Chemostratigraphy of the Tamengo Formation (Corumbá Group, Brazil): a contribution to the calibration of the Ediacaran carbon-isotope curve - Boggiani, Paulo César; Gaucher, Claudio; Sial, Alcides Nobrega; Babinski, Marly; Simon, Cyntia Moraes; Riccomini, Claudio; Ferreira, Valderez; Fairchild, Thomas R. (Precambrian Research, 2010)