Setembrino Petri

Late carboniferous palynology from the itararé subgroup (paraná basin) at araçoiaba da serra, São Paulo State, brazil

Abstract Core samples from the A‐IG‐85 well and four outcrops located in South Aracoiaba da Serra, Sao Paulo State, Brazil, have been palynologically investigated. Diverse and well‐preserved palynomorphs, including seventy‐three species of spores, monosaccate, disaccate and taeniate pollen grains, and one species of incertae sedis have been recognized. Among them, sixty species are systematically described including thirty‐four species of spores, twenty‐five pollen grains and one incertae sedis. Eleven species from the Brazilian Parana Basin are published for the first time: Granulatisporites triconvexus Staplin 1960, Dictyotriletes muricatus (Kosanke) Smith & Butterworth 1967, Vallatisporites punctatus (Marques‐Toigo) comb, nov., Cristatisporites rollerii Ottone 1989, Bascaudaspora canipa Owens 1983, Spelaeotriletes triangulas Neves & Owens 1966, Psomospora detecta Playford & Helby 1968, Florinites occultus Habib 1966, Potonieisporites barrelis Tiwari 1965, Costatascyclus crenatus Felix & Burbridge emend...

Anfíbio e palaeonisciformes da porção basal do Membro Taquaral, Formação Irati (Permiano), estado de São Paulo, Brasil

A regiao centro-leste do Estado de Sao Paulo possui boas exposicoes de sedimentos das sequencias permocarboniferas da Bacia intracratonica do Parana. Inicia-se com depositos do Grupo Itarare, Permocarbonifero, seguidos pelos da Formacao Tatui, Grupo Guata, do Eopermiano, ambos do Supergrupo Tubarao. O grupo seguinte, Passa Dois, compreende, na regiao estudada do Estado de Sao Paulo, as formacoes Irati, Eopermiano, e Corumbatai, Mesopermiano. Dois membros da Formacao Irati sao reconhecidos na regiao, Taquaral e Assistencia. A maior parte do Membro Taquaral e constituida de sedimentos siltico-argilosos, cinzentos, com laminacoes plano-paralelas. Delgados arenitos ocorrem na porcao basal do membro. Um destes arenitos, de 9,5 cm de espessura, em contato discordante com a Formacao Tatui, contem fosseis de vertebrados diversificados. A descricao de um fragmento mandibular de Palaeonisciformes, um dente isolado e um fragmento mandibular de anfibio Temnospondyli, constituem objeto desta contribuicao. Estes fosseis estao associados com outros taxa de Chondrichthyes e Osteichthyes. Fica em aberto a possibilidade de considera-los representantes de taxa da bacia do Parnaiba, Formacao Pedra do Fogo, de idade semelhante, Brasilichthys macrognathus Palaeonisciformes, e Prionosuchus plummery, Temnospondyli. Somente com fosseis em melhor estado de conservacao, seria possivel esclarecer essa questao.

Síntese dos conhecimentos e novas concepções sobre a bioestratigrafia do Subgrupo Itararé, Bacia do Paraná, Brasil

This paper critically reviews the paleontological contributions on the ltarare Subgroup of the Parana Basin, Brasil, in order to clarify its chronology and biostratigraphic successions. This unit exhibits highly heterogeneous facies associations involving glacial, periglacial and probably postglacial deposits (including marine ones). Detailed analysis ofthe vertical and horizontal distributions of the different taxa suggests an age ranging from the Late Carboniferous Westphalian through the Middle Perrnian Kungurian. Previous observation of a change of palynomorphs between the Artinskian and the Kungurian, with a first appearance of forests at the beginning of the Kungurian, is here interpreted as indicative of the end of glaciation in the Latest Artinskian

Registro de paleoniscóides na base do Membro Taquaral, Formação Irati, Permiano da Bacia do Paraná

A conglomeratic sandstone, the lowest bed of the Taquaral Member, the basal unit of the Permian Irati Formation (Passa Dois Group), in the Municipality of Rio Claro, east-central State of Sao Paulo, Brazil, contains several species of vertebrate fossils. Chondrichthyes of different orders are represented by teeth and spines, but the most abundant fossils belong to the Osteichthyes as represented by paleoniscoid scales, teeth and bone fragments. The Actinopterygii are the commonest fish remains in this unit.

Paleontology of Taquaral Member silty shale in the State of São Paulo

The Irati Formation, Permian (Cisularian) from RESUMO: A Formacao Irati, unidade permiana do Cisulariano da Brazilian Parana Basin, at the State of Sao Paulo, is divided into two members: Taquaral (basal) and Assistencia (top). The Taquaral Member exhibits two facies: basal, composed by sandstones and con- glomerates, 0.1-1 m thick, and silty shales, 5-30 m thick. The few papers dealing with the paleontology of the silty shale facies are scar- ce so the main goal of this work was to widen the knowledge of the fossils of this unit. The reported fossils herein related are acritarchs, algae, crustaceans of the genus Clarkecaris and forms taxonomically indeterminate, besides and loose vertebrate remains. Other fossils and microfossils are reported in literature but without descriptions or illustrations. The fossil record of the silty shale allowed to put forth a paleoenvironmental suggestion of a restricted low salinity body of water.

Microfossils in micrites from Serra da Bodoquena (MS), Brazil: taxonomy and paleoenvironmental implications

Microfossils present in Quaternary micrites from Serra da Bodoquena, Mato Grosso do Sul State, Brazil, are here described for the first time. The studied taxa are: a) ostracods: Candona sp., Candonopsis sp., Cyclocypris sp., Cypria sp., Cypridopsis sp., Notodromas sp., Ilyocypris sp., Cyprideis sp., Wolburgiopsis cf. chinamuertensis (Musacchio 1970), Darwinula sp. and 5 morphotypes; b) microgastropod Acrobis sp., and c) Characeae remains and gyrogonites Chara sp.. The presence of these microfossils suggests clear-water shallow lacustrine paleoenvironments and the presence of aquatic vegetation. Similarities between microfossils and the living taxa suggest possible Holocene ages for these deposits, which is in accordance with previous C(14) dates.

Estratigrafia e correlações da Bacia de Pouso Alegre, transição Neoproterozóico-Cambriano, Minas Gerais, Brasil

Remnants of Pouso Alegre and other essentially terrigenous basin deposits occur along the Ribeira Belt from Minas Gerais to Parana State. Analysis of sedimentary facies and depositional systems allowed discrimination of three stratigraphic units represented by deposits related to subaerial alluvial fans, fan-delta and proximal shelf. ln subaqueous environments these deposits were reworked by tidal currents and by normal or, eventually, storm waves. The acritarchs Soldadophycus bossii GAUCHER et al. 1996, Soldadophycus major GAUCHER 2000 e Symplassosphaeridium sp. were identified in the prodeltaic sediments, denoting participation of relatively oxygenated marine waters during sedimentation. Taking into account stratigraphic, paleontological and geochronological parameters, it is proposed that a correlation exists with the other basins along the Ribeira Belt, as well with others in Africa and South America. A palaeotectonic and palaeogeographic model was adapted to the evolution of the Westem Gondwana during the Neoproterozoic-Cambrian transition, in a scenario where cratonic blocks, tectonic collage and opening and closing of the oceans interacted. After the Varanger glacial event (ca 600 Ma) and the rising of the planet temperatures, ocean levels were also rising. Brazilides Ocean waters penetrated the southem subsiding areas af the Ribeira Belt and became a base leveI for infillings of strike-slip basins in the occidental areas of the Mantiqueira Orogen. Concomitant to these epicontinental basin infillings, sedimentation was also taking place in passive basins ofthe cratonic marginal areas. The connection between the Brazilides and Adamastor oceans allowed dispersion of similar microfossils, mainly Cloudina, in almost all basins. Convergence of cratonic blocks and closure ofthe oceans near 530 Ma allowed basin inversions, as revealed by isotopic signatures ofbasement and basin rocks.

Novos Xenacanthidae (Chondrichthyes, Elasmobranchii) da base do Membro Taquaral, Formação Irati, Permiano da Bacia do Paraná

The sandy facies at the base of the Taquaral Member, Irati Formation (earlyPermian, Artinskian), is noteworthy for its abundance of chondrichthyan fossils. However, to date just one species of Xenacanthiformes, Xenacanthus albuquerquei, has been published. Small teeth in this facies in an outcrop on the Santa Maria Homestead, Rio Claro Municipality, State of Sao Paulo, Brazil, are here assigned to two taxa, one to Xenacanthus sp. and the other as an indeterminate Xenacanthidae.

New occurrences of fossilized feathers: systematics and taphonomy of the Santana Formation of the Araripe Basin (Cretaceous), NE, Brazil

Here we describe three fossil feathers from the Early Cretaceous Santana Formation of the Araripe Basin, Brazil. Feathers are the most complex multiform vertebrate integuments; they perform different functions, occurring in both avian and non-avian dinosaurs. Despite their rarity, fossil feathers have been found across the world. Most of the Brazilian feather fossil record comes from the Santana Formation. This formation is composed of two members: Crato (lake) and Romualdo (lagoon); both of which are predominantly reduced deposits, precluding bottom dwelling organisms, resulting in exceptional preservation of the fossils. Despite arid and hot conditions during the Cretaceous, life teemed in the adjacency of this paleolake. Feathered non-avian dinosaurs have not yet been described from the Crato Member, even though there are suggestions of their presence in nearby basins. Our description of the three feathers from the Crato laminated limestone reveals that, despite the small sample size, they can be referred to coelurosaurian theropods. Moreover, based on comparisons with extant feather morphotypes they can be identified as one contour feather and two downy feathers. Despite their rareness and low taxonomic potential, fossilized feathers can offer insights about the paleobiology of its owners and the paleoecology of the Araripe Basin.

O Subgrupo Itararé, Permocarbonífero da região do médio Tietê, Estado de São Paulo: estudos em subsuperfície

The aim of the present contribution is to compare the lithologies of wells drilled by the Instituto Geologico, Secretaria do Meio Ambiente of the State of Sao Paulo (IG-SMA), for ground water. The wells were located in the middle Tiete River Valley, State of Sao Paulo. Most of these wells are 300m deep and thoroughly cored. Their sediments are referred to the Parana Basin Permo-Carboniferous Itarare Subgroup. Cretaceous intrusive rocks are also present. The wells were grouped accordingly to geographical location within the middle Tiete river valley. Four groups ofwells were considered: I- wells located as far as 30 km from the present Parana sedimentary basin border; II - wells located in the Capivari/Rafard region; III - wells located near the Tiete river margins, around the town of Tiete as well as around the Sete Fogoes and Jumirim villages; IV - one well located near Mombuca, about 10 km northwest of Capivari