DOCSLIB.ORG

NORSK GEOLOGISK TIDSSKRIFT L

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

-- 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,
Recommended publications
  • Suture with Pointed Flank Lobe and ... -.: Palaeontologia Polonica

    Suture with Pointed Flank Lobe and ... -.: Palaeontologia Polonica

    210 JERZY DZIK Genus Posttornoceras Wedekind, 1910 Type species: Posttornoceras balvei Wedekind, 1910 from the mid Famennian Platyclymenia annulata Zone of the Rhenisch Slate Mountains. Diagnosis. — Suture with pointed flank lobe and angular or pointed dorsolateral lobe. Remarks. — Becker (1993b) proposed Exotornoceras for the most primitive members of the lineage with a relatively shallow dorsolateral lobe. The difference seems too minor and continuity too apparent to make this taxonomical subdivision practical. Becker (2002) suggested that this lineage was rooted in Gundolficeras, which is supported by the data from the Holy Cross Mountains. The suture of Posttornoceras is similar to that of Sporadoceras, but these end−members of unrelated lin− eages differ rather significantly in the geometry of the septum (Becker 1993b; Korn 1999). In Posttornoceras the parts of the whorl in contact with the preceding whorl are much less extensive, the dorsolateral saddle is much shorter and of a somewhat angular appearance. This is obviously a reflection of the difference in the whorl expansion rate between the tornoceratids and cheiloceratids. Posttornoceras superstes (Wedekind, 1908) (Figs 154A and 159) Type horizon and locality: Early Famennian at Nehden−Schurbusch, Rhenish Slate Mountains (Becker 1993b). Diagnosis. — Suture with pointed tip of the flank lobe and roundedly angulate dorsolateral lobe. Remarks.—Gephyroceras niedzwiedzkii of Dybczyński (1913) from Sieklucki’s brickpit was repre− sented by a specimen (probably lost) significantly larger than those described by Becker (1993b). The differ− ence in proportions of suture seem to result from this ontogenetic difference, that is mostly from increase of the whorl compression with growth. Distribution. — Reworked at Sieklucki’s brickpit in Kielce.
  • Nautiloid Shell Morphology

    Nautiloid Shell Morphology

    MEMOIR 13 Nautiloid Shell Morphology By ROUSSEAU H. FLOWER STATEBUREAUOFMINESANDMINERALRESOURCES NEWMEXICOINSTITUTEOFMININGANDTECHNOLOGY CAMPUSSTATION SOCORRO, NEWMEXICO MEMOIR 13 Nautiloid Shell Morphology By ROUSSEAU H. FLOIVER 1964 STATEBUREAUOFMINESANDMINERALRESOURCES NEWMEXICOINSTITUTEOFMININGANDTECHNOLOGY CAMPUSSTATION SOCORRO, NEWMEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Alvin J. Thompson, Director THE REGENTS MEMBERS EXOFFICIO THEHONORABLEJACKM.CAMPBELL ................................ Governor of New Mexico LEONARDDELAY() ................................................... Superintendent of Public Instruction APPOINTEDMEMBERS WILLIAM G. ABBOTT ................................ ................................ ............................... Hobbs EUGENE L. COULSON, M.D ................................................................. Socorro THOMASM.CRAMER ................................ ................................ ................... Carlsbad EVA M. LARRAZOLO (Mrs. Paul F.) ................................................. Albuquerque RICHARDM.ZIMMERLY ................................ ................................ ....... Socorro Published February 1 o, 1964 For Sale by the New Mexico Bureau of Mines & Mineral Resources Campus Station, Socorro, N. Mex.—Price $2.50 Contents Page ABSTRACT ....................................................................................................................................................... 1 INTRODUCTION
  • New Fossil Finds from the Cambro-Silurian Meta-Sediments on Hardangervidda

    New Fossil Finds from the Cambro-Silurian Meta-Sediments on Hardangervidda

    New Fossil Finds from the Cambro-Silurian Meta-sediments on Hardangervidda ARILD ANDRESEN Andresen, A. 1974: New fossil finds from the Cambro-Silurian meta-sedi ments on Hardangervidda. Norges geol. Unders. 304, 55-60. The occurrence of Actinoceroid cephalopods {Ormoceras (?) sp.), brachiopods {Orthis ss.), and trilobites {Ptycbopyge sp.) in a crystalline limestone over lying bluish quartzite on Hardangervidda indicates that Orthoceras Limestone of the Lower Ordovician Asaphus Series (Etage 3c) is present. The underlying quartzites are correlated with stage 3a-3b in the Oslo Region. A. Andresen, Mineralogisk-Geologisk Museum, Sarsgt. 1, Oslo 5, Norway Introduction Hardangervidda (Fig. 1) is, outside the Oslo Region, one of the largest areas in Norway where Cambro-Silurian sediments of eastern facies (foreland fac ies) are exposed. The stratigraphy and structure of these rocks are not very well known, partly because of the inaccessibility of the area, and partly due to the intense deformation and lack of fossiliferous beds. Even though the fossils described in this paper are badly preserved, making identification of species in some cases uncertain and in other cases impossible, they give some information about the Cambro-Silurian stratigraphy. The earliest contribution to the geology of Hardangervidda was made by Dahll (1861), who reported fossiliferous beds with Dictyonema flabelliforme (2e in the stratigraphic sequence of the Oslo Region) from Holberget (Fig. 1). Later, Brøgger (1893), after more detailed mapping, established a strati graphic sequence for the rocks overlying the Precambrian basement. In this sequence all the rocks above the Precambrian basement were assumed to be in a normal succession. The subdivision he established was, from the base upwards: 1, Alum shale; 2, Quartizite; 3, Crystalline limestone (marble); 4, Phyllites; 5, Various crystalline rocks.
  • Cambrian Cephalopods

    Cambrian Cephalopods

    BULLETIN 40 Cambrian Cephalopods BY ROUSSEAU H. FLOWER 1954 STATE BUREAU OF MINES AND MINERAL RESOURCES NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY CAMPUS STATION SOCORRO, NEW MEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Eugene Callaghan, Director THE REGENTS MEMBERS Ex OFFICIO The Honorable Edwin L. Mechem ...................... Governor of New Mexico Tom Wiley ......................................... Superintendent of Public Instruction APPOINTED MEMBERS Robert W. Botts ...................................................................... Albuquerque Holm 0. Bursum, Jr. ....................................................................... Socorro Thomas M. Cramer ........................................................................ Carlsbad Frank C. DiLuzio ..................................................................... Los Alamos A. A. Kemnitz ................................................................................... Hobbs Contents Page ABSTRACT ...................................................................................................... 1 FOREWORD ................................................................................................... 2 ACKNOWLEDGMENTS ............................................................................. 3 PREVIOUS REPORTS OF CAMBRIAN CEPHALOPODS ................ 4 ADEQUATELY KNOWN CAMBRIAN CEPHALOPODS, with a revision of the Plectronoceratidae ..........................................................7
  • Part I. Revision of Buttsoceras. Part II. Notes on the Michelinoceratida

    Part I. Revision of Buttsoceras. Part II. Notes on the Michelinoceratida

    MEMOIR 10 PART I Revision of Buttsoceras PART II Notes on the Michelinoceratida By ROUSSEAU H. FLOWER 1 9 6 2 STATE BUREAU OF MINES AND MINERAL RESOURCES NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY CAMPUS STATION SOCORRO, NEW MEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Alvin J. Thompson, Director THE REGENTS MEMBERS Ex OFFICIO The Honorable Edwin L. Mechem ........................................ Governor of New Mexico Tom Wiley .......................................................... Superintendent of Public Instruction APPOINTED MEMBERS William G. Abbott ............................................................................................... Hobbs Holm 0. Bursum, Jr. ......................................................................................... Socorro Thomas M. Cramer ......................................................................................... Carlsbad Frank C. DiLuzio ...................................................................................... Albuquerque Eva M. Larrazolo (Mrs. Paul F.) ............................................................... Albuquerque Published October I2, 1962 For Sale by the New Mexico Bureau of Mines & Mineral Resources Campus Station, Socorro, N. Mex.—Price $2.00 Contents PART I REVISION OF BUTTSOCERAS Page ABSTRACT ....................................................................................................................... INTRODUCTION .............................................................................................................................
  • Size Distribution of the Late Devonian Ammonoid Prolobites: Indication for Possible Mass Spawning Events

    Size Distribution of the Late Devonian Ammonoid Prolobites: Indication for Possible Mass Spawning Events

    Swiss J Geosci (2010) 103:475–494 DOI 10.1007/s00015-010-0036-y Size distribution of the Late Devonian ammonoid Prolobites: indication for possible mass spawning events Sonny Alexander Walton • Dieter Korn • Christian Klug Received: 17 December 2009 / Accepted: 18 October 2010 / Published online: 15 December 2010 Ó Swiss Geological Society 2010 Abstract Worldwide, the ammonoid genus Prolobites is Abbreviations only known from a few localities, and from these fossil SMF Senckenberg Museum, Frankfurt a. M., Germany beds almost all of the specimens are adults as shown by the MB.C. Cephalopod collection of the Museum fu¨r presence of a terminal growth stage. This is in marked Naturkunde Berlin (the collections of Franz contrast to the co-occurring ammonoid genera such as Ademmer, Werner Bottke, and Harald Simon Sporadoceras, Prionoceras, and Platyclymenia. Size dis- are incorporated here) tribution of specimens of Prolobites from three studied localities show that, unlike in the co-occurring ammonoid species, most of the material belongs to adult individuals. The morphometric analysis of Prolobites delphinus Introduction (SANDBERGER &SANDBERGER 1851) demonstrates the intra- specific variability including variants with elliptical coiling The mid-Fammenian (Late Devonian) ammonoid genus and that dimorphism is not detectable. The Prolobites Prolobites is only known from a few localities worldwide, material shows close resemblance to spawning populations mainly in the Rhenish Mountains and the South Urals. of Recent coleoids such as the squid Todarodes filippovae Where it does occur, the majority of the specimens show a ADAM 1975. Possible mass spawning events are discussed terminal growth stage suggesting that these are adults.
  • Contributions in BIOLOGY and GEOLOGY

    Contributions in BIOLOGY and GEOLOGY

    MILWAUKEE PUBLIC MUSEUM Contributions In BIOLOGY and GEOLOGY Number 51 November 29, 1982 A Compendium of Fossil Marine Families J. John Sepkoski, Jr. MILWAUKEE PUBLIC MUSEUM Contributions in BIOLOGY and GEOLOGY Number 51 November 29, 1982 A COMPENDIUM OF FOSSIL MARINE FAMILIES J. JOHN SEPKOSKI, JR. Department of the Geophysical Sciences University of Chicago REVIEWERS FOR THIS PUBLICATION: Robert Gernant, University of Wisconsin-Milwaukee David M. Raup, Field Museum of Natural History Frederick R. Schram, San Diego Natural History Museum Peter M. Sheehan, Milwaukee Public Museum ISBN 0-893260-081-9 Milwaukee Public Museum Press Published by the Order of the Board of Trustees CONTENTS Abstract ---- ---------- -- - ----------------------- 2 Introduction -- --- -- ------ - - - ------- - ----------- - - - 2 Compendium ----------------------------- -- ------ 6 Protozoa ----- - ------- - - - -- -- - -------- - ------ - 6 Porifera------------- --- ---------------------- 9 Archaeocyatha -- - ------ - ------ - - -- ---------- - - - - 14 Coelenterata -- - -- --- -- - - -- - - - - -- - -- - -- - - -- -- - -- 17 Platyhelminthes - - -- - - - -- - - -- - -- - -- - -- -- --- - - - - - - 24 Rhynchocoela - ---- - - - - ---- --- ---- - - ----------- - 24 Priapulida ------ ---- - - - - -- - - -- - ------ - -- ------ 24 Nematoda - -- - --- --- -- - -- --- - -- --- ---- -- - - -- -- 24 Mollusca ------------- --- --------------- ------ 24 Sipunculida ---------- --- ------------ ---- -- --- - 46 Echiurida ------ - --- - - - - - --- --- - -- --- - -- - - ---
  • United States National Museum Bulletin 262

    United States National Museum Bulletin 262

    SMITHSONIAN INSTITUTION MUSEUM O F NATURAL HISTORY For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C., 20402 - Price 70 cents UNITED STATES NATIONAL MUSEUM BULLETIN 262 Catalog of the Type Specimens of Invertebrate Fossils LOUIS R. PURNELL Part I: Paleozoic Cephalopoda SMITHSONIAN INSTITUTION PRESS WASHINGTON, D.C. 1968 Publications of the United States National Museum The scientific publications of the United States National Museum in- clude two series, Proceedings of the United States National Museum and United States National Museum Bulletin. In these series are published original articles and monographs dealing with the collections and work of the Museum and setting forth newly ac- quired facts in the field of anthropology, biology, geology, history, and technology. Copies of each publication are distributed to libraries and scientific organizations and to specialists and others interested in the various subjects. The Proceedings, begun in 1878, are intended for the publication, in separate form, of shorter papers. These are gathered in volumes, octavo in size, with the publication date of each paper recorded in the table of contents of the volume. In the Bulletin series, the first of which was issued in 1875, appear longer, separate publications consisting of monographs (occasionally in several parts) and volumes in which are collected works on related sub- jects. Bulletins are either octavo or quarto in size, depending on the the needs of the presentation. Since 1902, papers relating to the botanical collections of the Museum have been published in the Bulletin series under the heading Contributions from the United States National Herbarium.
  • Holochoanites Are Endoceroids Rousseau H

    Holochoanites Are Endoceroids Rousseau H

    HOLOCHOANITES ARE ENDOCEROIDS ROUSSEAU H. FLOWER, New York State Museum Albany 1, N. Y. INTRODUCTION The Holochoanites may be defined as those cephalopods in which the septal necks are so elongated that they extend from the septum of which they are a part and a prolongation, apicad to the next septum, or even farther. Hyatt (1884) first regarded the Holochoanoidea as one of two major divisions of the Nautiloidea. Later (1900) he replaced his other division, the Ellipochoanoidea, by four divisions the Orthochaonites, Cyrtochoanites, Schistochoanites and Mixochoanites, and changed the name Holochoanoidea to Holochoanites for uniformity. In the mean- time, further study caused him to modify the contents of the holochoanitic division materially. Some genera originally placed in this group, such as Trocholites, proved upon further study to possess ellipochoanitic septal necks. The genus Aturia, while properly holochoanitic, was removed, because it was recognized that it represented a development of elongated septal necks in Tertiary time, which was obviously quite unrelated to that of other holochoanitic cephalopods, few of which survived the close of the Ordovician. Miller and Thompson (1937) showed that the elongation of the septal necks in Aturia was a secondary feature and the ellipochoanitic ancestry was indicated by the retention of connecting rings. It was believed that the Holochaonites proper contain cephalopods in which the long necks were primitive, and no connecting rings were developed. Unfortunately Hyatt does not seem to have committed himself on his ideas concerning the relationship of the Holochoanites with other cephalopods. It is not clear whether this was because of his preoccupation with the phyletic sig- nificance of early stages and the controversy that developed about the origin of the Ammonoidea and their relationship to the Nautiloidea, or whether he was as much perplexed by the problem as have been those of us who have come after him in the study of cephalopods.
  • 1540 Evans.Vp

    1540 Evans.Vp

    An early Silurian (Aeronian) cephalopod fauna from Kopet-Dagh, north-eastern Iran: including the earliest records of non-orthocerid cephalopods from the Silurian of Northern Gondwana DAVID H. EVANS, MANSOUREH GHOBADI POUR, LEONID E. POPOV & HADI JAHANGIR The cephalopod fauna from the Aeronian Qarebil Limestone of north-eastern Iran comprises the first comprehensive re- cord of early Silurian cephalopods from peri-Gondwana. Although consisting of relatively few taxa, the assemblage in- cludes members of the orders Oncocerida, Discosorida, Barrandeocerida and Orthocerida. Coeval records of several of these taxa are from low palaeolatitude locations that include Laurentia, Siberia, Baltica and Avalonia, and are otherwise unknown from peri-Gondwana until later in the Silurian. The cephalopod assemblage occurs in cephalopod limestones that currently represent the oldest record of such limestones in the Silurian of the peri-Gondwana margin. The appear- ance of these cephalopods, together with the development of cephalopod limestones may be attributed to the relatively low latitudinal position of central Iran and Kopet-Dagh compared with that of the west Mediterranean sector during the Aeronian. This, combined with the continued post-glacial warming after the Hirnantian glaciation, facilitated the initia- tion of carbonate deposition and conditions suitable for the development of the cephalopod limestones whilst permitting the migration of cephalopod taxa, many of which were previously restricted to lower latitudes. • Key words: Llandovery, Aeronian, Cephalopoda, palaebiogeography, peri-Gondwana. EVANS, D.H., GHOBADI POUR, M., POPOV,L.E.&JAHANGIR, H. 2015. An Early Silurian (Aeronian) cephalopod fauna from Kopet-Dagh, north-eastern Iran: including the earliest records of non-orthocerid cephalopods from the Silurian of Northern Gondwana.
  • Adaptive Evolution in Paleozoic Coiled Cephalopods

    Adaptive Evolution in Paleozoic Coiled Cephalopods

    Paleobiology, 31(2), 2005, pp. 253±268 Adaptive evolution in Paleozoic coiled cephalopods BjoÈrn KroÈger Abstract.ÐCoiled cephalopods constitute a major part of the Paleozoic nekton. They emerged in the Early Ordovician but nearly vanished in the Silurian. The Emsian appearance of ammonoids started a story of evolutionary success of coiled cephalopods, which lasted until the end-Permian extinction event. This story is investigated by using a taxonomic database of 1346 species of 253 genera of coiled nautiloids and 1114 genera of ammonoids. The per capita sampling diversities, the Van Valen metrics of origination and extinction, and the probabilities of origination and ex- tinction were calculated at stage intervals. The outcome of these estimations largely re¯ects the known biotic events of the Paleozoic. The polyphyletic, iterative appearance of coiled cephalopods within this time frame is interpreted to be a process of adaptation to shell-crushing predatory pres- sure. The evolution of the diversity of coiled nautiloids and ammonoids is strongly correlated with- in the time intervals. Once established, assemblages of coiled cephalopods are related to changes in sea level. The general trends of decreasing mean (or background) origination and extinction rates during the Paleozoic are interpreted to re¯ect a successive stabilization of the coiled cephalopod assemblages. Different reproduction strategies in ammonoids and nautiloids apparently resulted in different modes of competition and morphological trends. Signi®cant morphological trends to- ward a stronger ornamentation and a centrally positioned siphuncle characterize the evolution of Paleozoic nautiloids. BjoÈrn KroÈger. Department of Geological Sciences, Ohio University, Athens, Ohio 45701 Present address: Museum fuÈr Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany.
  • Geology and Fossils Craigleith Area Ontario

    Geology and Fossils Craigleith Area Ontario

    THESE TERMS GOVERN YOUR USE OF THIS DOCUMENT Your use of this Ontario Geological Survey document (the “Content”) is governed by the terms set out on this page (“Terms of Use”). By downloading this Content, you (the “User”) have accepted, and have agreed to be bound by, the Terms of Use. Content: This Content is offered by the Province of Ontario’s Ministry of Northern Development and Mines (MNDM) as a public service, on an “as-is” basis. Recommendations and statements of opinion expressed in the Content are those of the author or authors and are not to be construed as statement of government policy. You are solely responsible for your use of the Content. You should not rely on the Content for legal advice nor as authoritative in your particular circumstances. Users should verify the accuracy and applicability of any Content before acting on it. MNDM does not guarantee, or make any warranty express or implied, that the Content is current, accurate, complete or reliable. MNDM is not responsible for any damage however caused, which results, directly or indirectly, from your use of the Content. MNDM assumes no legal liability or responsibility for the Content whatsoever. Links to Other Web Sites: This Content may contain links, to Web sites that are not operated by MNDM. Linked Web sites may not be available in French. MNDM neither endorses nor assumes any responsibility for the safety, accuracy or availability of linked Web sites or the information contained on them. The linked Web sites, their operation and content are the responsibility of the person or entity for which they were created or maintained (the “Owner”).