Laguna Guatraché (Neogene of Argentina)

Where: La Pampa, Argentina (37.7° S, 63.5° W: paleocoordinates 37.9° S, 61.2° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• The Cerro Azul Formation is referrecl to the Huayquerian (Late Miocene) based on the presence of severa! groups of fossil mammals.

•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). 7.154 Ma (6.904 - 7.560 Ma) for Guatreché.

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collection methods: 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: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 204361: authorized by Philip Mannion, entered by Miranta Kouvari on 06.09.2019, edited by Grace Varnham and Kateryn Pino

Creative Commons license: CC BY (attribution)

Taxonomic list

Aves
 Gruiformes - Phorusrhacidae
Phorusrhacidae indet.1 Ameghino 1889 terror bird
GHUNLPam 6325, shaft and distal end of left tibiotarsus
Mammalia
 Cingulata - Dasypodidae
Proeuphractus sp. Ameghino 1886 armadillo
Macroeuphractus morenoi Lydekker 1894 armadillo
Doellotatus inornatus6 Rovereto 1914 armadillo
Chasicotatus ameghinoi6 Scillato-Yané 1977 armadillo
 Cingulata - Panochthidae
Hoplophorus sp.3 Lund 1838 edentate
 Cingulata -
Coscinocercus sp.3 Cabrera 1939 edentate
Aspidocalyptus castroi3 Cabrera 1939 edentate
 Notoungulata - Toxodontidae
Stenotephanos plicidens3 Ameghino 1885 notoungulate
 Notoungulata - Mesotheriidae
Pseudotypotherium subinsigne5 Rovereto 1914 notoungulate
GHUNLPam 19062
 Notoungulata - Hegetotheriidae
Paedotherium minor5 Cabrera 1937 notoungulate
 Rodentia - Octodontidae
Metacaremys dimi n. sp.2 Piñero et al. 2021 caviomorph
Holotype: MMH-GUA 20-01, and GHUNLPam 8323, MMH-GUA 20-02
 Rodentia - Hydrochoeridae
Cardiatherium orientalis3 caviomorph
Cardiatherium orientalis in older papers
 Rodentia - Dinomyidae
Diaphoromys gamayensis4 Kraglievich 1931 caviomorph
GHUNLPam 5133, right hemimandible with p4–m3
 Panameriungulata - Macraucheniidae
Scalabrinitherium bravardi3 Ameghino 1883 placental
GHUNLPam 5138, left partial maxilla with M1 (incomplete)-M3, and GHUNLPam 5139, right trigonid of a lower molar,