The Alcantilados Plateau situated in the center-south region of the Mato Grosso State in the interfluve between São Lourenço and Poxoréo rivers at the Dom Aquino and Poxoréo Municipalities, presented one of the most beautiful landscape sceneries of the state, where the ridge mountains relief presented with planed summit at the board form.

In this compartimentation we can observe the geomorphological process developed itself regionally since the Furnas Formation (Silurian to the Lower Devonian) deposition, until the recent, with the accentuated passages in the Middle to the Upper Devonian (Ponta Grossa Formation), Carboniferous (Aquidauana Formation), Permian (Palermo Formation), Upper Jurassic to the Lower Cretaceous (Botucatu Formation), Middle to the Upper Cretaceous (Bauru Group) and also across of Tertiary in continuance to the Quaternary.

These processes give origin to the abrupt escarped faces and to levels surfaces at the top of the rocks sequence, just as occur in the Parnaíba and Progesso Mountains, which are bordered by echeloned structural crests cut by deep valleis.

The leading factor is refered to the top portions with the presence of hard crusts and siliceous pavement of flagstones locally, constituted by the silcretic rocks in association with fibrous silica compounds, carbonated rocks with traces of manganese and iron, refered the Cachoeira do Bom Jardim and Cambambe Formations depositions, to form a part of the Bauru Group.

Some studies wich are being developed with relation to siliceous migration since the top until the base of predominance of rocks sequence regionally and which constitute the Alcantilados Plateau conduct us to idealized new concept, about the formation of these silcretics crust, and its resitance to the erosive processes, commouns in anothers areas of the plateau.