METAGO I limestone quarry (Permian of Brazil)

Also known as Paraná Basin

Where: Goiás, Brazil (17.3° S, 52.7° W: paleocoordinates 37.5° S, 27.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Assistencia Member (Irati Formation), Artinskian (290.1 - 279.3 Ma)

• The authors give a Sakmarian age of the Irati Formation referring to Pinto (1972) and Oelofsen & Araújo (1987). However, in a fairly 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).

•The presence of limestones (see lithological description) indicates that the locality is within the Assistência Member of the Irati Formation (see Santos et al., 2009, J. S. Am. Earth Sci., Article in Press, doi:10.1016/j.jsames.2008.12.002)

• group of beds-level stratigraphic resolution

Environment/lithology: dolomitic, gray, white, yellow lime mudstone and dolomitic, white, yellow lime mudstone

• "afloramento com sedimentos de aproximadamente sete metros de espessura, dos quais os três metros mais superiores são de calcário de coloração cinza-clara a quase preta, finamente laminado, por vezes intercalado por finas lentes de calcário mais claro (branco-amarelado); abaixo deste, ocorre calcário mais compacto de laminação menos evidente, de coloração branco-amarelada. Os restos de Mesosauridae (Brazilosaurus sanpauloensis e Stereosternum tumidum), ocorrem praticamente em todos os níveis. [Exposure with deposits of seven meter thickness, the upper three meters of which are made up of finely laminated, light gray to almost black limestone with occasional intercalations of thin lenses of limestone of lighter (yellowish white) color; below is a yellowish white limestone which is more compact and with less distinct lamination. Remains of mesosaurs (Brazilosaurus sanpauloensis and Stereosternum tumidum) actually occur in all of these beds.]" (Sedor & Ferigolo, 20001)

Size class: macrofossils

Preservation: mold/impression

Collection methods: mechanical,

• MCN.P = Museu de Ciências Naturais, do Setor de Ciências Biológicas da Universidade Federal do Paraná [Museum of Natural Sciences, Section of Biological Sciences of the Federal University of Paraná]

Primary reference: F. A. Sedor and J. Ferigolo. 2001. A coluna vertebral de Brazilosaurus sanpauloensis Shikama e Ozaki, 1966 da Formação Irati, Permiano da Bacia do Paraná (Brasil) (Proganosauria, Mesosauridae). Acta Biológica Paranaense, Curitiba 30(1-4):151-173 [J. Mueller/T. Liebrecht/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89833: authorized by Johannes Mueller, entered by Torsten Liebrecht on 15.06.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• No number of specimens of Stereosternum tumidum is given in the primary reference. Given that there is only one specimen referred to Brazilosaurus and that Mesosaurs are said to occur throughout the section, Stereosternum, however, appears to outnumber Brazilosaurus by far.
Osteichthyes
 Sauropsida - Mesosauridae
Brazilosaurus sanpauloensis Shikama and Ozaki 1966 amniote
MCN.P. 564
Stereosternum tumidum Cope 1885 amniote
no details given