1,720,981 research outputs found
The revision of the Triassic ammonoids of the Gemmellaro collections: taxonomic and biostratigraphic implication
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Late Carnian-Early Norian ammonoids from the GSSP candidate section Pizzo Mondello (Sicani mountain, Sicily).
No full textLate Ordovician Ostracoda from Iran and their significance for palaeogeographical reconstructions
No full textThe first record of Late Ordovician ostracods from Iran comes from the lowermost part of the Shirgesht Formation east of Anarak, central Iran. The fauna comprises more than 40 species of beyrichiocopes and podocopes with a total of 17 new species and one new subspecies. Among the beyrichiocopes the Binodicopa are represented with 10 species, the Palaeocopa occur with eight species. The Anarak fauna shows relations to both allochthonous and autochthonous sediments from Thuringia as well as to Baltica with the relations being closest to the fauna of certain calcareous clasts of the glaciomarine Lederschiefer of Thuringia. The clasts have been considered as pebbles or boulders from debris flows (Schallreuter & Hinz-Schallreuter 1998), but their origin remained unclear until now. Investigation of the Anarak ostracods proved to be most significant in terms of clarifying this question. The close relations between both faunas suggest that the Thuringian clasts came from the vicinity of Gondwanian Iran
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
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
Cymbospondylus vertebrae (Ichthyosauria, Shastasauridae) from the Upper Anisian Prezzo Limestone (Middle Triassic, Southern Alps) with an overview of the chronostratigraphic distribution of the group.
No full textFour vertebral centra from the well known fossil-bearing Prezzo Limestone (Upper Anisian, Middle Triassic) of the new locality Piazza Brembana (Bergamo) are described. The four bones were originally articulated and exposed on bed surface. Despite the incompleteness of three centra due to the erosion, the fairly good preservation allowed their study and their attribution to a shastasaurid ichthyosaur; the diapophysis reaching the cranial margin of the centrum are considered as diagnostic for the genus Cymbospondylus Leidy, 1868 (Sander 1997; Maisch & Matzke 2000).
The new finding comes from an ammonoid-bearing facies, as usual for ichthyosaurs. The bio-chronostratigraphic position of Piazza Brembana bones is well constrained by ammonoids from the lowest part of the Paraceratites trinodosus Zone (Illyrian, Middle Triassic). The record of Cymbospondylus in the Southern Alps and the Germanic Basin is summarized and all the previous occurrences of the genus are bio-chronostratigraphically calibrated by using the rich ammonoid literature available. The genus spans from the Pelsonian (late Middle Anisian) to the Longobardian (Late Ladinian) and its stratigraphic distribution is strictly controlled by the development of the basins. Within the basins the distribution of the specimens seems to include relatively protected and shallow waters. Such a distribution is consistent with the mode of life of this group of ichthyosaurs, suggested by morphofunctional analysis. Cymbospondylus probably was an undulatory swimmer, better manoeuvrer but slower than their Jurassic forthcomer
The Cimmerian evolution of the Nakhlak-Anarak area, Central Iran, and its bearing for the reconstruction of the history of the Eurasian margin
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