CiNii Books - Lower Ordovician trilobites of the Kirtonryggen Formation, Spitsbergen

This monograph describes early Ordovician (Ibexian: Tremadocian-early Floian) trilobites from Northern Spitsbergen from the section through the Kirtonryggen Formation adjacent to Hinlopen Strait. The Formation is divided into three Members, each with distinct trilobites collectively representing the fullest known succession from the Bathyurid biofacies of the eastern Laurentian carbonate platform. Previous research on the Ordovician of Spitsbergen is summarised and correlations with similar faunas previously described from Canada, Greenland, western Newfoundland, Vermont-New York State, Oklahoma and Missouri are discussed. Taxonomic problems are discussed in detail leading to the recognition of 53 species, of which 15 are new, belonging to 31 genera including four new. Twenty-four taxa are described under open or tentative nomenclature. The lower Member yields the earliest known occurrences of the Illaenoidea, Proetoidea and Scutelluoidea, supporting the hypotheses relating the origin of new major clades to inshore habitats.

Table of Contents

Introduction 2 Summary of previous research on the Ordovician of Spitsbergen 3 Stratigraphy of the Kirtonryggen Formation 4 Stratigraphic sub-divisions and age 4 Tremadocian-Floian boundary 9 Correlation with other areas of Ordovician Laurentia 10 Greenland 11 Canada 12 Northwest Scotland 13 USA 13 Occurrence of trilobites in the Kirtonryggen Formation 15 Field occurrence 15 Biofacies and biogeography 15 Peculiarities of the Spitsbergen faunas 16 Eastern and western Laurentia 17 Origin of major trilobite clades 18 Th e family Bathyuridae 19 Th e problem of type species 20 Morphology of Bathyuridae 21 Systematic Palaeontology 23 Order Aulacopleurida Adrain, 2011 23 Family Hystricuridae Hupe, 1953 23 Genus Svalbardicurus ngen 23 Svalbardicurus delicatus nsp 24 Genus Hystricurus Raymond, 1913 26 Hystricurus cfHystricurus spnovB Adrain et al., 2003 26 Hystricurus sp1 27 Order Proetida Fortey & Owens, 1975 28 Family Bathyuridae Walcott, 1886 28 Sub-family Bathyurinae Walcott, 1886 28 Genus Bolbocephalus Whitfi eld, 1890 28 Bolbocephalus gunnari nsp 30 Bolbocephalus convexus (Billings, 1865) 31 Bolbocephalus stclairi Cullison, 1944 33 Bolbocephalus spcfBkindlei Boyce, 1989 35 Genus Catochia Fortey, 1979 35 Catochia hinlopensis nsp 35 Catochia ornata Fortey, 1979 37 Genus Jeffersonia Poulsen, 1927 37 Jeffersonia striagena nsp 38 Jeffersonia viator nsp 42 Jeffersonia timon (Billings, 1865) 44 'Jeffersonia' aff Jgranosa Cullison, 1944 46 Genus Peltabellia Whittington, 1953 46 Peltabellia glabra nsp 47 Genus Petigurus Raymond, 1913 49 Petigurus nero (Billings, 1865) 49 Petigurus groenlandicus Poulsen, 1937 50 Genus Psalikilopsis Ross, 1953 52 Psalikilopsis nspaff Pcuspicaudata Ross, 1953 53 Bathyurine ngennspA 54 Sub-family Bathyurellinae Hupe, 1953 55 Genus Bathyurellus Billings, 1865 55 Bathyurellus abruptus Billings, 1865 56 Bathyurellus diclementsae nsp 57 Genus Benthamaspis Poulsen, 1946 60 Benthamaspis gibberula (Billings, 1865) 60 Benthamaspis conica Fortey, 1979 62 Genus Ceratopeltis Poulsen, 1937 63 Ceratopeltis cfCbatchensis Adrain & Westrop, 2005 63 Genus Chapmanopyge ngen 63 Chapmanopyge cfsp1 (Loch, 2007) 65 Chapmanopyge 'amplimarginiata' (Billings, 1865) 65 Chapmanopyge cfCsanddoelaensis (Adrain & Westrop, 2005) 67 Chapmanopyge nspA 68 Genus Grinnellaspis Poulsen, 1946 68 Grinnellaspis newfoundlandensis Boyce, 1989 68 Genus Harlandaspis ngen 68 Harlandaspis elongata nsp 71 Genus Licnocephala Ross, 1951 74 Licnocephala brevicauda (Poulsen, 1937) 74 Licnocephala nspA 75 Licnocephala nspB 76 Licnocephala? nspC 76 Genus Punka Fortey, 1979 76 Punka latissima nsp 77 Punka fl abelliformis Fortey, 1979 79 Genus Uromystrum Whittington, 1953 80 Uromystrum affi ne (Poulsen, 1937) 81 Uromystrum aff Uaffine (Poulsen, 1937) 84 Uromystrum drepanon nsp 85 Family Dimeropygidae Hupe, 1955 86 Genus Ischyrotoma Raymond, 1925 86 Ischyrotoma parallela (Boyce,1989) 87 Ischyrotoma nspA 89 Family Proetidae Salter, 1864 90 Genus Phaseolops Whittington, 1963 90 Phaseolops? bobowensi nsp 90 Family Telephinidae Marek, 1952 92 Genus Carolinites Kobayashi, 1940 92 Carolinites? nspA 92 Order Corynexochida Kobayashi, 1935 94 Family Illaenidae Hawle & Corda, 1847 94 Genus Illaenus Dalman, 1827 94 Subgenus Illaenus (Parillaenus) Jaanusson, 1954 94 Illaenus (Parillaenus) primoticus nsp 94 Family Leiostegiidae Bradley, 1925 96 Genus Leiostegium Raymond, 1913 96 Leiostegium spongiosum nsp 96 Family Styginidae Vogdes, 1890 98 Genus Raymondaspis P!ribyl, 1948 98 Raymondaspis? pingpong nsp 98 Order Asaphida Salter, 1864 100 Superfamily Asaphoidea Salter, 1864 100 Family Asaphidae Salter, 1864 100 Genus Lachnostoma Ross, 1951 100 Lachnostoma platypyga nsp 101 Genus Stenorhachis Hintze & Jaanusson, 1956 102 Stenorhachis nspA 102 Family Remopleurididae Hawle & Corda, 1847 104 Genus Eorobergia Cooper, 1953 104 Eorobergia nspA 104 Superfamily Cyclopygoidea Raymond, 1925 105 Family Symphysurinidae Kobayashi, 1955 105 Genus Eurysymphysurina ngen 105 Eurysymphysurina spora nsp 106 Genus Randaynia Boyce, 1989 107 Randaynia nspA 108 Order Phacopida Salter, 1864 110 Family Pilekiidae Sdzuy, 1955 110 Genus Pilekia Barton, 1915 110 Pilekia cfPtrio Hintze, 1953 110 Incertae Ordinis 111 Family Shumardiidae Lake, 1907 111 Genus Conophrys Callaway, 1877 111 Conophrys sp1 111 Incertae sedis 111 Genet spindet1 111 Genet spindet2 111 Proetid metaprotaspis 112 Acknowledgements 112 References 112

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Lower Ordovician trilobites of the Kirtonryggen Formation, Spitsbergen

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