2017-05-152017-05-151979-10-17FARIA JUNIOR, Luis Ercílio do Carmo. Estudo sedimentológico da formação Pedra de Fogo-Permiano: Bacia do Maranhão. 1979. 70 f. Dissertação (Mestrado) - Universidade Federal do Pará, Centro de Geociências, Belém, 1979. Programa de Pós-Graduação em Ciências Geofísicas e Geológicas.https://repositorio.ufpa.br/handle/2011/8387The Pedra de Fogo Formation of the Early-Middle-Permian in the Maranhão Basin is characterized by a ciclic sedimentation with fine sandstone intercalated with siltstones, shales and carbonatic banks which have abundant sílex beds and concretions. On surface this unit is divided into three members named Basal' Silex, Middle and Upper, Trisidela. Silicified oolites, pellets, coquinas with ' fish remains, stromatolitic beds and wood remains are found in the Pedra de Fogo. Formation sediments. The lithologies indicate a shallow, restricted, marine environment ' with two transgressions phases separated by a regression phase. The lateral facies changes reflect the sedimentary dynamism and suggest that the marine environment progressed from a transitional, deltaic to shallow neritic one. The main source areas of the clastic sediments and some of the sílica are, located in the northestern to the southern parts of the Basin and derived ' from the Borborema and São Francisco Provinces rockes. The Tocantins and. Tapajós Provinces to the west and southest have supplied material also. The climate during the Pedra de Fogo sedimentation has varied from moderate to arid as a consequence of the northward South American continent slow migration. The Maranhão had tectonic stability during the Permian. The marine in cursions took place from west, through the Amazonas Basin. Besed on the cyclothemes thickness, it seems that the Pedra de Fogo sedimentation occured from the water level oscilations in the Basin, which had also motivated the transgressions and regressions phases and whose origin should be related to the climatic changes during the Permian time.Acesso AbertoSedimentologiaGeologia estratigráficaPetrologiaPermianoFormação Pedra de FogoBacia do MaranhãoEstudo sedimentológicoDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::ESTRATIGRAFIA