9 research outputs found

    Corales Tabulados del Devónico Inferior de Argentina y Bolivia: Estado de la cuestión

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    p. 143-148Los corales tabulados dev√≥nicos de Argentina y Bolivia, y muy especialmente los g√©neros Favosites y Pleurodictyum, han sido citados de forma reiterada en la literatura paleontol√≥gica. Estas atribuciones, a menudo muy antiguas, no pueden ser aceptadas sin un an√°lisis detallado del material incluyendo, en el caso de Pleurodictyum, el examen de la cara proximal de la colonia. En los √ļltimos a√Īos se han realizado varios estudios modernos de estos corales, con descripciones, figuraciones y discusiones que han permiti-do reconocer una fauna de tabulados m√°s diversa y abundante de lo que sospech√≥ en un principio. Este trabajo pretende dar a conocer el estado actual de conocimientos sobre estos corales, enfatizan-do las informaciones aportadas por su estudio e indicando los futuros trabajos que, sobre esta tem√°tica, convendr√≠a acometer.S

    New data on the Silurian-Devonian paleontology and biostratigraphy of Bolivia

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    P. 269-314In order to precisely establish the bio- and chronostratigraphic position of several levels of the Silurian‚ÄďDevonian succession of Bolivia, with respect to the International Time Scale, additional Silurian and Devonian localities belonging to the Eastern Cordillera and the Interandean Zone areas have been recently revised and sampled, both for macrofossils and palynomorphs. Specifically, the localities are √Ďu√Īumayani, and Muruhuta from the late Silurian‚Äďearly Devonian time interval. Correlations with other fossiliferous localities are discussed, namely Huacallani and Rumicorral.S

    Field trip: Palaeozoic echinoderms from northern Spain

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    p. 209-288Spain contains some of the most extensive and fossiliferous Palaeozoic outcrops in Europe, including echinoderm faunas that are internationally signpalaificant in terms of systematics, paleoecology and palaeobiogeography. This field trip will review some of the most remarkable Palaeozoic localities in North Spain. It will be divided into two different but related geological and geographical areas, the Cantabrian Zone in northern Spain and its southeastern prolongation, known as the Iberian ChainsS

    Considera√ß√Ķes Paleobiogeogr√°ficas dos Corais e Briozo√°rios do Devoniano Brasileiro

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    Os corais e briozo√°rios devonianos brasileiros est√£o registrados nas bacias do Amazonas e Paran√°, respectivamente nas forma√ß√Ķes Maecuru e Ponta Grossa. Na regi√£o amaz√īnica s√£o duas esp√©cies de corais e oito de briozo√°rios, enquanto na regi√£o sul e sudeste a ocorr√™ncia de ambos os grupos est√° limitada a cita√ß√Ķes gerais. A baixa diversidade espec√≠fica e o pequeno tamanho das popula√ß√Ķes relacionam-se com limita√ß√Ķes ecol√≥gicas, filogen√©ticas e preservacionais, al√©m do n√ļmero insuficiente de pesquisas espec√≠fica

    Tabulate Corals after the Frasnian/Famennian Crisis: A Unique Fauna from the Holy Cross Mountains, Poland

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    Famennian tabulate corals were very rare worldwide, and their biodiversity was relatively low. Here we report a unique tabulate fauna from the mid- and late Famennian of the western part of the Holy Cross Mountains (Kowala and Ostrówka), Poland. We describe eight species (four of them new, namely ?Michelinia vinni sp. nov., Thamnoptychia mistiaeni sp. nov., Syringopora kowalensis sp. nov. and Syringopora hilarowiczi sp. nov.); the whole fauna consists of ten species (two others described in previous papers). These corals form two assemblages-the lower, mid-Famennian with Thamnoptychia and the upper, late Famennian with representatives of genera ?Michelinia, Favosites, Syringopora and ?Yavorskia. The Famennian tabulates from Kowala represent the richest Famennian assemblage appearing after the F/F crisis (these faunas appear some 10 Ma after the extinction event). Corals described here most probably inhabited deeper water settings, near the limit between euphotic and disphotic zones or slightly above. At generic level, these faunas show similarities to other Devonian and Carboniferous faunas, which might suggest their ancestry to at least several Carboniferous lineages. Tabulate faunas described here represent new recruits (the basin of the Holy Cross mountains was not a refuge during the F/F crisis) and have no direct evolutionary linkage to Frasnian faunas from Kowala. The colonization of the seafloor took place in two separate steps: first was monospecific assemblage of Thamnoptychia, and later came the diversified Favosites-Syringopora-Michelinia fauna

    Check List of Fossil Invertebrates Described from the Middle Devonian Rocks of the Thedford-Arkona Region of Southwestern Ontario

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    81-132http://deepblue.lib.umich.edu/bitstream/2027.42/48319/2/ID160.pd

    <i>Thamnoptychia mistiaeni</i> sp. nov. from Kowala Quarry, lithological sets J or K, Upper Famennian.

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    <p>(A) Transverse section through a branch. (B) Longitudinal section through a branch. Specimen GIUS 3619 KF 049, holotype. (C) External view of a branch. Specimen GIUS 3619 KF 090a. (D) Longitudinal section through a branch. Specimen seen in dark field, GIUS 3619 KF 090b.</p

    <i>Thamnoptychia mistiaeni</i> sp. nov. from Kowala Quarry, lithological sets J or K, Upper Famennian.

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    <p>(A) External view of a branch. Specimen GIUS 3619 KF 090c. (B) External view of a branch. Specimen GIUS 3619 KF 090d.</p

    Heterocorals <i>Oligophylloides</i> co-occurring with <i>Thamnoptychia mistiaeni</i> sp. nov.

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    <p>Transverse sections through branches. Kowala Quarry, lithological sets J or K, Upper Famennian.</p
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