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Baseado en Matte 2001 e Ziegler 1990 Matte, P. (2001). "The Variscan collage and orogeny (480 ±290 Ma) and the tectonic definition of the Armorica microplate: a review". Terra Nova13: 122–128. Bibcode:2001TeNov..13..122M. doi:10.1046/j.1365-3121.2001.00327.x. Ziegler, P.A. (1990). Shell Internationale Petroleum Maatschappij BV, eds. Geological Atlas of Western and Central Europe (2 ed.). ISBN90-6644-125-9.