Notes on the Trilobite Fauna of the Middle Cambrian of the St. Tudwal's Peninsula (Carnarvonshire)

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Abstract
Introduction In a previous paper on the stratigraphy of the St. Tudwal's Peninsula (Carnarvonshire), an account has been given of the succession and lithology of the Cambrian rocks there exposed, together with approximate determinations of their contained fossils. By far the greater number of these occur in the beds named the Upper Caered Mudstones and the Nant-pig Mudstones, both of which are of Middle Cambrian (Paradoxidian) age. It had been my intention to devote further time to the collection of fossils from these beds, in the hope of establishing subdivisions of zonal value and of throwing fresh light upon British Middle Cambrian faunas, which (at the time when my paper was written) stood in great need of detailed stratigraphical work. The situation has, however, been entirely changed by the remarkable discoveries of Mr. Illing at Nuneaton. He has shown that the beds formerly known as the Lower Oldbury Shales, renamed by him the Abbey Shales, contain a succession of Middle Cambrian horizons which teem with beautiful fossils, in a state of preservation far in advance of anything hitherto recorded from the Middle Cambrian of the British Isles. Not only are these Abbey-Shale fossils more varied, more numerous, and individually much better preserved than those from the St. Tudwal's Peninsula, but a comparison of the two renders it certain that the fossiliferous succession is far more complete at Nuneaton, and includes both lower and higher horizons than those found in Carnarvonshire. Under these circumstances, it does not seem that further investigation

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