Casa Grande and Vizcarra Rivers (Eocene of Argentina)

Also known as El Aguilar

Where: Jujuy, Argentina (23.2° S, 65.7° W: paleocoordinates 25.8° S, 55.0° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Vacan mammal zone, Lower Member (Lumbrera Formation), Ypresian (56.0 - 47.8 Ma)

• Lower Lumbrera Formation, "Faja Verde II" or lower, corresponding to the Vacan SALMA

•Fernicola et al. 2021: new 238U-206Pb isochron age (46.2 Ma) obtained from samples taken on various independent points across paleosol and matrix positioned at the top of the lower section of the Lumbrera Formation. The new age is consistent with the hyperthermal scheme and constrains the deposition of the lower section of the Lumbrera Fm. between 55–46.2 Ma. Subsequently, the upper sections of the Lumbrera Formation are now constrained between 46 and 40 Ma (Lutetian) (see Fernicola et al. 2021: New assemblage of cingulates)

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Primary reference: J. E. Powell, M. J. Babot, D. A. García López, M. V. Deraco, and C. Herrera. 2011. Eocene vertebrates of northwest Argentina: annotated list. In J. Salfity, R. A. Marquillas (eds.), Cenozoic Geology of the Central Andes of Argentina 349-370 [J. Zijlstra/J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176658: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 24.02.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Osteichthyes
 Ceratodontiformes - Lepidosirenidae
Lepidosiren paradoxa Fitzinger 1837 South American lungfish
MLP 72-IV-4-1, fragments of pterygoid and splenial plates; DCNS V 500, isolated tooth plates; unnumbered remains in MLP