The Cantabrian Zone (CZ) conforms the Variscan foreland fold and thrust belt, and is located in the core of the Ibero-Armorican arc of NW-Iberia. Deformation is characterized by thin-skinned thrusts and associated folds that accommodate frontal and lateral ramps. The Villazón-Reigada Syncline is located in the Somiedo Nappe, the most internal nappe of the CZ….
The Cantabrian Zone (CZ) conforms the Variscan foreland fold and thrust belt, and is located in the core of the Ibero-Armorican arc of NW-Iberia. Deformation is characterized by thin-skinned thrusts and associated folds that accommodate frontal and lateral ramps. The Villazón-Reigada Syncline is located in the Somiedo Nappe, the most internal nappe of the CZ. It is associated with a paired fault-propagation anticline, and is characterised by an open interlimb angle and a subvertical axial plane. The erodibility of the Silurian shales of the Formigoso Fm. has allowed the syncline to be perfectly highlighted in the landscape by the Cambro-Ordovician quartzarenites of the Barrios Fm., as it can be appreciated in the picture. As an scale, the height of the left-hand side mountain over La Barca Reservoir is about 300 m.
Reference: Gutiérrez-Alonso, G. (1992). The Narcea Antiform and its relation with the Western Nappes of the Cantabrian Zone. PhD Thesis. University of Oviedo.
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