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Testing Silurian palaeogeography using ‘European’ ostracod faunas

By
V. Perrier
V. Perrier
Department of Geology, University of Tatru, Institute of Ecology and Earth Sciences, Ravila 14A, 50411 Tartu, EstoniaDepartment of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
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D. J. Siveter
D. J. Siveter
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
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Published:
January 01, 2013

Abstract

The distributions of representative European and eastern North American species of the three major ostracod groups present in the Silurian independently support the standard palaeogeographical reconstructions of the ‘North Atlantic’ region for that time period. A range of assumed benthic, biostratigraphically key palaeocope and podocope ostracods show a provincial distributional pattern that characterizes a ‘European’ ostracod faunal province which reflects the amalgamated palaeoplates of Avalonia and Baltica. By contrast, representatives of the low-diversity, late Silurian, supposedly pelagic myodocope ostracod fauna from the UK, France, the Czech Republic, Sardinia and other locations globally seemingly have much wider dispersal capacity that includes, for example, trans-(Rheic)ocean locations on the Avalonia, Baltica, Armorica (West Gondwana) and Perunica palaeoplates. That there was an apparent major barrier to the migration of supposed benthic but not pelagic ostracod faunas strongly supports the notion of the presence of the Rheic Ocean and adjacent palaeocontinents. Comparable provincial and trans-oceanic distributional patterns are evident amongst Recent benthic and pelagic ostracods. The ostracod faunas of Avalonia/Baltica seemingly remained essentially distinctive, at least at species level, from those of the remainder of the Laurentian plate in the Silurian, but the reason for this is uncertain.

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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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