5.02b (103.71 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.
5.5 (10.29 ha Index 158)
This group has a very small territorial extension, occurring in small patches in the south of the Department of Flores and north of the Department of San Jose (Guaycuru). It occupies slightly convex slopes, with slopes of 1 to 3%, which have a cover of colluvial sediments of fine textures but that include stones and gravel. The soils correspond to Typical Eutric Brunosols, black and very dark brown in color, loamy to clayey loam texture, and high fertility (Black Prairies of medium differentiation). The use is pastoral although there are cultivated areas where the presence of stones is observed that does not seriously limit cultivation. These lands are included in the San GabrielGuaycuru unit on the map at a scale of 1:1.000.000 (DSF). Also corresponding to this group are small colluvial valleys that occur in the Departments. of Maldonado y Lavalleja, west of the Sierra de Animas, associated with drainage routes tributaries to the Solis del Mataojo stream; should be mentioned: Arroyo Navarro, Arroyo Tupambae, Arroyo Aguas Blancas, Arroyo Curupi, Arroyo del Sauce, etc. These valleys contain deep soils (Planosols and Alluvial) of very dark brown and black color, loam to silty loam texture and high fertility. They constitute areas of good pastoral aptitude, not arable, that make up the Valle Aigua unit on the map at a scale of 1:1.000.000. (DSF).
