Fernando Lopes, Universidade do Vale do Rio dos Sinos, São Leopoldo, Brazil, Karlos Guilherme Diemer Kochhann, Unisinos University, São Leopoldo, Brazil, Richard D Norris, Scripps Institution of Oceanography, La Jolla, CA, United States, Jairo F Savian, IAG-USP, Sao Paulo, Brazil and Gerson Fauth, Unisinos University, itt Fossil - Instituto Tecnológico de Micropaleontologia, São Leopoldo, Brazil