam
Mammalia - Rodentia - Dinomyidae
Sostillo et al. 2022
GHUNLPam 147
Mammalia - Cingulata - Dasypodidae
Urrutia et al. 2008
Proeuphractus sp. Ameghino 1886
Urrutia et al. 2008
Urrutia et al. 2008
Urrutia et al. 2008
Urrutia et al. 2008
Macrochorobates scalabrinii (Moreno and Mercerat 1891)
Urrutia et al. 2008
see common names

Geography
Country:Argentina State/province:La Pampa County:Guatraché
Coordinates: 37.3° South, 64.2° West (view map)
Paleocoordinates:37.0° South, 62.5° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:local area
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: 7.657 to 7.016 Ma (other)
Stratigraphy
Formation:Cerro Azul
Stratigraphic resolution:formation
Stratigraphy comments: Age: Late Chasicoan or Early Huayquerian? (Late Miocene)
The stratotype is recognized in the lower levels of the Cerro Azul Formation in this locality.

Verzi et al. 1994 & Schmidt et al., 2018: Huayquerian

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). 7.190 Ma (7.016 - 7.657 Ma) for Laguna Chilhué.
Lithology and environment
Primary lithology:massive,red sandy siltstone
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).
Environment:fluvial-lacustrine indet.
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
Metadata
Also known as:Zone of Chasichimys scagliai
Database number:152065
Authorizer:C. Jaramillo, J. Carrillo, P. Mannion Enterer:M. Vallejo, K. Pino, M. Kouvari
Modifier:K. Pino Research group:vertebrate
Created:2013-11-05 09:09:07 Last modified:2025-02-22 15:12:02
Access level:group members Released:2015-11-05 09:09:07
Creative Commons license:CC0
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:

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]
85304 R. Sostillo, M. C. Cardonatto, L. Kerber and C. I. Moltalvo. 2022. Taxonomic and ontogenetic diversity of Dinomyidae (Rodentia) from the late Miocene-early Pliocene of La Pampa province (Argentina) based on cranio-dental remains. Journal of South American Earth Sciences 114:103704 [J. Carrillo/K. Pino/P. Mannion]
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]
73278 D. H. Verzi, M. G. Vucetich, and C. I. Montalvo. 1994. Octodontid-like Echimyidae (Rodentia): an Upper Miocene episode in the radiation of the family. Paleovertebrata 23(1-4):199-210 [P. Mannion/M. Kouvari]