Neoproterozoic to early-cambrian volcano-sedimentary successions of the Camaquã basin, Rio Grande do Sul state, Brazil - Janikian, Liliane; Almeida, Renato Paes de; Fragoso Cesar, Antonio Romalino Santos; Martins, Veridiana Teixeira de Souza; D'Agrella Filho, Manoel Souza; McReath, Ian; Dantas, Elton Luiz (Symposium on Neoproterozoic - Early Paleozoic Events in SW-Gondwana, 2004)