5.02b (69.69 ha Index 88)
It is the most important group, since it occupies more than 80% of the lands in this subzone. It exists repeatedly in the Departments. of Florida and in the Department of Flores (Tips of the San Jose) and in the rest of the region defined for zone 5. The relief is undulating and strongly undulating, with modal slopes of 5 to 7%. The geological material corresponds to variable lithologies of pre-Devonian rocks, such as granites, migmatites, schistose metamorphic rocks (around Rosario), etc. The soils are moderately deep and superficial Subeutric Haplic Brunosols (moderately deep Brown Grasslands and Regosols), to which Inceptisole (Lithosols) are associated, sometimes very superficial. The upper horizon is brown and reddish brown, sometimes yellowish brown, with a loamy texture, gravelly loam or sandy loam with abundant gravel, fertility is medium, sometimes low. The rockiness is moderate and varies between 2 to 10% of the area with outcrops. Throughout the area there may be narrow lowlands, associated with drainage routes of little importance, which contain hydromorphic Luvic Gleysols (Humic Gley) and Typical Eutric or Luvic Brunosols (Black Prairies and Maximal Brown Prairies), which contain very good summer pastures. The use is pastoral. This group corresponds to the San Gabriel-Guaycuru unit on the 1:1.000.000 (DSF) scale chart.
5.4 (47.32 ha Index 114)
This group is frequent, although in a small area, throughout the crystalline area (zone 5) and good examples are those existing in San Gabriel (Route 6 and 56) and Reboledo in the Department of Florida and south of Cardona, on route 2, in the Department of Colonia. They occur in interfluve positions where there are small plateaus, sometimes with springs, with slopes of 3 to 5% at the edges (high hills). The soils developed from crystalline materials, and in part, from weak and discontinuous clayey silt sediments that cover them. They are moderately deep and superficial, with loamy textures, medium fertility, sometimes low, moderately well to well drained. We also find soils of black or very dark brown color, loamy to clayey loam texture, high fertility and moderately well drained. Soils of minimal differentiation, very dark, heavy colors, imperfect drainage and high fertility are associated. The use is pastoral with some areas under cultivation. This group was integrated into the San Gabriel-Guaycuru unit on the 1:1.000.000 (DSF) scale chart.
