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Geological Society, London, Memoirs; 1990; v. 12; p. 191-196;
DOI: 10.1144/GSL.MEM.1990.012.01.17
© 1990 Geological Society of London

Silurian-Devonian Biogeography

Silurian biogeography

A. J. Boucot

Department of Zoology, Oregon State University, Corvallis, Oregon 97331-2914, USA

Silurian biogeography is characterized by a globally moderate climatic gradient, on which is superimposed a low latitude, warm region, moderate level of longitudinal provincialism. The cool to cold region Malvinokaffric Realm is bounded to the north by the warm water North Silurian Realm. The North Silurian Realm is divided into North Atlantic and Uralian-Cordilleran Regions. The North Atlantic Region, in turn, is divided into North American and European Provinces, whereas a Mongolo-Okhotsk Subprovince is recognized within the Uralian-Cordilleran Region. There is no biogeographic evidence favouring shallow water regions in the mid to high latitudes of the Northern Hemisphere. The nonmarine biogeography of the Silurian is largely unknown.