The paleocene travertine system of the Itaboraí basin, southeastern Brazil - Sant'anna, Lucy Gomes; Riccomini, Claudio; Rodrigues-Francisco, Benedicto Humberto; Sial, Alcides Nobrega; Carvalho, Marcio da Silveira; Moura, Cândido Augusto Veloso (Journal of South American Earth Sciences, 2004)