Irati Formation, PR (Permian of Brazil)

Also known as Paraná Basin of State of Paraná

Where: Paraná, Brazil (25.5° S, 50.7° W: paleocoordinates 45.8° S, 29.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Irati Formation (Passa Dois Group), Artinskian (290.1 - 279.3 Ma)

• Rossmann & Maisch (1999) and Rossmann (2000, 2002) state that the fossils come from the Irati Formation but only give "Lower Permian" as the most precise age specification. However, in a quite recent publication it is stated that the Irati Formation is Artinskian in age, based on absolute ages obtained from zircons from a bentonite layer (Santos et al., 2006, Gondwana Res. 9).

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone and shale

• shale may be black and bituminous or non-bituminous and laminated

Size class: macrofossils

Preservation: mold/impression

Reposited in the BSP, SMF

• BSP = Bayerische Staatssammlung für Paläontologie und Historische Geologie, München [Bavarian State Collection of Palaeontology and Historical Geology, Munich]

•PIMUZ = Paläontologisches Institut und Museum der Universität Zürich [Department and Museum of Palaeontology of Zurich University]

•SMF = Senckenberg Museum, Frankfurt/Main

Primary reference: T. Rossmann and M. W. Maisch. 1999. Das Mesosaurier-Material in der Bayerischen Staatssammlung für Paläontologie und Historische Geologie: Übersicht und neue Erkenntnisse. Mitteilungen der Bayerischen Staatssammlung für Paläontologie und Historische Geologie 39:69-83 [J. Mueller/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90227: authorized by Johannes Mueller, entered by Torsten Liebrecht on 14.07.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• Specimens listed by Rossmann & Maisch (1999) are taxonomically revised and may originally have been referred to different taxa (in most cases this may have been the junior synonyms of the taxa currently considered valid).
Osteichthyes
 Sauropsida - Mesosauridae
Mesosauridae indet. Baur 1889 amniote
SMF-R-4470 (pars), 4491, 4492; "Mesosaurus oder Stereosternum"
Stereosternum tumidum Cope 1885 amniote
SMF-R-4470 (pars), 4471, 4484, 4485a+b, 4486, 4710 (large individual)
Brazilosaurus sanpauloensis Shikama and Ozaki 1966 amniote
BSP 1965 I 130, 1965 I 131; PIMUZ A/III 0192; information on PIMUZ specimen is from Rossmann (2002)