Quebrada del Puente (Triassic of Argentina)

Where: Mendoza, Argentina (32.9° S, 69.2° W: paleocoordinates 52.4° S, 39.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lower Member (Potrerillos Formation), Longobardian (242.0 - 235.0 Ma)

• Tuffs from lower and middle sections dated at 239.2 ± 4.5 Ma, 239.7 ± 2.2 Ma and 230.3 ± 2.3 Ma, so lower member is likely latest Ladinian.

Environment/lithology: wet floodplain; lithified, black, carbonaceous shale

• "It represents a mix of braided-river channels, floodplain deposits, and high-sinuosity meandering channels." Martins-Neto et al., 2007

•The Cuyo Basin may be characterised as a passive rift basin produced as a result of generalised extension induced by crustal thinning and collapse of the Upper Palaeozoic (Gondwana) orogen (Llambías and Sato, 1990, 1995; Spalletti, 1999). It can be defined as a half graben that shows strong asymmetric structural and depositional features, as well as intrabasinal highs or transference zones that delimit different depocentres (Kokogián et al., 1988, 1993; Ramos and Kay, 1991; López Gamundí, 1994; Spalletti, 1999, 2001).

• "The organic-rich insect-bearing levels are finely laminated to massive shales, light grey when weathered and black when fresh. These bituminous layers are interbedded with fine conglomerate layers, tabular pebbly sandstones, and light-coloured tuffaceous sandstones that are almost vertically tilted owing to the local block faulting." Martins-Neto et al., 2007

Size classes: macrofossils, mesofossils

Preservation: adpression

Collected by O. F. Gallego & A. M. Zavattieri in 1995 & 2005

Primary reference: R. G. Martins-Neto, O. F. Gallego, and A. M. Zavattieri. 2007. A new Triassic insect fauna from Cerro Bayo, Potrerillos (Mendoza Province, Argentina) with descriptions of new taxa (Insecta: Blattoptera and Coleoptera). Alcheringa 31:199-213 [M. Clapham/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 115104: authorized by Matthew Clapham, entered by Jered Karr on 27.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Conchostraca
 Conchostraca -
Conchostraca indet. Sars 1867 clam shrimp
Insecta
 Blattodea - Blattulidae
Anablatta compacta n. gen. n. sp.
Anablatta compacta n. gen. n. sp. Martins-Neto and Gallego 2007 cockroach
MCNAM-PI 24294
 Blattodea - Subioblattidae
Potrerilloblatta stipanicici n. gen. n. sp. Martins-Neto and Gallego 2007 cockroach
MCNAM-PI 24263
 Blattodea - Delpuenteblattidae
Delpuenteblatta dangeloi n. gen. n. sp. Martins-Neto and Gallego 2007 cockroach
MCNAM-PI 24265/5
Lariojablatta neiffi n. sp. Martins-Neto and Gallego 2007 cockroach
MCNAM-PI 24260, 24302, CTES-PZ 7352
 Dicondylia - Triassoblattidae
? Triassoblatta sp. Tillyard 1919 winged insect
MCNAM-PI 24303
 Coleoptera - Permosynidae
Delpuentesyne menendezi n. gen. n. sp.
Delpuentesyne menendezi n. gen. n. sp. Martins-Neto and Gallego 2007 beetle
MCNAM-PI 24261, 24262a, 24262b, 24306, CTES-PZ 7353, 7354