Ana Rita Rodrigues Ferreira (*), Heros Augusto Santos Lobo (**) & José Alexandre Jesus Perinotto (***)
(*) Institute of Geosciences and Exact Sciences (IGCE), State University of São Paulo, Avenida 24 A,1515 13506-900 Rio Claro – SP, Brazil. E-mail: ritaflogeo@gmail.com
(**) Federal University of São Carlos, Rodovia João Leme dos Santos, Km 110, SP-264, Itinga - Sorocaba, 18052-780, Brazil. E-mail: heroslobo@hotmail.com
(***) Institute of Geosciences and Exact Sciences (IGCE), State University of São Paulo, Avenida 24 A,1515 13506-900 Rio Claro – SP, Brazil. E-mail: perinoto@rc.unesp.br