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Irati (Permian of Brazil)

Also known as Iraty; Paraná Basin

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

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Irati Formation (Passa Dois Group), Artinskian (290.1 - 279.5 Ma)

• Karl et al. (2007) state that the fossils come from the Irati Formation but only give "Early Permian (=Cisuralian)" 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).

• member-level stratigraphic resolution

Environment/lithology: offshore; black shale

• No lithology given in Karl et al. (2007). However, specimens in the collections of the Museum für Naturkunde Berlin coming from Irati are all preserved in black bituminous shale (Müller, 2009).

Size class: macrofossils

Preservation: mold/impression

Collected by P. Dusén, among others in 1909, 1959; reposited in the MfN

• GZG.V = Vertebrate Collection of Geoscience Center of Göttingen University (Geowisschenschafliches Zentrum der Universität Göttingen)

•Two of the three unnumbered Irati specimens in the MfN collections are accompanied by a label with the inscription "Fran: Riksmuseets Zoo-Palaeontologiska Afd. STOCKHOLM". Specimen MB.1960.12 formerly was reposited in the collections of the Palaeontological Museum of the University of Rio Grande do Sul (coll. no. 991193, previously 2664).

Primary reference: H.-V. Karl, E. Gröning, and C. Brauckmann. 2007. The Mesosauria in the collections of Göttingen and Clausthal: implications for a modified classification. Clausthaler Geowissenschaften 6:63-78 [J. Mueller/T. Liebrecht] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90323: authorized by Johannes Mueller, entered by Torsten Liebrecht on 16.07.2009

Creative Commons license: CC BY (attribution)