El Cajón Valley (Miocene of Argentina)

Where: Catamarca, Argentina (26.6° S, 66.3° W: paleocoordinates 26.9° S, 64.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: El Morterito Formation, Huayquerian (9.0 - 6.8 Ma)

• The fossiliferous beds correspond to the El Morterito Formation (Turner, 1973), sequence II of the Playa del Zorro ‘‘alloformation’’ (Bossi et al., 1992, 1993; Esteban and Nasif, 1996). The upper part of this sequence (IIb and IIc subsequences) is correlated with the Andalhuala Formation in the Santa Mar ́ıa Valley, Catamarca Province (Bossi et al., 1993).

• formation-level stratigraphic resolution

Environment/lithology: "floodplain"; lithified, fine-grained sandstone and lithified, paleosol/pedogenic, green siltstone

• These sediments were deposited in a floodplain environment with occasional flash floods, which was rapidly colonized by vegetation.
• thinly-bedded, fine-grained sandstones interbedded with dark greenish siltstones. Interbedded paleosols commonly host calcareous concretions and rhyzoconcretions.

Size class: macrofossils

Primary reference: N. L. Nasif, S. Musalem, and E. Cerdeño. 2000. A new toxodont from the late Miocene of Catamarca, Argentina, and a phylogenetic analysis of the Toxodontidae. Journal of Vertebrate Paleontology 30(3):591-600 [C. Jaramillo/C. Suarez-Gomez/C. Suarez-Gomez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 141369: authorized by Carlos Jaramillo, entered by Catalina Suarez-Gomez on 26.03.2013, edited by Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Panchelidae
Phrynops sp. Wagler 1830 sideneck turtle
PVL 3351, partial carapace and associated fragments
Mammalia
 Notoungulata - Toxodontidae
Calchaquitherium mixtum n. gen. n. sp.
Calchaquitherium mixtum n. gen. n. sp. Nasif et al. 2000 notoungulate
PVL 4794