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The Codó Formation presents sandstones, siltstones, bituminous shales and carbonates in discontinuous areas of the central, northwest and northeastern Parnaíba Basin. The main outcrops are found in quarries of Brejo County, Maranhão State. Sampling in two outcrops (Pedreira Faveirinha and Fazenda Perneta) allowed the discovery of a wide variety of fossils such as plants, gastropods, crustaceans, fishes and ichnofossils. These specimens of the 1 Programa de Pós-Graduação em Geociências, Universidade Federal do Rio de Janeiro, Cidade Universitária – Ilha do Fundão (RJ), Brasil; rlindoso@live.com 2 Universidade Federal do Rio de Janeiro, Cidade Universitária – Ilha do Fundão, (RJ), Brasil; ismar@geologia.ufrj.br 17 172 flora and fauna record the beginning of the South Atlantic rift phase. Among the crustaceans there is a new genus and species of Archaeoniscidae isopod; decapods which are represented by shrimps and an isolated chelae of Brachyura. This paleobiota corroborate previous inferences concerning the occurrence of lagoon environment with marine incursions to Codó Formation. Therefore, the new data will allow a better comprehension of the aquatic biota during the South Atlantic opening in Western Gondwana.

Crustáceos da Formação Codó (Bacia do Parnaíba, Brasil)