Valle del Tonco (Eocene of Argentina)

Also known as Tonco Valley; 10 km north to Mina Don Otto

Where: Salta, Argentina (25.5° S, 65.9° W: paleocoordinates 27.8° S, 57.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Quebrada de los Colorados Formation, Bartonian (41.3 - 38.0 Ma)

• Lower levels of the Quebrada de los Colorados Formation (LC I); late middle Eocene

•Powell et al., 2011: Recently, geologic and paleontologic evidence allowed the correlation of the upper levels of Lumbrera with Geste, Casa Grande, and Quebrada de los Colorados Formations. Additionally, these levels were referred to the late-middle Eocene (Casamayoran SALMA -South American Land Mammal Age-, Barrancan subage) by an U/Pb dating of 39.9 Ma . The lower levels of the Lumbrera Formation are here referred to the Vacan subage of the Casamayoran SALMA.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: D. A. García-López, J. Babot, R. González and A. Scanferla. 2018. Cranial anatomy of an Eocene notoungulate mammal from northwestern Argentina with special reference on the ear region. Historical Biology 30(7):957-975 [P. Mannion/P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58765: authorized by Darin Croft, entered by Darin Croft on 23.02.2006, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Notoungulata - Archaeohyracidae
Archaeohyracidae "gen. et sp. indet. 1" Ameghino 1897 notoungulate
PVL 4362
aff. Eohyrax sp. Ameghino 1901 notoungulate
IBIGEO-P 2
 Notoungulata -
Toxodontia indet. Ameghino 1887 notoungulate
IBIGEO-P 12