Funding Information: Impulso SA, in particular Ivan Cuervo Suarez, Jose Ramón Montero and Dario Gonzalez are greatly acknowledged for all logistic support in Angola. We are grateful to the PLANAGEO project, funded by the government of Angola, which supported this research, and IGEO, which allowed and encouraged the publication of this work. The authors thank Professor Celso Gomes and several retired employees o...