The Canchos de las Sábanas lie to the east of the town of Berzocana; they can be reached by the road linking Berzocana to Cañamero and Solana de Cabañas. The lower part of these huge quartzite rocks also contains the caves known as the Cueva de los Morales and the Cueva de los Cabritos, which can be reached from the track that climbs to the Casa Rural (Rural Accommodation) of La Finca de la Sierra; the route is duly signposted.
The materials that make up the valleys of these rivers are those of the core and the southwest flank of the great Ibor-Guadalupe anticline, which is some 15 km wide at this point and has been worn down by erosion to reach the deepest area of the so-called “Grupo Ibor” from the Upper Neoproterozoic or Ediacaran (some 550 million years ago).
Lithologically the series consists of shale and chalco-schist strata alternating with others of sandstone and conglomerates. Among these are inserted some discontinuous levels of dolomite limestone some 25 m thick and bluish in colour, which outcrop in the vicinity of the Granja de Mirabel adjacent to some old limestone kilns, where they were exploited so as to build their hamlet and the historical Monasterio de Guadalupe. These calcareous rocks appear on the other flank of the Ibor-Guadalupe anticline near the hamlet of La Calera (Alía), where they were also extracted for lime manufacture (see Geosite no. 8 “Hornos de La Calera”).
In the shale remains of algae filaments of the genus Vendotaenia are frequently met with, and the limestone contains marine algae (stromatolites) that can be dated as being from the Ediacaran period; this reveals that the rocks originated as a wide marine platform.
The area currently features strong relief elements towards the north owing to recent faults of some significance from the final phase of Alpine orogeny; these constitute the watershed between the river basins of the Tajo to the north and the Guadiana to the south.
The Berzocana access road provides a panoramic view of this geomorphologic monument that allows the observation of the geological elements described above. Its peaks look out on the wide slatey Trujillo peneplain with the towns of Berzocana, Solana, Garciaz, and Aldeacentenera.
The Armorican quartzites contain traces of various marine invertebrates of the Ordovician period (Cruziana, Skolithos, Daedalus…) and the grey shales of the Ediacaran hold fine examples of algae filaments (vendotaenids); the deposits of the cuttings of the Berzocana-Cañamero road are significant.
Beneath the quartzite projections of the hillside of this sierra can be found the caves known as the Cueva de la Sábana, Cueva de los Cabritos, and the Cueva de los Morales. Furthermore, 5 km to the southeast lies the rocky shelter of El Risquillo de Paulino, with its schematic cave paintings with anthropomorphic and zoomorphic motifs dating from the Chalcolithic period; owing to their great archaeological value they are protected by a grill.
One of these quartzite projections is crossed by a small stream that falls into the void to create a waterfall known in modern times as “El Lloraero”. This is particularly beautiful in winter when its waters freeze during the night, but when the temperature rises the following day it “weeps grief-stricken” on the rocks.