The oldest trilobites in Cambria: Early Cambrian trilobite faunas from the Llanberis Slates Formation,Gwynedd, North Wales |
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| Institution: | 1. Nant-y-felin, Pentraeth, Anglesey LL75 8YA, United Kingdom of Great Britain and Northern Ireland;2. Department of Natural Sciences, Amgueddfa Cymru-National Museum Wales, Cathays Park, Cardiff CF10 3NP, United Kingdom of Great Britain and Northern Ireland;1. 2, Batts Hill, Redhill, Surrey RH1 2DH, UK;2. Earth Sciences Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK;3. 146, Church Hill Road, Cheam, Sutton, Surrey SM3 8NF, UK;1. University of Oum el Bouaghi, Laboratory of Geological Research (LRG), B.P.12, 23000 Annaba, Algeria;2. University of Badji Mokhtar, Annaba, Laboratory of Geological Research (LRG), B.P. 12, 23000 Annaba, Algeria;1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou 570228, China;3. State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), Nanjing 210008, PR China |
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| Abstract: | Historical published works on the fossil fauna of the Llanberis Slates Formation in Gwynedd, North Wales, concentrated on the endemic trilobite Pseudatops viola (Woodward, 1888), and placed the formation towards the top of Stage 3 (Series 2) of the Cambrian chronostratigraphy.The impression given was that the fauna is not particularly diverse and fossils are rare. However, recent collecting has produced a comprehensive fauna of sponges, hyolithids and diverse arthropods including over 250 trilobite specimens from two localities of the uppermost Green Slate horizon. Among them are examples of the endemic trilobite Pseudatops viola, sufficiently well preserved to enable a reappraisal of its status. The most abundant trilobite is a form of Strenuella (cf. strenua), but the collection includes previously unrecorded eodiscoid trilobites and specimens representing unrecorded and potentially new taxa. These additions result in the most comprehensive lower Cambrian trilobite assemblage yet described from Wales, and place it in the lower part of Stage 4, Series 2 in standard global terms. |
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