Paleontología de una sección del río Corredores, formación Curré, Mioceno, Costa Rica

In the Corredores river a sequence of fine to coarse sandstones crops out. The beds are subvertical trending N-S. The rocks are greenish gray in color and contain 43 species of mollusks, crustaceans, fragments of echinoderms and trace fossils (Thalassinoides, Oichnus) of very good preservation. This sequence is correlated with the Curre Formation. Based on planktonic forams dated as Early Miocene (N4-N5 zones) suggesting a broadening of the age of the Formation to encompass all Miocene. Mollusks are the group with greater biodiversity, presenting around 25 species of gastropods and 18 of bivalves. A new species was described: Nuculana (Saccella) corredoresnsis . The bivalves in their majority presents conjugated shells and some species (Nuculana, Ostrea) are in vital position in defined levels mainly of Oysters. Most of the gastropods are carnivorous fed on the abundant fauna of bivalves (some with Praedicnia ichnofossils: Oichnus isp.). The crustaceans are represented by crabs exoskele - tons that constitute shells quite complete and isolate pincers. The echinoderms are found as isolate plates of Echinoidea and spines. Ichnofossils are represented by Thalassidoides isp. and Oichnus isp. This deposit is interpreted as a vital lipostrate biofacies, constituted by a basic biocoenosis, with organisms that lived in the sublittoral zone and by taphocoenosis of deeper water organisms as tempestitic events.