Gateway to the Paleobiology Database
Los Chañares (1st cycle) (Triassic of Argentina)

Where: La Rioja, Argentina (29.8° S, 67.8° W: paleocoordinates 46.5° S, 33.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Los Rastros Formation (Agua de la Peña Group), Carnian (235.0 - 221.5 Ma)

• Carnian age based on radiometric constraints from underlying Chañares Formation in Marsicano et al. (2015).

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, black mudstone and sandstone

• Ichigualasto–Villa Unión Basin, developed along the western Gondwana margin associated with extension focused along the northwest-trending Paleozoic sutures. This extension originated from the breakup of Pangaea during the end of Permian and start of the Triassic. Synrift phase II - accommodation space generated by tectonic subsidence.
• lacustrine black shales and deltaic sandstones

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected in 1995

• "The samples from the lower section (1st sedimentary cycle) of the Los Rastros Formation were collected by O.F. Gallego, Andrea Arcucci, Catherine Forster, Cathleen May & Raymond Rogers during a field trip in 1995." Martins-Neto et al., 2006

•Specimens kept in either PULR-I (Paleontology Collection, Museo de Ciencias Naturales, Universidad Nacional de La Rioja, La Rioja, Argentina) or CTES-PZ: (Paleozoological Collection, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Corrientes, Argentina)

Primary reference: R. G. Martins-Neto, A. Mancuso, and O. F. Gallego. 2005. The Triassic Insect Fauna from Argentina. Blattoptera from the Los Rastros Formation (Bermejo Basin), La Rioja Province. Ameghiniana 42(4):1-21 [M. Clapham/J. Karr] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123115: authorized by Matthew Clapham, entered by Jered Karr on 11.01.2012

Creative Commons license: CC BY (attribution)