Palaeoecology and biostratigraphy of graptolites: - download pdf or read online

By C. P. Hughes, R. B. Rickards

ISBN-10: 0632010711

ISBN-13: 9780632010714

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Extra resources for Palaeoecology and biostratigraphy of graptolites: proceedings of the 2nd International Conference of the Graptolite Working Group of the International Palaeontological Association held at Cambridge University, 1-15 September 1981

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Thureaui postremus Ruedemann G. cf. geometricus Reudemann G. macer T. S. Hall Loganograptus logani Hall L. Iogani pertenuis Ruedemann Pseudobryograptus cf. incertus T. S. Hall Trichograptus cf. fergusoni T. S. Hall Tetragraptus aeclinans Keble T. amii Lapworth T. approximatus (Nicholson) T. bigsbyi (Hall) T. cf. chapmani Keble & Harris T. decipiens T. S. Hall T. fruticosus (Hall) T. harti T. S. Hall T. pendens ElleN T. T. reclinatus abbreviatus Bou6ek T. serra (Brogniart) T. cf. similis (Hall) T.

Possess a planktic precursor whose taxonomic affiliation with the family Anisograptidae has never been in doubt; whereas the sessile forms, with their Silurian-type form, Dictyonema retiforme (Hall 1843), are unequivocal members of the family Dendrograptidae (see Fig. ). The principal morphological criteria distinguishes the approximately 140 species of sessile Dictyonema (ranging from upper Cambrian to Carboniferous) and approximately 80 species (including subspecies) of planktic 'Dictyonema' are the possession of attachment structures (basal discs, root-like holdfasts, fibrous bundles, etc.

6); (C) Tetragraptus amii Lapworth, loc. 9); (E) Phyllograptus densus T6rnquist, loc. 5); (F) Tetragraptus harti T. S. Hall, loc. 6); (G) Apiograptus cf, crudus Harris & Thomas, loc. 6); (H) Aulograptus cf. cucullus Bulman, loc. 6); (I), (N) Didymograptus protobifidus Elles, loc. 5); (J) Didymograptus columbianus Ruedemann, loc. , loc. 5); (L) Didymograptus cf. hemicyclus Harris, loc. 5); (M) Didymograptus canadensis Ruedemann, loc. 5); (O) Phyllograptus ilicifolius major Ruedemann, loc. 6); (P) Didymograptus v-deflexus Harris, loc.

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Palaeoecology and biostratigraphy of graptolites: proceedings of the 2nd International Conference of the Graptolite Working Group of the International Palaeontological Association held at Cambridge University, 1-15 September 1981 by C. P. Hughes, R. B. Rickards


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