1,721,067 research outputs found
Magnetostratigraphy of the Punta Grohmann section (Dolomites, Italy): improving the chronology of the Ladinian/Carnian boundary
No full textWe provide the magnetostratigraphy of the Ladinian/Carnian Punta Grohmann stratigraphic section (Dolomites, Italy), calibrated with U Pb ages from the literature (237.58 0.04 Ma; 237.68 0.05 Ma). The FO of ammonoid Zestoceras lorigae, the base of the vigens-densus palynomorphs Zone, and sequence stratigraphy suggest a Carnian age for the upper part of the section, which has been confirmed by the magnetostratigraphic correlation between Punta Grohmann and Prati di Stuores (Carnian GSSP). Additional magnetostratigraphic correlation between Punta Grohmann and key time-calibrated Ladinian–Carnian sections from the literature (e.g., Mayerling, Seceda, Rio Nigra) lead to a more precise age of the Carnian base (about 236.5 Ma) and to a better definition of the Middle–Late Triassic Geomagnetic Polarity Time Scale
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Global Carboniferous brachiopod biostratigraphy
No full textWe present an updated look at Carboniferous brachiopod biozonation from most of the world framedinto a revised Carboniferous palaeogeography, based on a selection of the literature published on Carboniferousbrachiopods since the nineteenth century. The biostratigraphic significance of the most important brachiopodtaxa is synthesized in seven geographical correlations.The Mississippian is characterized by rich brachiopod faunas, with widespread taxa with a good potential forglobal correlation, such as Rugosochonetes, Delepinea, Buxtonia, Antiquatonia, Spinocarinifera, Marginatia,Fluctuaria, Ovatia, Rhipidomella, Lamellosathyris, Unispirifer, Tylothyris and Syringothyris.From the mid-Visean to the late Serpukhovian, taxa of gigantoproductidines are biostratigraphically significant,and occur everywhere except South America and Australia, which remain as distinct faunal successions formost of the period. A major turnover occurs at the beginning of the Pennsylvanian, characterized by a higherdegree of provincialism. Pennsylvanian brachiopod faunas are diverse in China, Russia and North America, butotherwise they are less developed and are characterized mostly by endemic taxa, hampering long-distance correlation.An exception is the rapid diversification of taxa of the Choristitinae, which were widespread from theBashkirian to the Moscovian, allowing long-distance correlation.Fil: Angiolini, Lucia. Università degli Studi di Milano; ItaliaFil: Cisterna, Gabriela Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; ArgentinaFil: Mottequin, Bernard. Royal Belgian Institute of Natural Sciences; BélgicaFil: Shen, Shu-Zhong. Nanjing University; ChinaFil: Muttoni, Giovanni. Università degli Studi di Milano; Itali
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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