Sedimentological studies involving grain size, heavy mineral and clay mineral analysis were carried on sample from Areado Formation. Lithologically, this formations is constituted by fine-to-very-fine and silty sandstones, rarely conglomeratic. They are mineralogically immature and the heavy mineral assemblage is formed of staurolite, epidote, kyanite and garnet, whose source rocks belong to Araxa, Canastra and Bambuí Groups and Botucatu Formation. These sediments have been deposited by a fluvial system which changed between changed meandering pelitic to psamitic as a function of climate during their sedimentation.Sedimentological studies involving grain size, heavy mineral and clay mineral analysis were carried on sample from Areado Formation. Lithologically, this formations is constituted by fine-to-very-fine and silty sandstones, rarely conglomeratic. They are mineralogically immature and the heavy mineral assemblage is formed of staurolite, epidote, kyanite and garnet, whose source rocks belong to Araxa, Canastra and Bambuí Groups and Botucatu Formation. These sediments have been deposited by a fluvial system which changed between changed meandering pelitic to psamitic as a function of climate during their sedimentation.