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Book Chapter

Palaeogeographical distribution of Ordovician Radiolarian occurrences: patterns, significance and limitations

By
T. Danelian
T. Danelian
Department of Earth Sciences, University Lille 1, CNRS – UMR 8217 ‘Géosystèmes’, Bât. SN5, 59655 Villeneuve d’Ascq, France
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P. Noble
P. Noble
Department of Geological Sciences and Engineering, University of Nevada Reno, MS 172, Reno, Nevada, USA
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L. Pouille
L. Pouille
Department of Earth Sciences, University Lille 1, CNRS – UMR 8217 ‘Géosystèmes’, Bât. SN5, 59655 Villeneuve d’Ascq, France
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J. Maletz
J. Maletz
Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstr. 74-100, D-12249 Berlin, Germany
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Published:
January 01, 2013

Abstract

Over the past 15 years, significant progress has been achieved in our understanding of Lower Palaeozoic radiolarian faunas. However, description of biogeographical patterns of Ordovician Radiolaria is hampered by the paucity of known occurrences as well as possible taphonomic influences. The distribution of all known assemblages is analysed in time and space. Lower Ordovician (especially Tremadocian) Radiolaria are known from two distinct tropical localities of Laurentia. Geographical coverage is much better for the Middle Ordovician (Darriwilian). However, data are concentrated in tropical palaeolatitudes (between 30°N and 30°S). The absence of data from mid/high-latitude localities limits any biogeographical insights. In addition to this there are taphonomic and taxonomic biases. Data are also sparse for the Upper Ordovician. However, comparison between Australian and Nevadan material of Katian age shows strong similarities, suggesting the presence of a coherent tropical radiolarian bioprovince, as in the modern ocean.

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Contents

Geological Society, London, Memoirs

Early Palaeozoic Biogeography and Palaeogeography

D. A. T. Harper
D. A. T. Harper
Durham University, UK
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T. Servais
T. Servais
CNRS–Université de Lille 1, France
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Geological Society of London
Volume
38
ISBN electronic:
9781862396425
Publication date:
January 01, 2013

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