Pilcaniyeu road, near Rio Pichileufu: Lutetian, Argentina
collected by Piatnitzky

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Insecta - Hymenoptera - Formicidae
Ameghinoia piatnitzkyi n. gen., n. sp. Viana and Haedo Rossi 1957
3 specimens
recombined as Archimyrmex piatnitzkyi
(1 measurement)
see common names

Country:Argentina State/province:Rio Negro
Coordinates: 41.1° South, 70.8° West (view map)
Paleocoordinates:43.6° South, 61.1° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Period:Paleogene Epoch:Eocene
Stage:Lutetian 10 m.y. bin:Cenozoic 2
Key time interval:Lutetian
Age range of interval:47.80000 - 41.30000 m.y. ago
Stratigraphic resolution:group of beds
Stratigraphy comments: 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).
Lithology and environment
Primary lithology: lithified mudstone
Environment:crater lake Tectonic setting:volcanic basin
Geology comments: Volcanic caldera-lake beds
Modes of preservation:adpression
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"
Database number:138647
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:paleoentomology
Created:2013-01-23 13:53:15 Last modified:2017-05-23 16:34:15
Access level:the public Released:2013-01-23 13:53:15
Creative Commons license:CC BY
Reference information

Primary reference:

44403. 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]