O Devoniano da bacia do Paraná é caracterizado pela consolidação de duas sub-bacias, uma ao sul chamada sub-bacia Apucarana e outra ao norte chamada sub-bacia Alto Garças. Diferenças paleoambientais são notadas em ambas bacias, na sub-bacia Alto Garças as diferenças são laterais: fácies terrígenas deltáicas se estabeleceram na margem norte enquanto que fácies marinhas reinam à noroeste. Na região de Jaciara-MT, flanco noroeste da sub-bacia Alto Garças, as rochas devonianas aflorantes foram descritas apenas contendo fácies de mar aberto, no entanto aqui apresentamos novos empilhamentos estratigráficos, ambientes deposicionais e concentrações fossilíferas. Foram individualizados várias subunidades deposicionais, sendo elas da base para o topo; fácies de mar aberto com fósseis bastante representativos da fauna Malvinocáfrica (exemplares de Lingulídeos, Orbiculoidea sp., Australocoelia sp., Notiochonetes sp. e Australospirifer sp.), fácies de frente deltaica influenciada pela ação das marés, fácies de preenchimentos de vales incisos, fácies de rompimentos cíclicos de diques marginais sob planícies deltaicas, fácies fluviais, fácies transgressivas marinhas. Delimitadas por Superfície de Inundação Máxima, Superfície de Regressão Forçada e a Superfície Transgressiva.

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The class Tentaculitoidea is an extinct group composed of small carbonate coniform-shaped invertebrates, distributed from Ordovician to Devonian. This group is more often recorded to the North Hemisphere, being less recorded to South Hemisphere deposits. This study aims (i) to analyze the species found in Brazilian Devonian outcrops, in addition (ii) to investigate their paleogeographic and stratigraphic distribution. The analyzed samples, which come from Paraná, Amazonas, and Parnaíba basins, are hosted in 9 Brazilian Research Centers. It was diagnosed 12 species of tentaculitoids: Tentaculites crotalinus, Tentaculites jaculus, Tentaculites kozlowskii, Tentaculites paranaensis, Tentaculites eldredgianus, Tentaculites trombetensis, Tentaculites stubeli, Tentaculites oseryi, Uniconus ciguelii, Homoctenus katzerii, Styliolina langenii, and Styliolina clavulus. The species from Paraná Basin are different from those recorded in Amazonas and Parnaíba basins, all present distinct stratigraphic ranges (Pragian to Givetian in Paraná Basin and Eifelian to Givetian in Amazonas and Parnaíba basins).

A taxonomic review of Miocene gastropods from the Solimões Formation, Acre Basin, Brazil, from specimens collected at Cachoeira do Bandeira, Oriente, and an outcrop named Spot 04, is here presented. Three ampullariid species (Pomacea maculata, P.planorbula, Pomacea sp.), one thiarid species (Aylacostoma sp.), and one cochliopid species (Sioliella sp.) are identified for these deposits. These gastropod are known to occur in freshwaters environments, thus consolidating the hypothesis of a non-influence of brackish water on the upper Miocene deposits of the Acre Basin. The previous identification of P. maculata and Aylacostoma sp. is changed here considering biometrical analyses and shell morphological descriptions. The first report of Sioliella in this basin increases the gastropod fauna known for these strata and expands the range of this genus. Keywords: Pomacea, Aylacostoma, Sioliella, Ampullariidae, Thiaridae, Cochliopidae.