[1][3] The Morro Pelado Member was deposited in smaller lakes, alluvial plains, fluvial meanders, delta systems and temporary bodies of water.

The rock deposits of Morro Pelado were covered by aeolian stones, such as the dunes of the Pirambóia Formation.

It is 250–300 metres (820–980 ft) thick and mainly composed of fine to medium-grained reddish sandstones, usually stratified, with fossils being found on its pelitic intercalations.

[4] The rocks deposits of the Serrinha and Morro Pelado Members, as well as the abundant conchostracan fossils, indicate a freshwater environment, with Serrinha being composed of shallow lakes with occasional storms and Morro Pelado being composed of small lakes, alluvial planes, meanders and temporary bodies of water, which were later covered up by dunes.

The increased occurrence of aeolian sandstone in Morro Pelado indicate a drier climate with greater aridity.

The fauna is composed of Invertebrates, such as bivalves, gastropods and conchostracans, and vertebrates like palaeonisciform and elasmobranch fish such as Xenacanthus and Sphenacanthus.

Tetrapods are only found in the upper Morro Pelado Member, and are represented by terrestrial herbivores like the dicynodonts Endothiodon and Rastodon, the pareiasaur Provelosaurus, a tapinocephalid and the saber-toothed Tiarajudens.

[4] Stromatolites have also been found in the formation, interpreted as having developed in waters that were shallow, clear and warm and in habitats that were inhospitable for competitors.