Integrated correlation of the vendian to cambrian Arroyo del Soldado and Corumbá groups (Uruguay and Brazil): palaeogeographic, palaeoclimatic and palaeobiologic implications - Gaucher, Claudio; Boggiani, Paulo César; Sprechmann, Peter; Sial, Alcides Nobrega; Fairchild, Thomas R. (Precambrian Research, 2003)