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Trilobites from the Ordovician Ardwell Group of the Craighead Inlier, Girvan district, Scotland

Published online by Cambridge University Press:  03 November 2011

R. P. Tripp
R. P. Tripp
Affiliation:
R. P. Tripp, British Museum (Natural History), Cromwell Road, London SW7 5BD, England.
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Abstract

All trilobites known from the Ardwell Group, Craighead Inlier, Girvan district are listed and frequencies recorded. Encrinuroides lapworthi n. sp. from the Sericoidea Mudstones, and Bumastoides fornax n. sp. from the Kiln Mudstones, are described. The Sericoidea Mudstones constitute a deeper water interlude in the complex succession which comprises the Craighead Limestone Formation; graptolites from this horizon indicate low Dicranograptus clingani zone. The closest resemblance of the trilobite assemblage as a whole is to faunas of Trenton age in North America. The occurrence of forms allied to Boda Limestone (Ashgill) species suggests that these are long-ranging, carbonate associated, trilobite stocks.

Keywords

cranidiumfree cheekrostral platehypostomethoracic segmentpygidiummuscle scargraptoliteNorth American fauna.
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 71 , Issue 3 , 1980 , pp. 147 - 157
Copyright
Copyright © Royal Society of Edinburgh 1980

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