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caradocian

Earth and Environmental Science Transactions of The Royal Society of Edinburgh (1)

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The Ordovician trilobite Calyptaulax brongniartii (Portlock)
E. N. K. Clarkson, R. P. Tripp
Journal:

Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 72 / Issue 4 / 1982

Published online by Cambridge University Press:

03 November 2011, pp. 287-294

Print publication:

1982
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Calyptaulax brongniartii (Portlock) from the Caradocian Bardahessiagh Formation, Pomeroy, Northern Ireland is redescribed. Equivalent material from Scottish horizons (Balclatchie and Ardwell groups) is regarded as belonging to separate populations. Campbell's system of notation is used to describe variation in the arrangement and number of lenses in the eye. The most closely related species is C. strasburgensis (Ulrich & Delo) from the Edinburg Limestone of Virginia, U.S.A.