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A precise worldwide correlation of early Ordovician graptolite sequences

Published online by Cambridge University Press:  01 May 2009

R. A. Cooper  and
K. Lindholm
R. A. Cooper
Affiliation:
New Zealand Geological Survey, P.O. Box 30368, Lower Hutt, New Zealand
K. Lindholm
Affiliation:
Department of Historical Geology and Palaeontology, Lund University, Sölvegatan 13, S-223 62 Lund, Sweden
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Abstract

Fourteen early Ordovician (Tremadoc-Llandeilo) graptolite sequences from around the world are precisely (infrazonally) correlated, based on the stratigraphic ranges of 130 species and species groups. The composite standard sequence (CSS) of graptolites has been determined from the six best regional sequences by a nonparametric graphic correlation. Two data sets were selected: one comprised first appearance events of 103 taxa, the other, first and last appearance events of 45 taxa. The results of the two runs accord well and reveal respectively 66 and 73 successive bioevents in early Ordovician time. Event spacing averages 0.7–0.8 Ma and enables fine subdivision, correlation and homotaxial testing for diachroneity. The strong correlation between each of the six regional sequences and the CSS indicates the high level of accordance among graptolite successions around the world.

Type
Articles
Information
Geological Magazine , Volume 127 , Issue 6 , November 1990 , pp. 497 - 525
Copyright
Copyright © Cambridge University Press 1990

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