5.02b (61.24 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.
10.12 (42.76 ha Index 193)
It is a group of great territorial significance and is located in the Departments. of Florida, North of San Jose, northeast of Colonia, southeast of Soriano, Flores, South of Durazno and southwest of Lavalleja, that is, in the entire region of the crystalline basement, expressing itself as discontinuous interfluves of variable sizes, convex, normally associated with interfluves with cuspidal flattenings with water holes and sporadically small rocky outcrops. It typically appears on Route 23, near the La Carolina establishment (Department of Flores) and in the Colonia Treinta y Tres Orientales, on Route 6 (Department of Florida). The geological material corresponds to clayey silt sediments of 1 to 8 meters in thickness, supported on the crystalline basement. The relief is undulating to gently undulating, with slopes of 2 to 5%. The predominant soils correspond to Luvic Ruptic Vertisols (Grumosoles) and Typical Luvic Eutric Brunosols (vertisolic Black Prairies), black in color, loamy to clayey loam texture, high fertility and moderately well drained. The predominant use is pastoral, with good quality winter-summer meadow vegetation and generally high density of wire grass. There are cultivated areas, either for forage purposes (dairy basin) or winter-summer crops in general. This group integrates the La Carolina unit and, secondarily, the Isla Mala unit of the 1:1.000.000 (DSF) scale chart.
