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Book Chapter

Biogeographical patterns of Ordovician ostracods

By
Tõnu Meidla
Tõnu Meidla
1
Department of Geology, Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, Tartu 50411, Estonia
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Oive Tinn
Oive Tinn
1
Department of Geology, Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, Tartu 50411, Estonia
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Maria José Salas
Maria José Salas
2
CICTERRA (CONICET – Universidad Nacional de Córdoba), Av. Vélez Sársfield 299, 5000 Córdoba, Argentina
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Mark Williams
Mark Williams
3
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
4
British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
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David Siveter
David Siveter
3
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
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Thijs R. A. Vandenbroucke
Thijs R. A. Vandenbroucke
5
FRE 3298 du CNRS, Géosystèmes, Université Lille1, Avenue Paul Langevin – bât. SN5, 59655 Villeneuve d'Ascq, France
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Koen Sabbe
Koen Sabbe
6
Protistology and Aquatic Ecology, Department of Biology, Ghent University, Krijgslaan 281-S8, 9000 Ghent, Belgium
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Published:
January 01, 2013

Abstract

The biogeography of marine shelf ostracod genera is analysed for two Ordovician time slabs, the earliest Late Ordovician and the terminal Ordovician, that have been considered to reflect comparatively warmer and cooler global climate states, respectively. The earlier time slab is equivalent to the Nemagraptus gracilis graptolite interval (centred about 460 Ma), and defined as the total range of the eponymous species. The Hirnantian time slab comprises the Normalograptus extraordinarius and Normalograptus persculptus graptolite biozones (445.6–443.7 Ma). The ostracod dataset consists of 160 taxa from 24 early Late Ordovician localities and 86 taxa from 10 Hirnantian localities. Ordination and variation partitioning analyses show that patterns in ostracod distribution in the gracilis time slab are largely related to palaeocontinental affinity of the samples and to a lesser degree to palaeolatitude. Some decrease of provincialism can be suggested for the Hirnantian, although the ostracod dataset is limited for this interval.

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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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