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Article: Ordovician trilobite distribution and geography

Special Papers in Palaeontology - No. 12 - Cover Image
Publication: Special Papers in Palaeontology
Number: 12
Thematic Volume: Organisms and continents through time: a symposium
Edited By: N. F. Hughes
Publication Date: 1973
Page(s): 235 240
Authored By: H. B. Whittington and P. Hughes
Addition Information

How to Cite

WHITTINGTON, H. B., HUGHES, P. 1973. The biogeography of some Cainozoic Ostracoda. In HUGHES, N. F. (ed.). Organisms and continents through time. Special Papers in Palaeontology12, 235–240.

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The Palaeontological Association (Free Access)


Dissimilarities between lists of trilobite families and genera from particular areas of the world have been assessed using Simpson's index. Analysis of these indices by a non-metric multidimensional scaling technique has revealed groupings which are interpreted as faunal provinces. Four such provinces are present in the Lower Ordovician; in the Caradoc certain of these provinces have merged, and in the Late Ordovician a single fauna appears to be world wide.

Assuming that a faunal province originally extended over parts of a single continental mass, an assemblage of parts of present continents is proposed to give a palaeogeographical map which differs in certain respects from that of Smith, Briden, and Drewry. Relative movements between these continental blocks is thought to have removed barriers to migration and resulted in the merging of faunal provinces.

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