10.8b (22.04 ha Index 184)
Most of the gently undulating lands in the Departments correspond to this group. of Canelones and San José, located in the surroundings of population centers such as Libertad, San José, Tala, Canelones, Saint Baptist, etc. They exist to a lesser extent in the Departments. of Colonia y Maldonado. The geological material corresponds to clayey silt sediments of brown color and normally with calcium carbonate concretions. The relief is gently undulating to undulating with predominance of slopes of 1 to 4%, with a region around Tapia with slopes of 3 to 6%. It corresponds to areas with a lower degree of current erosion, defined as moderate, with associated areas of light erosion. Sheet erosion then predominates, with variable loss of the upper horizons. This group is normally located in positions with low erosion risk, such as high interfluves and gently sloping slopes. The soils correspond to Typical Ruptic and Luvic Vertisols (Grumosoles) and Typical Eutric and Subeutric Brunosols (Black and Medium Brown Grasslands), black or very dark brown in color, silty clay loam texture, high fertility and moderately well drained. This group corresponds to the Tala-Rodríguez, Libertad and San Jacinto units and integrates to a lesser extent the Ecilda Paullier-Las Brujas and Isla Mala units of the 1:1.000.000 (DSF) scale chart.
5.02b (0.96 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.
