The Fazaouro Formation is a fluvial-lacustrine sedimentary fill in the northeast of the Province of Lugo, at the site of the prehistoric depositional ranges of a supposed sedimentary glaciation.Christine Vergnolle (1990): "Morphologie des reliefs cotieres associés a la marge continentale nord espagnole. L´example du nord est de la Galicie".NOVA TERRA. Pags 73-81 The area consists of a valley and ridge topography, with a series of small mounts at roughly ninety degrees to each other. The Fazaouro Formation develops through the extinct and extant current basins that fill the valley of Valadouro & Foz.FRIEND, PETER F.; DABRIOT, CRISTINO J. (1996): Tertiary basins of Spain the stratigraphic record of crustal kinematics: https://core.ac.uk/download/pdf/19714245.pdf
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