Abstract
Palynological evidence on the distribution of fossil marine microplankton corroborates presumed provincialism during the late Early Ordovician. Closely similar acritarch assemblages and other palynomorphs, namely cryptospores, were recovered from coeval sedimentary sequences within a sedimentary belt rimming the northern margin of Gondwana. A barrier dividing the cool, high-latitude Perigondwanan region from the warm water Baltoscandinavia and Laurentia may be inferred from the spatial distribution pattern of acritarch paleocommunities. Provincialism of the organic-walled microfossils of earliest and latest Ordovician (Tremadocian, Ashgillian) age is less evident. The Coryphildium bohemicum acritarch bioprovince of Arenigian-Llanvirnian age, which extends from northwestern Argentina to the Yangtze Paraplatform, is here proposed.
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