1. Servicio Geológico Colombiano, Dirección de Geociencias Básicas, diagonal 53 n.o 34-53, Bogotá, Colombia
2. Vice President for South America of the Commission for the Geological Map of the World
3. Geological Survey of Brazil, SBN, Quadra 02, Bloco H, Ed. Central Brasília, 1o andar, Asa Norte, Brasília, Brazil, DF CEP: 70040-904