This work deals with growing erosion - deep gullies - located at Cachoeira do Campo District, Ouro Preto, State of Minas Gerais. Archean aged gnaisses and migmatites with granodiorític to tonalític-throndjemitic composition occur at that region. Thick soil cover (15-20 m) becomes rare outcrops. The whole region is affected by erosive features which were reported in a map which represents their present evolution stage and spatial distribution. The erosion forms could be assembled in groups according to their morphology, similar processes and characteristics. Despite the general degradation of regional landscape it could be seen that only 14 out of 109 gullies reported are actually in activity, with groundwater displaying an important role, through piping phenomena. Superficial erosion processes affect the slopes and the front of several gullies but in a small influence range in most of them. The active gullies are located near Catete hills (south of the area) or bordering urban areas and suffer their influence. In the first case, as a hydrological reload zone, a major groundwater influence is expected on the environment but the lack of facilities and the unsuitable land use around the urban areas give rise to the reactivation of the erosion processes. Some of these forms represent typical situations and were subject to a more accurate study. The comparative study of 1949 and 1986 is aerial photographic sets permitted to evaluate the erosion growth and evolution rate. Retreats with more than a hundred meters were reported. This work was supported by FAPEMIG and developed at Departamento de Geologia, Escola de Minas, UFOP.