La Esquina (Triassic of Argentina)

Also known as Fasolasuchus

Where: La Rioja, Argentina (29.9° S, 68.0° W)

• Paleocoordinates: 39.7° S, 22.7° W (Wright 2013)

• coordinate estimated from map

• small collection-level geographic resolution

When: Coloradian other zone, Los Colorados Formation (Agua de la Peña Group), Norian (227.3 - 205.7 Ma)

• "upper levels" of the formation; 100 metres below top of formation; formation is considered to be latest Triassic in age

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; red siliciclastic sediments

• "The sequence was interpreted as deposited by moderately sinuous fluvial systems, which laterally interfinger with and grade into horizontally bedded flood-plain deposits. To the top of the sequence, thin-bedded sandstones and siltstones dominate and were deposited in ponds and as crevasse splays in overbank settings" (Arcucci et al. 2004)
• "The red beds of Los Colorados Formation are composed by successive thinning-upward cycles characterized by coarse- to medium-grained sandstones and fine-grained sandstones intercalated with siltstones, which progressively dominate to the upper part of the unit (Fig. 2). Coarse-grained sandstone beds are generally tabular in geometry, cross stratified (large-scale trough and tabular cross-bedding) and locally display horizontal lamination. Rounded pebbles and cobbles of chert, quartzite and metamorphic rocks commonly mantle set boundaries. Massive and horizontal laminated siltstones interfinger with rippled lamination fine-grained sandstones forms the uppermost portion of the cycles" (Arcucci et al. 2004)

Size class: macrofossils

Collected in 1970-71

Primary reference: J. F. Bonaparte. 1981. Descripción de "Fasolasuchus tenax" y su significado en la sistematica y evolución de los thecodontia. Revista del Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" 3(2):55-101 [J. Alroy/J. Wertheim/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 105694: authorized by Richard Butler, entered by Richard Butler on 24.02.2011

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Loricata -
Fasolasuchus tenax n. gen. n. sp.
Fasolasuchus tenax n. gen. n. sp. Bonaparte 1981 archosaur
PVL 3850, partial skeleton