Abstract
Dinoflagellate cysts assigned to the subfamily Protoperidinioideae are frequently recorded in Miocene coastal deposits, and their relative abundance is directly related to primary productivity and favorable post depositional conditions. However, these microfossils are poorly studied in Brazilian Miocene sequences. This paper presents the results of a palynological study on 18 samples obtained from the core CBM001-ST-RS drilled in the coastal plain of southernmost Brazil, related to the Cidreira Formation, Pelotas Basin. Forty-nine taxa are identified, 46 dinoflagellate cysts, two genera of chlorophyte algae, and one acritarch species. Overall, the samples are characterized by large numbers of Spiniferites spp. and Brigantedinium spp., as well as a significant richness of the subfamily Protoperidinioideae. Several species of dinoflagellate cysts indicate a Miocene age, but the record of Sumatradinium hamulatum and Quadrina? condita restricts the age of the interval analyzed to the middle Miocene. Both the PMI and the P/G palynological indices indicate a neritic marine environment and moderate primary productivity, respectively.
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