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NORSK GEOLOGISK TIDSSKRIFT L -- NORSK GEOLOGISK TIDSSKRIFT UTGITT AV NORSK GEOLOGISK FORENING OSLO MED STATSBIDRAG OG MED BIDRAG FRA NORGES ALMENVITENSKAPELIGE FORSKNINGS RAD REDAKTØR: NIELS-HENR. KOLDERUP BIND 38. h. l, pp. 1-178. A/S John Griegs Boktrykkeri l Bergen 1958 l ____ l NORSK GEOLOGISK TIDSSKRIFT 38 THE MIDDLE ORDOVICIAN OF THE OSLO REGION, NORWAY 10. Nautiloid Cephalopods BY WALTER c. SWEET (The Ohio State University, Columbus, Ohio, U.S. A.) With 21 plates and 20 figures in text CONTENTS :\bstract 4 Introduction and Acknowledgements ................................ 5 The Cephalopod Faunas . .. .. .. 6 Previous Mention . .. 6 Distribution and Stratigraphic Significance ...................... 12 Systematic Paleontology .......................................... 25 Classificati on .................................................. 25 Descriptive Terminology ...................................... 27 Descriptions .................................................. 28 Suborder Ellesmeroceratina Flower, 1950 ....................... 28 Family Baltoceratidae Kobayashi, 1935 ..................... 28 Genus Eobactrites Schindewolf, 1932 ....................... 28 Eobactrites sandbergeri (Barrande) ....................... 28 Family Bathmoceratidae Holm, 1899 ....................... 30 Genus Bathmoceras Barrande, 1865 ...................... 30 Bathmoceras norvegicum Sweet, n. sp.. ................... 32 Suborder Endoceratina Flower, 1950 .......................... 33 Family Endoceratidae Hyatt, 1883 ......................... 33 Genus Dideroceras Flower, 1950 .......................... 33 Dideroceras wahlenbergi (Foord) ......................... 35 Genus Endoceras Hall, 1844 .............................. 38 Endoceras spp. ............ .... ....... ... ...... .. 38 Genus Vaginoceras Hyatt, 1884 ........................... 40 Vaginoceras sp ........................................ 40 2 WALTER C. SWEET Genus Cyrtendoceras Remele, 1886 . .. .. .. .. .. .. .. 43 Cyrtendoceras, n. sp. .. .. .. .. .. .. .. .. .. .. .. .. 43 Suborder Actinoceratina Flower, 1950 .. .. .. .. .. .. .. .. .. 46 Family Armenoceratidae Foerste & Teichert 1930 . .. .. .. 46 Genus N ybyoceras Troedsson, 1926 . .. .. .. .. .. .. .. .. 46 Nybyoceras holmi Sweet, n. sp. .. .. .. .. .. .. .. .. 46 Nybyoceras sp. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 49 Family Ormoceratidae Saemann, 1852 . .. .. .. .. .. .. 50 Genus Ormoceras Stokes, 1838 . .. .. .. .. .. .. .. 50 Ormoceras kiaeri Sweet, n. sp. .. .. .. .. .. .. .. 50 Family Lambeoceratidae Flower, 1957........................ 52 Genus Hoeloceras Sweet, n. gen. .. .. .. .. .. .. .. .. .. .. 52 Hoeloceras helgoeyense Sweet, n. sp. .. .. .. .. .. .. 54 Hoeloceras askeri Sweet, n. sp. .. .. .. .. .. .. .. 56 Su border Michelinoceratina Flower, 1950 . .. .. .. .. .. 58 Family Michelinoceratidae Flower, 1945....................... 60 Genus Sactorthoceras Kobayashi, 1934 (emend. Flower, 1946) ... 60 Sactorthoceras sp. .. .. .. .. .. .. .. .. .. .. .. .. 60 Genus Polygrammoceras Foerste, 1927....................... 61 Polygrammoceras sp. .. .. .. .. .. .. .. .. .. .. .. .. 61 Genus Protokionoceras Grabau & Shimer, 1910 . .. .. 62 Protokionoceras strandi Troedsson . .. .. .. .. .. .. .. .. 62 Genus Kionoceras Hyatt, 1884 . .. .. .. .. .. .. .. 63 "Kionoceras" sp. .. .. .. .. .. .. .. .. .. .. .. .. .. 63 Family Stereoplasmoceratidae Kobayashi, 1934 . .. .. .. .. 64 Genus Stereoplasmoceras Grabau, 1922 .. .. .. .. .. .. .. 64 Stereoplasmoceras longicameratum Sweet, n. sp. .. .. 64 Genus Stereoplasmocerina Kobayashi, 1936 . .. .. .. .. .. .. .. 67 Stereoplasmocerina lineata Sweet, n. sp. .. .. .. .. .. 67 Stereoplasmocerina approximata Sweet, n. sp. .. .. .. .. .. 69 Genus Ctenoceras Noetling, 1884 . .. .. .. .. .. .. .. .. 71 Ctenoceras sp. A.. .. .. .. .. .. .. .. .. .. .. .. .. 73 Ctenoceras sp. B........................................ 74 Genus Ephippiorthoceras Foerste, 1924 .. .. .. .. .. .. 76 Ephioppirthoceras frognoeyense Strand .. .. .. .. .. 76 ?Genus Stereospyroceras Flower, 1955 . .. .. .. .. .. .. .. 76 Stereopsyroceras? sp. .. .. .. .. .. .. .. .. .. 76 ?Genus Gorbyoceras Shimizu & Obata, 1935 . .. .. .. .. .. .. 78 Gorbyoceras? sp... .. .. .. .. .. .. .. .. .. .. .. .. .. 78 Suborder Ascoceratina Flower, 1950 .. .. .. .. .. .. .. .. .. 79 Family Hebetoceratidae Flower, 1940......................... 79 Genus Probillingsites Foerste, 1928 . .79 . Probillingsites, n. sp.. .. .. .. .. .. .. .. .. .. .. .. .. .. 79 Suborder Oncoceratina Flower, 1950 . .. .. .. .. .. .. .. .. 80 THE :IIIDDLE ORDOYICIA),T, 10. :\AlJTILOID CEPHALOPODS 3 ------------- -·----- -· . -------- Family Oncoceratidae Hyatt, 1883 . .. .. .. .. .. .. .. .. 80 Genus Oncoceras Hall, 1847 . 80 Oncoceras sp. .. .. .. .. .. .. .. .. .. .. .. .. 80 Genus Beloitoceras Foerste, 1924 . .. .. .. .. .. .. .. 81 Beloitoceras stoermeri Sweet, n. sp. .. .. .. .. .. .. .. .. .. 81 Family Allumettoceratidae Flower, 1946 . .. .. .. .. .. .. .. 84 Genus Allumettoceras Foerste, 1926 . 84 Allumettoceras mjoesense Sweet, n. sp. .. .. .. .. .. .. 84 ?Genus Tripteroceras Hyatt, 1884 . 86 Tripteroceras? problematicum Sweet, n. sp. .. .. .. .. .. 86 Family Valcouroceratidae Flower, 1946 . .. .. .. .. .. .. .. 88 ?Genus Valcouroceras Flower, 1943 . .88 . Valcouroceras? holtedahli Sweet, n. sp. .. .. .. .. .. .. 88 Family Diestoceratidae Foerste, 1926 . .91 . Genus Diestoceras Foerste, 1924 . .. .. .. .. .. .. .. 91 Diestoceras sp. .. .. .. .. .. .. .. .. .. .. .. .. 91 Suborder Tarphyceratina Flower, 1950 .. .. .. .. .. .. .. .. 92 Family Trocholitidae Chapman, 1857 . 9Z Genus Trocholites Conrad, 1838 . 92 Trocholites depressus (Eichwald) . .. .. .. .. .. .. 93 Trocholites contractus Schroder .. .. .. .. .. .. .. .. .. .. 95 Trocholites hospes (Reme!e) . .. .. .. .. .. .. .. .. .. .. 96 Genus Discoceras Barrande, 1867 . .. .. .. .. .. .. .. .. 98 Discoceras arcuatum (Lossen) . .. .. .. .. .. .. .. 103 Discoceras boreale Sweet, n. sp. .. .. .. .. .. .. .. .. .. 105 Discoceras boreale amplicameratum Sweet, n. subsp. ....... 106 Discoceras depressum Sweet, n. sp. 108 Discoceras fleischeri Sweet, n. sp. .. .. .. .. .. .. .. .. .. .. 110 Discoceras ievesense (Balaschov) .... ... ... ......... ...... 112 Discoceras rarospira (Eichwald) . .. .. .. .. .. .. .. .. 114 Family Lituitidae Phillips , 1848. .. .. .. .. .. .. .. .. .. .. .. 115 Genus Holmiceras Hyatt, 1894 ............................ 125 Holmiceras kjerulfi (Brøgger) .. .... ..... .... ... .... 127 Genus Ancistroceras Boll, 1857 . .. .. .. .. .. .. .. .. .. 128 A ncistroceras undulatum Boll 129 Ancistroceras undulatum Boll? .. .. .. .. .. .. .. .. .. .. 130 Genus Angelinoceras Hyatt, 1894 .......................... 131 Angelinoceras sp. ..................................... 132 Genus Rhynchorthoceras Remele, 1882 . .. .. .. .. .. .. 133 Rhynchorthoceras helgoeyense Sweet, n. sp. .. .. .. .. .. .. .. 135 Rhynchorthoceras angelini (Boll)? . .. .. .. .. .. .. .. .. .. .. 140 Genus Lituites Bertrand, 1763 .. .. .. .. .. .. .. .. .. .. .. 141 Lituites lituus Montfort? . .. .. .. .. .. .. .. .. 142 Lituites perfectus Wahlenberg . .. .. .. .. .. .. .. .. 144 4 \VAL TER C. SWEET �---- -- -----�----- Genus Trilacinoceras Sweet, n. gen. ....................... 147 Trilacinoceras discors (Holm) ... .... ...... .. ... ........... 148 Trilacinoceras norvegicum Sweet, n. sp. .. .. .. .. .. .. 150 Trilacinoceras sp.. .. .. .. .. .. .. .. .. .. .. .. .. 152 Genus Cyclolituites Remeie, 1886 . .. .. .. .. .. .. .. 153 Cyclolituites lynnensis (Kjerulf) ... .. .... ......... .... .... 154 Cyclolituites kjerulfi Sweet, n. sp. .. .. .. .. .. .. .. .. .. 157 ?Genus Tyrioceras Strand, 1933 .. .. .. .. .. .. .. .. .. .. 159 Tyrioceras? sp... .. .. .. .. .. .. .. .. .. .. .. .. .. 159 Suborder Discosorina Flower, 1940 ............................. 160 Family Ruedemannoceratidae Flower, 1950 . .. .. .. .. .. 160 ?Genus Ruedemannoceras Flower, 1940 .. .. .. .. .. .. 160 Ruedemannoceras? sp . .. ..... .. ... ..... .. .... ..... ... ... 160 Family Westonoceratidae Teichert, 1933 ...................... 162 Genus Broeggeroceras Sweet, n. gen. .. .. .. .. .. .. 162 Broeggeroceras contractum Sweet, n. sp. ................... 162 Broeggeroceras? elongatum Sweet, n. sp ........... ..... .... 165 Family Cyrtogomphoceratidae Flower, 1940 ................... 166 Genus Strandoceras Flower, 1946 .......................... 166 Strandoceras strandi Sweet, n. sp... .. .. .. .. .. .. .. 167 Strandoceras sp. .. .. .. .. .. .. .. .. .. .. .. 169 Literature . 170 Plates 1-21 . .. .. ...... ... .. .... .... ..... ....... ......... ... .. 177 Abst ra c t : Forty identifiable species of nautiloid cephalopods, referable to 38 genera, are described from the Middle Ordovician Ogygiocaris and Chas­ mops Series of the Oslo Region, Norway. A comparison of the cephalopod fau­ nas represented with others in the Scando-Baltic province tends to confirm previously suggested correlations of the Ogygiocaris Series with the Platyurus, Schroeteri, and at !east part of the Crassicauda limestones of Sweden. Many of the same cephalopod species found in Ogygiocaris strata are also known from the Aseri, Lasnamae, and Uhaku limestones of Estonia, and two species from the lower portion of this Series are closely similar to forms known best from the essentially contemporaneous sarka beds of Bohemia. Ogygiocaris Series cephalopods have little in common with presumably contemporaneous forms in North America, but the same general fauna, or regional variants of it, seems to occur in Korea, Manchuria, India,
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