Based on new radiometric data, a Pre-Cañadas volcanic building of 3.5-3.0 Ma has been defined. This new building is mainly compared of basaltic rock cropping out in several gorges to the S of Cañadas Building, inside of the "Pared de las Cañadas", "Boca de Tauce", and "La Grieta" and "La Angostura" valleys
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