Rio Cabeça, Santa Maria Homestead (Permian of Brazil)

Where: Brazil (22.4° S, 47.7° W: paleocoordinates 44.0° S, 24.4° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• 9.5 cm thick bed at the base of the Taquaral Member. The fossiliferous bed lies in erosional disconformity upon sandstones of the Tatuí Formation, which are penetrated locally by irregular, narrow tubular ichnofossils filled by sediment from the fossiliferous bed.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, gray, conglomeratic sandstone

• The environment of the Irati Formation is unclear - it lacks all typical marine fossil groups but has Mesosaurs so is likely freshwater (but could be highly restricted marine).
• Light gray to gray, fining-upward, cross-laminated conglomeratic sandstone with angular to rounded, abundant granules and rare pebbles of quartz and chert dispersed in a very fine to coarse sandy matrix.

Size classes: macrofossils, mesofossils

Primary reference: A. Chahud, T. R. Fairchild, and S. Petri. 2010. Chondrichthyans from the base of the Irati Formation (Early Permian, Paraná Basin), São Paulo, Brazil. Gondwana Research 18:528-537 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51070: authorized by Tom Olszewski, entered by Tom Olszewski on 26.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Euselachii - Sphenacanthidae
Sphenacanthus sanpauloensis n. sp. Chahud et al. 2010 elasmobranch
 Orodontiformes - Orodontidae
Orodus ipeunaensis n. sp. Chahud et al. 2010 chimaera
 Petalodontiformes - Petalodontidae
Itapyrodus punctatus Silva Santos 1990 chimaera