PBDB Collection

Barrancas Coloradas: Messinian, Argentina

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Argyrolagidae

	Microtragulus rusconii Goin et al. 2000
Mammalia - Mylodontidae

	Proscelidodon gracillimus Rovereto 1914	Montalvo et al. 2020
	GHUNLPam 2118
Mammalia - Cingulata - Dasypodidae

	Macrochorobates chapadmalensis Ameghino 1908	Urrutia et al. 2008

	Macroeuphractus morenoi (Lydekker 1894)	Urrutia et al. 2008

	Doellotatus inornatus (Rovereto 1914)	Urrutia et al. 2008

	Chasicotatus ameghinoi Scillato-Yané 1977
Mammalia - Notoungulata - Mesotheriidae

	Pseudotypotherium sp. Ameghino 1904	Romano et al. 2023
Mammalia - Notoungulata

	Tremacyllus impressus (Ameghino 1888)	Sostillo et al. 2018
	GHUNLPam 2054

	Paedotherium sp. Burmeister 1888	Cerdeño et al. 2017

	Paedotherium minor Cabrera 1937	Sostillo et al. 2021
Mammalia - Rodentia - Chinchillidae

	Lagostomus telenkechanum Rasia and Candela 2017	Montalvo et al. 2023
	GHUNLPam 2060 right mandible with p4-m1, GHUNLPam 2061 right maxilla with M2-3.

	Lagostomus pretrichodactyla (Rovereto 1914)	Montalvo et al. 2023
	GHUNLPam 2142 left mandible with p4, GHUNLPam 14609 palate with right P4-M2 and left P4-M1.
Mammalia - Rodentia - Caviidae

	Palaeocavia sp. Ameghino 1889	Romano et al. 2023
Mammalia - Rodentia - Ctenomyidae

	Xenodontomys simpsoni Kraglievich 1961	Verzi et al. 1991
	GHUNLPam 441 y 442. See also ref 65013
Mammalia - Rodentia - Octodontidae

	Phtoramys hidalguense Pascual et al. 1965
Mammalia - Rodentia - Echimyidae

	aff. Clyomys sp. Thomas 1916
	= Clyomys sp. Thomas 1916	Romano et al. 2023
see common names

Country:	Argentina	State/province:	La Pampa	County:	Capital Department
Coordinates:	36.7° South, 64.2° West (view map)
Paleocoordinates:	36.4° South, 62.5° West (Wright 2013)
Basis of coordinate:	stated in text
Geographic resolution:	outcrop

Period:	Neogene	Epoch:	Miocene
Stage:	Messinian	10 m.y. bin:	Cenozoic 6
Key time interval:	Messinian
Age range of interval:	7.246 - 5.333 m.y. ago
Age estimate:	5.325 to 6.380 Ma (graphic correlation)

Primary lithology:	massive,red sandy siltstone
Lithology description: Eolian deposits
Environment:	terrestrial indet.

Modes of preservation:	body
Size of fossils:	macrofossils,mesofossils
Preservation of anatomical detail:	good
Fragmentation:	frequent

Collection methods:	survey of museum collection
Reason for describing collection:	biostratigraphic analysis

Formation:	Cerro Azul
Stratigraphy comments: The stratotype is recognized in the lower levels of the Cerro Azul Formation in this locality This zone is also recognized in the lower levels of the Cerro Azul Formation at El Guanaco (368 170 S–648 160 W 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. La Pampa Province. But the chronomorph of X. simpsoni recorded in El Guanaco is slightly more derived, suggesting that these bearing levels are younger than those outcropping at Barrancas Coloradas (Verzi et al., 2004a, 2004b). 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 deposits 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).

Also known as:	Zone of Xenodontomys simpsoni
Database number:	152067
Authorizer:	C. Jaramillo, J. Carrillo, P. Mannion	Enterer:	M. Vallejo, P. Mannion, J. Carrillo, M. Kouvari, K. Pino
Modifier:	K. Pino	Research group:	vertebrate
Created:	2013-11-05 10:18:47	Last modified:	2025-02-22 15:12:02
Access level:	group members	Released:	2015-11-05 10:18:47
Creative Commons license:	CC0

70179		E. Cerdeño, C. I. Montalvo, and R. Sostillo. 2017. Deciduous dentition and eruption pattern in late Miocene Pachyrukhinae (Hegetotheriidae, Notoungulata) from La Pampa Province, Argentina. Historical Biology 29(3):359-375 [P. Mannion/M. Kouvari]
73341		C. I. Montalvo, A. R. Miño-Boilini, R. Sostillo, E. Cerdeño, M. C. Cardonatto and R. A. Bonini. 2020. The Scelidotheriinae Proscelidodon gracillimus (Xenarthra: Mylodontidae) from the Cerro Azul Formation (late Miocene), Argentina: Ontogenetic variability and taxonomy. Journal of South American Earth Sciences 102754 [P. Mannion/P. Mannion]
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]
85650		C. O. Romano, R. Bonini, S. Hemming, M. Cenizo, U. F. J. Pardiñas and F. J. Prevosti. 2023. Advances in the understanding of Neogene mammalian fauna in the Pampean region (central Argentina) through revising “biozone” hypotheses based on new dates and biochronological analyses. Ameghiniana 60(5):465-491 [J. Carrillo/K. Pino]
72326		R. Sostillo, E. Cerdeno, and C. I. Montalvo. 2018. Taxonomic implications of a large sample of Tremacyllus (Hegetotheriidae: Pachyrukhinae) from the late Miocene Cerro Azul formation of La Pampa, Argentina. Ameghiniana 55(4):407-422 [P. Mannion/M. Kouvari]
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]
65013		D. H. Verzi. 1999. The dental evidence on the differentiation of the ctenomyine rodents (Caviomorpha, Octodontidae, Ctenomyinae). Acta Theriologica 44(3):263-282 [C. Jaramillo/J. Carrillo]
71025		D. H. Verzi, C. I. Montalvo, and M. G. Vucetich. 1991. Nuevos restos de Xenodontomys simpsoni Kraglievich y la sistematica de los mas antiguos Ctenomyinae (Rodentia, Octodontidae). Ameghiniana 28(3-4):325-331 [P. Mannion/M. Kouvari]