Bernard Mamet, Maria C. Comas, Gilbert Boillot; Late Paleozoic basin on the West Galicia Atlantic margin. Geology ; 19 (7): 738–741. doi: https://doi.org/10.1130/0091-7613(1991)019<0738:LPBOTW>2.3.CO;2
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A normal-fault escarpment of the West Galicia Atlantic margin exposes an 800-m-thick section of weakly metamorphosed sandstone, dolomite, and volcaniclastic rocks. The microfauna and microflora from dolomitic layers indicate a shelf deposit of Late Devonian-early Carboniferous age. The series was probably deposited in a posttectonic basin developed on the Ossa Morena zone of the Iberian Variscides.