Pilcaniyeu road, near Rio Pichileufu (Eocene of Argentina)

Where: Rio Negro, Argentina (41.1° S, 70.8° W: paleocoordinates 43.6° S, 61.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ventana Formation, Lutetian (47.8 - 41.3 Ma)

• Found near famous flora of Burdigalian age, so assumed to be Burdigalian (Middle Miocene) by Viana & Haedo Rossi, but more likely from the Ventana Formation of early Lutetian age. The locality was dated using 40Ar/39Ar analyses in Wilf et al. (2005) and recalculated in Wilf (2012), giving an age of 47.74 ± 0.05 Ma (million years ago).

• group of beds-level stratigraphic resolution

Environment/lithology: crater lake; lithified mudstone

• Volcanic caldera-lake beds

Size class: macrofossils

Preservation: adpression

Collected by Piatnitzky

• Repository: Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"

Primary reference: M. J. Viana and J. A. Haedo Rossi. 1957. Primer hallazgo en el hemisferio sur de Formicidae extinguidos y catalogo mundial de los Formicidae fosiles. Ameghiniana 1:108-113 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138647: authorized by Matthew Clapham, entered by Matthew Clapham on 23.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hymenoptera - Formicidae
"Ameghinoia piatnitzkyi n. gen. n. sp." = Archimyrmex piatnitzkyi
"Ameghinoia piatnitzkyi n. gen. n. sp." = Archimyrmex piatnitzkyi Viana and Haedo Rossi 1957 bulldog ant