The clayey sediments of the Alemoa Member gradually give way to the more sandy, rarely conglomeratic, Caturrita Formation, which finishes with an unconformity.

After this erosional event follow the Rhaetian sediments of the Mata Sandstone, the third unit of the Santa Maria Supersequence.

[5] A U-Pb (Uranium decay) dating found that the Caturrita Formation dated around 225.42 million years ago, putting it less than 10 million years younger than the Santa Maria and Ischigualasto Formations, from where the earliest dinosaurs are known.

From the town of Taquari they follow for 250 kilometers a thin band in the central part of the state in an east-westerly fashion right up to Mata.

[8] The sediments are of continental nature (red beds) and form massive sandstone and siltstone bodies.

This is the reason, why this biozone recently has been renamed as "Mammaliamorpha Cenozone" to underline the importance of the cynodont fossils.

[13] The fossil finds are concentrated around three major areas: Santa Maria and northern surroundings (Água Negra) Faxinal do Soturno Candelária and surroundings (Linha São Luis) The following taxa have been discovered so far in the Caturrita Formation: Unnamed prosauropod genus present in Rio Grande do Sul, Brazil.

[19] Unaysaurus U. tolentinoi Rio Grande do Sul, Brazil Sauropodomorph Undetermined phytosaur genus.