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This paper documents the occurrence of mollusk carbonate fossils in sediments of the backbarrier of the Pinheira-Guarda- -Gamboa beaches, Santa Catarina Coastal Plain, southern Brazil, in which five species of gastropods and nine of bivalves were recognized. Among the bivalves, four species were articulated, Ostrea equestris , Anomalocardia brasiliana , Lucina pectinata and Tagelus plebeius , and the last three were found in life position. Radiocarbon datings were performed on articulate and life position specimens: Lucina pectinata, indicating a conventional age of 5.260 ± 30 years BP. (calibrate age 5.620 - 5.440), Tagelus plebeius , 5.620 ± 30 years BP. (calibrate age 6.000 - 5.840) and Ostrea equestris articulate, 5.410 ± 30 years BP. (calibrate age 5.805 - 5.580), indicating the material in the middle Holocene. The topographic data gathered with precision equipment established that the top of the outcrop is 2 m above the relative sea-level. The fossil association suggests lagoon-estuarine environment subsequently filled in response to a lowering of the sea level.

Moluscos holocênicos em sedimentos lagunares associados à barreira arenosa da Pinheira-Guarda-Gamboa, Santa Catarina: implicações paleoambientais