Passo das Tropas (Triassic of Brazil)

Where: Rio Grande do Sul, Brazil (29.7° S, 53.8° W: paleocoordinates 51.8° S, 18.8° W)

• coordinate estimated from map

When: Santa Maria Formation, Ladinian (242.0 - 237.0 Ma)

• Sommer et al (1985) argue for a T2 age, whereas Bortoluzz et al had previously believed a T3 age most likely - all based on floristic evidence and correlations

Environment/lithology: fluvial; sandstone and conglomerate

• Tectonically active small basins with an en echelon arrangement. Extensional basins are controlled by the structures of the Damara-Katanga-Mozambique (DKM) mobile belt. The South American branch of the Waterberg-Omaruru fault system (Namibia) is related to the Waterberg rift basin.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Primary reference: I. D. Pinto. 1956. Artrópodos da Formaçāo Santa Maria (Triássico Superior) do Rio Grande Do Sul, com notícias sôbre alguns restos vegetais. Boletim da Sociedade Brasileira de Geologia 5:75-95 [M. Clapham/J. Karr/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 116119: authorized by Matthew Clapham, entered by Jered Karr on 05.09.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corystospermales - Corystospermaceae
Pteruchus sp. Thomas 1933
Dicroidium sp. Gothan 1912
 Peltaspermales - Umkomasiaceae
Pachypteris sp. Brongniart 1828
 Coniferales -
"? Stenorachis sp." = Stenorhachis, "Stenorachis sp." = Stenorhachis, Samaropsis sp.
"? Stenorachis sp." = Stenorhachis Saporta 1879
"Stenorachis sp." = Stenorhachis Saporta 1879
Samaropsis sp. Göppert 1864
 Pteridospermales -
? Thinnfeldia sp. Ettingshausen 1852 cycads
Sewardia sp. Zeiller 1900
 Equisetales - Equisetidae
Neocalamites sp. Halle 1908
Zuberia sp. Frenguelli 1944
 Trichoptera -
Sanctipaulus mendesi n. gen. n. sp.
Sanctipaulus mendesi n. gen. n. sp. Pinto 1956 caddisfly
URGS 241
 Diplostraca - Lioestheriidae
Estherites wianamatensis Mitchell 1927 clam shrimp
 Diplostraca - Euestheriidae
Euestheria azambujai n. sp. Pinto 1956 clam shrimp
 Diplostraca - Limnadiidae
Estheriina sp. Jones 1897 clam shrimp