The eastern border of the Floresta Massif Is affected by two major faults which relieve each other in the area of the present study. Each fault is caracterized by a proper structural style. The strata around the northerly Paz de Rio fault display reverse - drag relations, as the sediments of the footwall block define a major wedge against the fault, and as the hangingwall block is affected by a marginal syncline. The southerly Corrales fault, however, relates to a bending and inversion of the massif's eastern flank, without resembling a typical drape-induced detachment, however. Folding of this eastern flank produced probably some excess length of the sedimentary cover which was consumed within a small anticlinorium to the east of the massif. This anticlinorium is separated further east by faulted blocks or mesas from a more internal, folded zone of the Pisba high.