Where: Mendoza, Argentina (34.9° S, 68.5° W: paleocoordinates 52.6° S, 35.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Quebrada de Los Fosiles Formation (Puesto Viejo Group), Ladinian to Ladinian (242.0 - 228.0 Ma)

• The Quebrada de Los Fosiles Formation has been dated as Early Triassic on the basis of biostratigraphy. However, Ottone et al. (2014) provided a SHRIMP U-Pb age for an ignimbrite at the top of the Quebrada de los Fosiles Formation. This date of 235.8 ± 2.0 Ma suggests a Ladinian-Carnian age for the Quebrada de Los Fosiles Formation, in contrast to the biostratigraphic age estimates provided by previous workers.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; fine-grained, brown sandstone

Size class: macrofossils

Preservation: mold/impression

Collected by G. Diaz in 1963; reposited in the MACN

Primary reference: M. D. Ezcurra, A. Lecuona, and A. Martinelli. 2010. A new basal archosauriform diapsid from the Lower Triassic of Argentina. Journal of Vertebrate Paleontology 30(5):1433-1450 [R. Butler/R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 98610: authorized by Richard Butler, entered by Richard Butler on 14.10.2010

Creative Commons license: CC BY (attribution)