Puesto Almada, 15 km north of the village of Cerro Cóndor, 30m above fish beds (Jurassic of Argentina)

Where: Chubut, Argentina (43.3° S, 69.1° W: paleocoordinates 40.1° S, 29.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Puesto Almada Member (Cañadón Asfalto Formation), Oxfordian (163.5 - 157.3 Ma)

• The specimen was found approximately 30m above the Almada fish fauna (López-Arbarello et al., 2008), in sediments alternatively referred by Rauhut (2006a) and Cúneo et al. (2013) to the Cañadón Calcáreo Formation (Proserpio, 1987) or by Cabaleri et al. (2010a) to the Puesto Almada Member of the Cañadón Asfalto Formation. Regardless of the referral to a particular geological unit, an early Upper Jurassic age (Oxfordian) has recently been established for this section by radiometric dating (Cabaleri et al., 2010b; Cúneo et al., 2013).

•Cabaleri et al. (2010b) and Gallego et al. (2011) published a U-Pb dating of a tuff from these beds (collected 2 km north of the locality where MPEF-PV 3838 was found) that yielded a lower Oxfordian age (early Late Jurassic; 161 Ma. ± 3 [95% confidence decay-constant errors included]). Finally, a new U-Pb radiometric dating (Cúneo et al., in press) also yielded an Oxfordian age (157.4 Ma. ± 0.045 [internal analytical uncertainty]) for the sedimentary sequence that crops out at Puesto Almada. Therefore, the age of the sedimentary sequence in which Almadasuchus (MPEF-PV 3838) was found can be confidently considered as early Late Jurassic in age

Environment/lithology: fluvial; sandstone

• A coarsening upwards sequence with an increasing amount of fluvial sandstones, often with cross-bedding structures and fine to medium-grained, often tuffacious overbank deposits. Rare tuff layers are also present. The specimen described here is derived from one of the sandstone layers some 30 m above the fish beds of the Almada fauna

Size class: macrofossils

Collection methods: quarrying, surface (in situ), mechanical,

• Museo Paleontol´ogico Egidio Feruglio (MPEF) collection

Primary reference: D. Pol, O. W. M. Rauhut, A. Lecuona, J. M. Leardi, X. Xu and J. M. Clark. 2013. A new fossil from the Jurassic of Patagonia reveals the early basicranial evolution and the origins of Crocodyliformes. Biological Reviews 88(4):862-872 [R. Benson/R. Benson/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140108: authorized by Roger Benson, entered by Roger Benson on 01.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Loricata -
Almadasuchus figarii n. gen. n. sp.
Almadasuchus figarii n. gen. n. sp. Pol et al. 2013 crocodilian
Holotype and only specimen MPEF PV 3838