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Correa-Martínez, A.M., Rodríguez, G., Arango, M.I. and Zapata-García, G. 2019. Petrography, geochemistry and U-Pb geochronology of volcanic and pyroclastic rocks of the Noreán Formation in the NW of the Santander Massif, Colombia. Boletín de Geología. 41, 1 (Jan. 2019), 29–54. DOI:https://doi.org/10.18273/revbol.v41n1-2019002.