Abstract
The Derfel Limestone, a thin basal member of the Lower Bala of the Arenig-Bala district, north Wales, is exposed only in three localities but has yielded a rich fauna of brachiopods, trilobites, bryozoans and crinoids. A systematic study of the two former phyla shows that the brachiopods are represented by eighteen genera (one, Salopia , is described as new), including nine new species and subspecies, and the trilobites by nine genera. It has previously been believed that the fauna represented a Scoto-Appalachian intrusion into the independent Anglo-Welsh faunal province. But the brachiopods especially are not typical of contemporary Scottish or American sedentary benthos and are better described as a native association dominated by migrants from the east Baltic together with an association of clitambonitids, leptestiinids and productorthinids possibly of Russian origin.
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Schedule a callMore From: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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