. Bulletin of the British Museum (Natural History), Geology. ARENIG IN SOUTH WALES 283 â â ifcsfc' *. Fig. 135 Scandent graptoloids from the late Arenig to earliest Llanvirn of south Wales, a, Pseudotri- gonograptus ensiformis (Hall 1865), Upper Arenig, Fennian, B. rushtoni Biozone, Pontyfenni Forma- tion, loc. 23, x 3, Q5104. b, Glossograptus acanthus Elles & Wood 1908, latest Arenig, Fennian, D. levigena Biozone, Llanfallteg Formation, loc. 52J, x 2, Q5171. c, f, h, k, 'Glyptograptus austro- dentatus Harris & Keble 1932, Llanfallteg Formation; c, large specimen widening slowly to mor
. Bulletin of the British Museum (Natural History), Geology. ARENIG IN SOUTH WALES 283 â â ifcsfc' *. Fig. 135 Scandent graptoloids from the late Arenig to earliest Llanvirn of south Wales, a, Pseudotri- gonograptus ensiformis (Hall 1865), Upper Arenig, Fennian, B. rushtoni Biozone, Pontyfenni Forma- tion, loc. 23, x 3, Q5104. b, Glossograptus acanthus Elles & Wood 1908, latest Arenig, Fennian, D. levigena Biozone, Llanfallteg Formation, loc. 52J, x 2, Q5171. c, f, h, k, 'Glyptograptus austro- dentatus Harris & Keble 1932, Llanfallteg Formation; c, large specimen widening slowly to more than 2 mm, late Arenig, D. levigena Biozone, loc. 52S, x 6, Q5802; f, well-preserved rhabdosome, early Llanvirn, artus Biozone, loc. 50, x 10, Q5803; h, detail of proximal part of wide morph in relief, showing median septum and th l1, late Arenig, D. levigena Biozone, loc. 52L, x 8, Q5804; k, well-preserved form, slowly increasing in width, locality and horizon as last, x 5, Q5805. d, e, g, j, 'Glyptograptus' dentatus (Brongniart 1828); d, narrow morph from early horizon, Upper Arenig, Fennian, B. rushtoni Biozone, loc. 23, x 6, Q5808; e, wide morph from early horizon as Fig. 135d, x 5, Q5809; g, early Llanvirn, D. artus Biozone, loc. 50, x 6, Q5810; j, D. levigena Biozone, loc. 52P, x 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 the original British Museum (Natural History). London : BM(NH)
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