Natural Park Sierra de Aracena y Picos de Aroche belongs, like the Natural Park Sierra Norte de Sevilla Natural Park Sierra de Hornachuelos, the "Zona Ossa- Morena ", which occupy the southern part of the Hesperian Massif.
The most important materials are slate, greywacke, quartzite, schist and phyllite, in addition to acidic rocks as granite. Mainly belong to the Devonian and Ordovician (Figure 4).
Most are of metamorphic origin (approximately 62.90% of the total area) and on the slopes with an alignment NO-SE. The rest of the Natural Park
match lithologies of sedimentary origin (20.94%) or igneous (plutonic, 12.21%, 3.95% volcanic) (Figure 4).
Figure 4. Geology and Litole
ogy in the Natural Park
The most important materials are slate, greywacke, quartzite, schist and phyllite, in addition to acidic rocks as granite. Mainly belong to the Devonian and Ordovician (Figure 4).
Most are of metamorphic origin (approximately 62.90% of the total area) and on the slopes with an alignment NO-SE. The rest of the Natural Park
match lithologies of sedimentary origin (20.94%) or igneous (plutonic, 12.21%, 3.95% volcanic) (Figure 4).
Figure 4. Geology and Litole
ogy in the Natural Park 
Source: Geological and lithological map. Digital Atlas of Counties Land. CSIC-Department of the Environment, 2000
The terrain is steep in certain areas to be Natural Park through, NW-SE, geomorphological formations in alternating high peaks and plains. This feature has determined that the isolated nature of these areas have suffered historically, preventing access and communications with the capital. The altitudes range from 160 m up to 1,040 meters it reaches the Sierra de los Bonales.
In general the landscape is hilly with moderate altitude, the highest levels found in the central highlands. Most of the land has slopes ranging from 4.5% (inclined plane) to 34.5% (wavy inclined) (Fig. 5, Table 2), so the Park has a gentle terrain.
Figure 5. Pending in the Natural Park, according to the classification of expenditures (1993)
Source: Digital Terrain Model. Ministry of Environment (1998)
major faults Natural Park, which follow the direction esteoeste, mostly belong to the Beja-Valdelarco systems and Ficallo-Almonaster, and are responsible for the timely appearance of landscapes and terrain abrupt. Along with these, there are other secondary faults and perpendicular orientation, as far Zufre Santa Olalla del Cala.
should be noted the presence of caverns and caves, as the "Cave of Wonders" in Aracena, associated with karstic some areas of the Sierra.
Natural Park, as a result of its geological history, mainly the constant upwelling of igneous rocks and subsequent metamorphism of sedimentary rocks, but has an extremely rich in mineral resources.
The terrain is steep in certain areas to be Natural Park through, NW-SE, geomorphological formations in alternating high peaks and plains. This feature has determined that the isolated nature of these areas have suffered historically, preventing access and communications with the capital. The altitudes range from 160 m up to 1,040 meters it reaches the Sierra de los Bonales.
In general the landscape is hilly with moderate altitude, the highest levels found in the central highlands. Most of the land has slopes ranging from 4.5% (inclined plane) to 34.5% (wavy inclined) (Fig. 5, Table 2), so the Park has a gentle terrain.
Figure 5. Pending in the Natural Park, according to the classification of expenditures (1993)
Source: Digital Terrain Model. Ministry of Environment (1998)
major faults Natural Park, which follow the direction esteoeste, mostly belong to the Beja-Valdelarco systems and Ficallo-Almonaster, and are responsible for the timely appearance of landscapes and terrain abrupt. Along with these, there are other secondary faults and perpendicular orientation, as far Zufre Santa Olalla del Cala.
should be noted the presence of caverns and caves, as the "Cave of Wonders" in Aracena, associated with karstic some areas of the Sierra.
Natural Park, as a result of its geological history, mainly the constant upwelling of igneous rocks and subsequent metamorphism of sedimentary rocks, but has an extremely rich in mineral resources.
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