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Book Chapter

Biogeography of Ordovician and Silurian gastropods, monoplacophorans and mimospirids

By
Jan Ove R. Ebbestad
Jan Ove R. Ebbestad
Museum of Evolution, Uppsala University, Norbyvägen 16, SE–752 36 Uppsala, Sweden
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Jiří Frýda
Jiří Frýda
Czech Geological Survey, Geologicka 6, 150 00 Prague, Czech Republic
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Peter J. Wagner
Peter J. Wagner
Department of Paleobiology, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7012, USA
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Radvan J. Horný
Radvan J. Horný
Department of Palaeontology, National Museum, Václavské náměstí 68, 115 79 Prague 1, Czech Republic
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Mare Isakar
Mare Isakar
The Museum of Geology of the University of Tartu, Vanemuise 46, 51014 Tartu, Estonia
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Sarah Stewart
Sarah Stewart
National Museum of Scotland, Chambers Street, Edinburgh EH1 1JF, UK
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Ian G. Percival
Ian G. Percival
Geological Survey of New South Wales, WB Clarke Geoscience Centre, 947–953 Londonderry Road, Londonderry, NSW 2753, Australia
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Verònica Bertero
Verònica Bertero
CICTERRA-CONICET, Centro de Investigaciones Paleobiológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Velez Sarsfield 299, X5000JJC Córdoba, Argentina
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David M. Rohr
David M. Rohr
Department of Earth and Physical Sciences, Sul Ross State University, Alpine, TX 79832, USA
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John S. Peel
John S. Peel
Department of Earth Sciences (Palaeobiology), Uppsala University, Villavägen 16, SE–752 36 Uppsala, Sweden
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Robert B. Blodgett
Robert B. Blodgett
2821 Kingfisher Drive, Anchorage, AK 99502, USA
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Anette E. S. Högström
Anette E. S. Högström
Tromsø University Museum, Natural Sciences, N-9037 Tromsø, Norway
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Published:
January 01, 2013

Abstract

The biogeographical distribution of Ordovician and Silurian gastropods, monoplacophorans and mimospirids has been analysed on a generic level. The dataset contains 334 genera and 2769 species, yielding 1231 records of genera with 2274 occurrences worldwide. There is a bias towards eastern Laurentia, Baltica and Perunica records. Some 53.1% of the records are Ordovician. The study demonstrates that these molluscs are well suited to being used to improve understanding of Ordovician and Silurian biogeographical provinciality. Specific points are that: a Lower Ordovician assemblage is evident in Laurentia; the fauna of the Argentinean Precordillera is Laurentian until the Darriwilian, when taxa are shared with North China; Late Silurian gastropods from the Alexander terrane (SE Alaska) are unknown in Laurentia, but support a rift origin of this terrane from NE Siberia; Perunica, Ibero-Armorica and Morocco cluster together throughout the Ordovician but Perunica and Morocco are closer; Darriwilian–Sandbian deep-water Bohemian taxa occur in Baltica; a Laurentian–Baltica proximity is unsupported until the Silurian; Siberia clusters with North China and eastern Laurentia during the Tremadocian–Darriwilian; during the Gorstian–Pridoli Siberia clusters with the Farewell and Alexander terranes; North China may have been close to Laurentia and the Argentinean margin of Gondwana; and the affinity of Tarim taxa is problematic.

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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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