Devonian Tentaculitoids from Brazil: extinction and stratigraphic distribution

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).

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Análise da transportabilidade de restos esqueletais do Bone Bed de Pterossauros de Cruzeiro do Oeste, Grupo Caiuá, Cretáceo da Bacia Sedimentar do Paraná / Analysis of the transportability of skeletal remains of the Bone Bed of Pterossauros of Cruzeiro do Oeste, Caiuá Group, Cretaceous of the Sedimentary Paraná Basin

Saúde e meio ambiente revista interdisciplinar ◽

10.24302/sma.v7i2.1679 ◽

2018 ◽

Vol 7 (2) ◽

pp. 74

Author(s):

Morgana Denk Wantowsky ◽

Luiz Carlos Weinschütz

Keyword(s):

Skeletal Remains ◽

Hydraulic Transport ◽

Hydraulic Flow ◽

The North ◽

Wide Range ◽

Paraná Basin ◽

Parana Basin ◽

East West ◽

Organic Remains ◽

The Way

A descrição da nova espécie de pterossauro Caiuajara dobruskii abriu caminho para o desenvolvimento de uma ampla gama de estudos paleontológicos, entre eles a análise tafonômica. Tal análise representa um estudo dos processos que ocorrem desde a morte do organismo até a incorporação final dos seus restos orgânicos nas rochas. Buscando interpretar características tafonômicas relacionadas ao transporte hidráulico, foi utilizado peças do acervo do Museu da Terra e da Vida – UnC numeradas como CP.V 1001a, CP.V 1001b, CP.V 1023 e CP.V 1024.Os ossos encontrados nessas peças foram identificados e nomeados, na sequência utilizando as informações contidas no banco de dados do Cenpáleo, foi possível posicionar as peças espacialmente. Permitindo que a angulação dos ossos em relação ao norte fosse determinada. Os valores obtidos foram organizados em diagramas de roseta para indicar o direcionamento e sentido dos restos esqueletais. Os diagramas de roseta mostraram direcionamentos preferenciais entre os quadrantes SE e NW para as peças CP.V 1001a e CP.V 1001b, e direcionamento preferencial NE e SW para a peça CP.V1024. Diferença que pode ser justificada pelos diferentes níveis estratigráficos em que as peças foram coletadas. De maneira geral os dados podem ser correlacionados a um fluxo hidráulico Leste – Oeste para as peças CP.V 1001a e CP.V 1001b e Nordeste para a peça CP. V 1024.ABSTRACTThe description of the new pterosaur species Caiuajara dobruskii opened the way for the development of a wide range of paleontological studies, including taphonomic analyzes. This analysis represents a study of the processes that occur from the death of the organism to the final incorporation of its organic remains in the rocks. In order to interpret taphonomic characteristics related to hydraulic transport, pieces of the Caiuá Sandstone housed at the collection of the Museum of Earth and Life - UnC numbered as CP.V 1001a, CP.V 1001b, CP.V 1023 and CP.V 1024. The bones found in these pieces were identified and named. In the sequence using the information contained in the Cenpaleo database, it was possible to position the pieces spatially. It allowed the angulation of the bones in relation to the north to be determined. The values obtained were organized in rosette diagrams to indicate the targeting and direction of the skeletal remains. The rosette diagrams showed preferred directions between the SE and NW quadrants for the pieces CP.V 1001a and CP.V 1001b, and preferential targeting NE and SW for the piece CP.V1024. Difference that can be justified by the different stratigraphic levels in which the pieces were collected. In general, the data can be correlated to an East - West hydraulic flow for pieces CP.V 1001a and CP.V 1001b and Northeast for the piece CP. V 1024.

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Late Paleozoic (Gondwanan) ostracodes in the Corumbataí Formation, Paraná Basin, Brazil

Journal of Paleontology ◽

10.1017/s0022336000042293 ◽

1990 ◽

Vol 64 (1) ◽

pp. 116-128 ◽

Cited By ~ 7

Author(s):

I. G. Sohn ◽

A. C. Rocha-Campos

Keyword(s):

Tidal Flat ◽

Sao Paulo ◽

Late Paleozoic ◽

Late Permian ◽

The North ◽

Lower Gondwana ◽

Low Diversity ◽

Paraná Basin ◽

Parana Basin ◽

Stratigraphic Range

An abundant, low diversity, poorly preserved Late Permian ostracode faunule was recovered from residues of dissolved limestone. Collections are from the Corumbataí Formation exposed near Conchas, about 194 km northwest of São Paulo and from a borehole into the upper part of the Corumbataí Formation. Although the Corumbataí Formation has been interpreted mainly as a restricted marine-transitional offshore/shoreface and tidal-flat deposit, the ostracodes represent nonmarine taxa. Steinkerns ofCandona, Cypridopsis?, Darwinula?, Gutschickia?, and genus unknown are illustrated in open nomenclature; they indicate freshwater influences. Several Permian marine genera from lower Gondwana (=Carboniferous-Permian), illustrated in open nomenclature, show that their steinkerns would differ from those illustrated here from Brazil. Although the Late Permian drainage from the north into the Paraná Basin has been considered to have been meager, rivers from the north must have supplied sufficient water to freshen the margins of the basin so that immigration of nonmarine ostracodes occurred.Based on the similarity of the distinctive lateral outline of the Brazilian specimens to the nonmarine living genusCandona, the stratigraphic range of the genus is tentatively extended into the Permian.

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A new record of early Silurian land plant spores from the Paraná Basin, Paraguay (Malvinokaffric Realm)

Geological Magazine ◽

10.1017/s0016756800008463 ◽

1992 ◽

Vol 129 (6) ◽

pp. 741-752 ◽

Cited By ~ 16

Author(s):

Jane Gray ◽

A. J. Boucot ◽

Yngve Grahn ◽

Gregory Himes

Keyword(s):

Land Plant ◽

Conclusive Evidence ◽

Frequency Data ◽

Southern Brazil ◽

The North ◽

Size Frequency ◽

Assemblage Zone ◽

Paraná Basin ◽

Parana Basin ◽

Microfossil Assemblage

AbstractThe first conclusive evidence for Silurian rocks in the Paraná Basin, Brazil, was reported in 1985. This evidence was based on organic-walled microfossils, principally spore tetrads, and associated phytoplankton (‘acritarchs’ and prasinophytes), the first recovered from the Vila Maria Formation on the northeastern rim of the Basin. The spore assemblage was typical of Gray's Microfossil Assemblage Zone I; size-frequency data for the tetrads suggested an early Silurian (early Llandovery; Rhuddanian) age. We now document a new MA Zone I occurrence of spore tetrads together with a few single trilete spores, from the southwestern rim of the Paraná Basin, Paraguay. The single spores are among the earliest known to have normally dissociated from a tetrahedral tetrad. Size-frequency data for the tetrads suggest a late Llandovery, pre-C5(mid-Telychian) age. These spores, together with phytoplankton and chitinozoans, were recovered from beds laterally equivalent to the Vargas Peña Shale at the type locality from which Llandovery diplograptids and monograptids are known. Llandovery age rocks on the southwesternandnortheastern borders of the Paraná Basin,c. 1400 km apart, suggest that early Silurian rocks were extensively distributed throughout southern Brazil and adjacent Paraguay. Close conformity between the age reference obtained with graptolites and spore tetrads again demonstrates the stratigraphic utility of early Silurian spores in providing reliable age determinations for otherwise unfossiliferous rocks. Spore tetrad assemblages available from the Malvinokaifric Realm (South America, Africa, Arabia) represent a distinct phytogeographic unit contrasted with spore tetrad assemblages from the North Silurian Realm of North America and parts of Europe.

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