. Bulletin of the British Museum (Natural History), Geology. R. A. FORTEY & R. M. OWENS. Fig. 6 Map showing proposed stratotype for the base of the Whitlandian Stage at Cwm yr Abbey, east of Carmarthen (see Fortey & Owens 1978: 231, fig. 3). boundary includes M. rhyakos and abundant Porterfieldia punctata and that above it Ogyginus hybridus, F. radix and orthoconic nautiloids. The higher part of the Whitlandian, which incorporates the Gymnostomix gibbsii Biozone, is represented in the Carmarthen area by the upper part of the Afon Ffinnant Formation which contains abundant G. gibbsii an
. Bulletin of the British Museum (Natural History), Geology. R. A. FORTEY & R. M. OWENS. Fig. 6 Map showing proposed stratotype for the base of the Whitlandian Stage at Cwm yr Abbey, east of Carmarthen (see Fortey & Owens 1978: 231, fig. 3). boundary includes M. rhyakos and abundant Porterfieldia punctata and that above it Ogyginus hybridus, F. radix and orthoconic nautiloids. The higher part of the Whitlandian, which incorporates the Gymnostomix gibbsii Biozone, is represented in the Carmarthen area by the upper part of the Afon Ffinnant Formation which contains abundant G. gibbsii and O. hybridus, but the most complete and fossiliferous section is at Pwlluog, Whitesand Bay, in the Penmaen Dewi Formation. The trilobite fauna of this stage in its type development is characterized by the trinucleid genera Furcalithus and Gymnostomix, which are restricted to it, the asaphids Ogyginus hybridus and Bohemopyge scutatrix and the shumardiid Shumardia gadwensis. The graptolite fauna is small, and is dominated by Azygo- graptus. Fennian Stage The base is defined in the lane exposure opposite the bridge leading to Cwm-banau, north of Whitland (SN 2123 1862), at the base of the Cwmfelin Boeth Formation. Strata on either side of the boundary have yielded few fossils in the immediate vicinity, but the Whitland Abbey Member of the Colomendy Formation has yielded a typical G. gibbsii Biozone fauna at nearby Whitland Abbey. The Cwmfelin Boeth Formation carries a distinctive (allochthonous) fauna of articulate brachiopods, Asaphellus and Cyclopyge grandis grandis. Apart from the turbidites of the Cwmfelin Boeth Formation, much of the stage in its type development in the Whitland area is represented by sediments of offshore origin which carry a mixed graptolite-trilobite Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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