DOCSLIB.ORG

Relationships Between Ordovician Baltic and North American Midcontinent Conodont Faunas

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Relationships Between Ordovician Baltic and North American Midcontinent Conodont Faunas Relationships between Ordovician Baltic and North American Midcontinent conodont faunas JERZY DZIK FOSSILS AND STRATA Dzik, Jerzy 1983 12 15: Relationships between Ordovician Baltic and North American Midcontinent conodont faunas. Fossils and Strata. No. 15, pp. 59-85. Oslo. ISSN 0300-9491. ISBN 82-0006737-8. During most of the Early and Middle Ordovician, epicontinental seas of Laurentia, Baltica, and islands in the Iapetus Ocean between them were centers of diversification of different groups of conodonts. The most important were Phragmodontidae in Laurentia, Periodontidae in the Iapetus area, and Balognathidae in Baltica. Spectra of fossil assemblages (analyzed in terms of conodont lineages) were very stable through time in each of these biogeographic provinces. Relatively few lineages passed the biogeographic boundaries and successful immigrations were rare. An especially stable composition characterizes the Baltic faunas. A profound change in the composition of faunas in Baltica took place in the Oanduan (late Caradocian) through influx of several lineages previously confined to islands in the Iapetus. Conodont faunas of Laurentia, at times enriched by Iapetus-born lineages, evolved rather gradually until the end of the Ordovician. Diversity of Ordovician conodont assemblages seems to depend more on local ecologic factors and bathymetry than on climate. OConodonta, biostratigraphy, biogeography, evolution, Ordovician. ECOS III Jerzy Dzik, Department of Geology and Mineralogy, The Ohio State University, Columbus, Ohio 43210, A contribution to the Third European U.S.A. (Present address: Zaktad Paleobiologii PAN, Aleja Żwirki i Wigury 93, PL-02-089 Warszawa, Conodont Symposium, Lund, 1982 Poland); 11 th August, 1982. Ordovician bioprovincialism has received much attention systems of terminology for elements in the conodont apparatus from conodont workers and several important contributions (for review, see Sweet 1981 b; also Barnes et al. 1979 and Dzik & to its recognition have been published (for review, see Trammer 1980) two seem to be applicable for most apparat- Jaanusson 1979; Sweet & Bergstrom 1974; Jaanusson & uses. Those are Jeppsson's (1971) and Sweet's (1981b) Bergstrom 1980; Lindstrom 1976 b). The profound difference systems. When applied to sextimembrate apparatuses they between conodont faunas of the North American Midconti- are easily transferable to each other. nent and those of the southeastern Appalachians and Europe For the purpose of the present paper Jeppsson's notation has been recognized since the Sweet el al. (1959) paper. A has been chosen. It was originally introduced as a tool for boundary separating these two distinct biogeographic units expressing homology of elements. Symbols of all types of has been traced along the Helena-Saltville fault in the elements are derived by abbreviations of former form- southern Appalachians and corresponding structural features taxonomic generic names, which seems to be in good agree- to the north (Bergstrom 1971; Jaanusson & Bergstrom 1980). ment with tradition in biological terminology. In the same way Although changes in the distribution of particular Late terms for, say, larval stages (echinospira, pilidium, calyptopis, Ordovician conodont taxa have been discussed in detail by zoea, etc.), or organs (stigmaria, helens, aptychi, etc.) have Sweet & Bergstrom (1974) and faunal changes across the been introduced, all being based on names of former taxa. Appalachians in the Middle Ordovician have been presented This does not leave a place for uncertainty regarding reference by Bergstrom & Carnes (1976), much remains to be done for homologization. Particular types of elements are identified regarding the pattern of distribution and shifts of Early and in any apparatus by homologization with particular elements Middle Ordovician conodont lineages in Europe as well as of the Ozarkodina apparatus. There is no assumed a priori order precisely tracing relationships of those lineages that are in arrangement of the types of elements in the apparatus, thought to be typical of provinces. It must be stated, however, therefore no trouble appears when insertion of a new type of that data are still far from complete, and numerous key faunas element into the transition series appears necessary. (for example those from the Middle Ordovician of Great The apparatus of Amorphognathus is proposed here as a Britain and the Sudeten Mountains) have not yet been homologization standard for septimembrate apparatuses. described in terms of multielement taxonomy. Accordingly, The complete set of elements in such apparatuses contains, this paper is just a preliminary report on a study that remains according to this notation (in supposed order), sp, oz, tr, pi, to be completed. ke, hi, and ne types. Sweet (1981b) and Bergstrom (1981) proposed to consider the keislognathiform element of Amor- phognathus as pi (Sb) and consequently created 'location' Sd for Terminology tetraprioniodontiform elements. There are, however, analog- Choice of the best element-notation system begins to be a ous tetraramous elements in the pi (Sb) location in apparat- difficult task for conodontologists. Among several proposed uses other than those of the Balognathidae (for example 60 Jerzy Dzik FOSSILS AND STRATA 15 (1983) Microzarkodina and Paraprioniodus), while it has been asserted change in the distribution of some organisms. The concepts of that the keislognathiform element is a homologue of one of the island biogeography (MacArthur & Wilson 1967) are applic- Sc elements in those Balognathidae that do not have it (Dzik able to such biogeographic units. It is not difficult to find 1976). In the typical apparatus of the Balognathidae, Sa, boundaries in the terrestrial environment with the features tetraprioniodontiform (Sb), keislognathiform, and Sc ele- required by this definition. The marine environment is much ments form a single symmetry transition series, and a keislo- more continuous, but discontinuities in the distribution of gnathiform element should be inserted between Sb and Sc particular marine environments such as margins of the elements. This could be done either by introducing a third continental shelf, areas of convergence of warm and cold letter to the notation (like Sbb) or by replacing Sc elements water, thermoclines, a range of uplifts of oceanic currents sensu Sweet (1981b) to Sd location and reserving the Sc carrying biogenes, etc., can be used to delineate boundaries location only for homologues of the keislognathiform elements between marine ecosystems. All these factors may separate of Amorphognathus (which I would prefer). Kuwano (1982) oceanic water into discrete cells that are different in the proposed symbols Sa-b and Sb for homologues of pi and ke composition of their faunal and floral assemblages. Features of elements in the Ozarkodina excavata (Branson & Mehl) these cells may change with the evolution of climate and even apparatus, respectively. more profoundly with the tectonic evolution of continents Meanings of other terms used in the text are explained in the (Williams 1976). In the present paper the Ordovician epicon- Treatise on Invertebrate Paleontolog)! (Sweet 1981 b). There also all tinental seas of Laurentia (the Midcontinent province), taxonomic, auctor references that are not listed in this paper Baltica (the Baltic province), and islands in the Iapetus Ocean can be found. between them (the North Atlantic province) are considered to be paleobiogeographic units of this kind (Fig. 1). Comments on methodology Four main kinds of faunal processes may be connected with the evolution of biogeographic units defined above: (1) One basic trouble in establishing a good scientific framework Phyletic evolution of particular species. (2) Change in the for a discussion of conodont provincialism is the lack of distribution of particular species within boundaries of the unequivocal meaning for units in paleobiogeography. Con- unit. (3) Immigrations of species from other ecosystems, cepts of high-rank biogeographic units are usually based on which displace local species from their niches, but do not more or less objectively determined differences in the composi- change the state of faunal equilibrium. (4) Immigrations of tion of faunistic assemblages from different areas. This does species that occupy previously uninhabited niches, or destruc- not create special difficulties unless problems of the boundary tion of the previous distribution of niches, in both cases between particular units and their change in geologic time are changing faunal equilibrium. involved. Then any biogeographic unit appears to have a How can one recognize these basically different processes particular meaning that depends on methods used in recogniz- from the limited fossil record? It would be especially important ing it and the particular group of fossils used, rather than on to have a tool that permits distinction between rebuilding of objective factors (Jaanusson 1979). For these reasons Lind- the fossil assemblage caused by a local environmental change strom (1976 a) has proposed to separate the territorial and and immigration of extrinsic faunal elements. Solution of this faunistic aspects of provincialism, and to abandon the first one problem seems to be the first step to the serious considerations and shift the discussion toward aspects of the evolution of of bioprovincialism (see discussion in Sweet & Bergstróm particular faunas. These may completely change their dis- 1974; Barnes et al. 1973; Bergstrom
Load more

Recommended publications
  • Orta Toroslar'da Konodont Biy Ostratigrafisi(1 )
    Türkiye Jeoloji Kurumu Bülteni, e. 20, 35-48, Şubat 1977 Bulîetin of the Geölogical Boclety of Turkey, v. 20, 35-48, February 1977 Orta Toroslar'da konodont biy ostratigrafisi(1 ) Conodontbiostratigra/phy in the Middle Taurus ÎSMET GEDİK Jeoloji Bölümü, Karadeniz Teknik Üniversitesi, Trabzon ÖZ: Çalışılan bölgede, Kambriyen-Triyas arasına ait konodont faunası saptanmış ve kısaca tanıtılmıştır. Metamorfik Alan- ya Masifinin bir nap şeklinde Sedre Triyas'mm üzerine geldiği ve bunun da bir tektonik pencere olarak görüldüğü görü- şüne varılmıştır. Hadimopanella oezgueli n. gen. n. sp. (incertae sedis) ve üç yeni konodont türü bulunmuştur. ABSTRACT: in the area studied Cambrian to Triassie systems are distinguished by the use of conodonts and their fauna is deseribed briefly. it is believed that the metamorphic Alanya massif overlays the Sedre Triassie as a nappe, forming a teetonic window. Hadimopanella oezgueli n. gen. n. sp. (İncertae sedis) and three new conodont speeies are established. (1) Bu yazı Türkiye Jeoloji Kurumu 30. Bilimsel Kurultayında bildiri olarak sunulmuştur. 36 GEDÎK GİRİŞ ve Monod, 1970). İçlerinde bazı trilobit lanmasmdon oluşan ve kalınlığı 1000 m parçalarına rastlanmıştır. Üste doğru kil yi aşan Seydişehir Formasyonuna geçti- Bu çalışma, özellikle son 20 yılda oranı gittikçe artarak, yaklaşık 50 m ği görülür. Bu formasyonun ilk 50 m lik büyük stratigrafik önem kazanan ve ge- kalınlığındaki kırmızımsı - morumsu, alt düzeylerinde bulunan kireçtaşı mer- niş çapta jeolojik formasyonların korre- yumrulu kireçtaşlarına geçilir. Bu dü- ceklerinden elde eddlen lasyonunda kullanılan konodontlardan zey içinde bol olarak Conocoryphe, Oneotodus tenu4s yararlanarak, ülkemizin bir bölgesinin Öoryneocochus, vb. gibi Orta Kambriyen stratigrafisini biraz daha aydınlığa ka- Fumishina furnishi yaşındaki tribolitlere ve akrotretid bra- Hertzima bisulcata vuşturmak ve dolayısiyle jeolojik yapısı- kiyopodlara rastlanılmıştır.
    [Show full text]
  • Conodonts in Ordovician Biostratigraphy
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Archivio istituzionale della ricerca - Università di Modena e Reggio Emilia 1 Conodonts in Ordovician biostratigraphy STIG M. BERGSTRÖM AND ANNALISA FERRETTI Conodonts in Ordovician biostratigraphy The long time interval after Pander’s (1856) original conodont study can in terms of Ordovician conodont biostratigraphic research be subdivided into three periods, namely the Pioneer Period (1856-1955), the Transition Period (1955-1971), and the Modern Period (1971-Recent). During the pre-1920s, the few published conodont investigations were restricted to Europe and North America and were not concerned about the potential use of conodonts as guide fossils. Although primarily of taxonomic nature, the pioneer studies by Branson & Mehl, Stauffer, and Furnish during the 1930s represent the beginning of the use of conodonts in Ordovician biostratigraphy. However, no formal zones were introduced until Lindström (1955) proposed four conodont zones in the Lower Ordovician of Sweden, which marks the end of the Pioneer Period. Because Lindström’s zone classification was not followed by similar work outside Baltoscandia, the time interval up to the late 1960s can be regarded as a Transition Period. A milestone symposium volume, entitled ‘Conodont Biostratigraphy’ and published in 1971, 2 summarized much new information on Ordovician conodont biostratigraphy and is taken as the beginning of the Modern Period of Ordovician conodont biostratigraphy. In this volume, the Baltoscandic Ordovician was subdivided into named conodont zones whereas the North American Ordovician succession was classified into a series of lettered or numbered Faunas. Although most of the latter did not receive zone names until 1984, this classification has been used widely in North America.
    [Show full text]
  • At Lava River, Northwestern Russia
    NORWEGIAN JOURNAL OF GEOLOGY Arenig conodonts, northwestern Russia 161 The Ordovician Billingen/Volkhov boundary inter­ val (Arenig) at lava River, northwestern Russia Tatiana Tolmacheva & Petr Fedorov Tolmacheva, T. & Fedorov, P. The Ordovician BillingenNolkhov boundary interval (Arenig) at Lava River, northwestern Russia. Norsk Geologisk Tidsskrift,Vol. 81, pp. 161-168. Trondheim 200 l. ISSN 0029-196X. A detailed study of the conodont distribution within the condensed carbonate beds around the boundary of Billingen and Volkhov Stages (Lower Ordovician, Arenig) in northwestern Russia confirms the presence of a continuous succession of conodont biownes recognized in contempora­ neous sequences in Scandinavia. The Baltoniodus triangularis and Microzarkodina sp. A zones are reported for the first time from East Baltica, where carbonates of this interval underwent extensive bioturbation and are characterized by a number of closely spaced and distinctive glauconi­ tic hardground surfaces. It has been revealed that the distribution of conodont elements around the hardground surfaces is strongly affected by bioturbation. Tatiana Tolmacheva, Department of Historical Geology and Palaeontology, In stitute of Earth Sciences, Un iversity of Up psala, Norbyviigen 22, 75236 Upp sala, Sweden; Petr Fedorov, Department of Historical Geology, St. Petersburg State Un iversity, 7/9 Un iversitetskaja emb., 199034, St. Petersburg, Russia. lntroduction zonation has not been determined across the Bil­ tingen-Volkhov boundary interval in most sections in In Baltica the boundary between the Billingen and Estonia and western Russia. The main object of this Volkhov Stages (lower Arenig) coincides with the base pa per is to give the first detail ed study of the conodont of Megistaspis polyphemus trilobite Biozone ( =Megis­ distribution and lithostratigraphy of this important taspis lata Biozone of Mannil & Meidla 1994).
    [Show full text]
  • A Proposed GSSP for the Base of the Middle Ordovician Series: the Huanghuachang Section, Yichang, China
    105 by Xiaofeng Wang1, Svend Stouge2, Bernd-D. Erdtmann3, Xiaohong Chen1, Zhihong Li1, Chuanshang Wang1, Qingluan Zeng1, Zhiqiang Zhou4, and Huiming Chen1 A proposed GSSP for the base of the Middle Ordovician Series: the Huanghuachang section, Yichang, China 1. Yichang Institute of Geology & Mineral Resources, Yichang, Hubei 443003, China. E-mail: [email protected] 2. Geological Museum, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark. E-mail: [email protected] 3. Institut für Angewandte Geowissenschaften, Technical University, Berlin, Germany. E-mail: [email protected] 4. Xi'an Institute of Geology & Mineral Resources, Xi'an, Shangxi, 710054, China. The Huanghuachang section near Yichang, southern stage), the yet-to-be-named Second stage, the Darriwilian (fourth China meets the requirements of Global Stratotype Sec- stage), and the yet-to-be-named Fifth stage— and two global series— the Lower Ordovician Series and the Upper Ordovician Series—have tion and Point (GSSP) for the base of the Middle Ordovi- thus far been formally ratified by the ICS. Among the remaining cian Series and the yet-to-be-named third stage of the series or stage, one focus is on the investigation and selection of the Ordovician System (or lower stage of Middle Ordovician GSSP for the base of the Middle Ordovician Series, which also is the Series). The conodont succession at the section is com- base of the Third stage. Two biozone levels that appear to have poten- tial for reliable correlation of the base of the Middle Ordovician plete across the Lower to Middle Ordovician series Series have been suggested by the working group of the ISOS: the boundary and several excellent phylogenetic lineages of base of Tripodus laevis conodont Biozone/Isograptus v.
    [Show full text]
  • Early Ordovician Conodonts from Far Western New South Wales, Australia. Records of the Australian Museum 55(2): 169–220
    © Copyright Australian Museum, 2003 Records of the Australian Museum (2003) Vol. 55: 169–220. ISSN 0067-1975 Early Ordovician Conodonts from Far Western New South Wales, Australia YONG-YI ZHEN1*, IAN G. PERCIVAL2 AND BARRY D. WEBBY3 1 Division of Earth & Environmental Sciences, Australian Museum, 6 College Street, Sydney NSW 2010, Australia [email protected] 2 Specialist Services Section, Geological Survey of New South Wales, PO Box 76, Lidcombe NSW 2141, Australia [email protected] 3 Centre for Ecostratigraphy & Palaeobiology, Department of Earth & Planetary Sciences, Macquarie University NSW 2109, Australia [email protected] ABSTRACT. Thirty species (representing 19 genera) of Early Ordovician conodonts are described and illustrated from Mount Arrowsmith and Koonenberry Gap in the northwestern part of New South Wales. One new genus, Cooperignathus, and the new species Oepikodus pincallyensis, are established. Acodus sp. cf. emanuelensis predominates in 35 samples from the Tabita Formation and upper beds of the underlying Yandaminta Quartzite at Mount Arrowsmith, associated with ramiform and pectiniform taxa including species of Cooperignathus, Prioniodus, Oepikodus, Erraticodon, and Baltoniodus. The Koonenberry Gap fauna is dominated by coniform species, particularly Protopanderodus nogamii, P. gradatus, and Scolopodus multicostatus. Both faunas span an age range from latest Bendigonian to Chewtonian (evae Zone); their compositional differences are probably related to slight variations in water depths and depositional environments. Species endemic to the shallow water Australian cratonic region, represented by Bergstroemognathus kirki, Triangulodus larapintinensis, Acodus sp. cf. emanuelensis and Prioniodus sp. cf. amadeus, support a correlation with Early Ordovician faunas of central and western Australia, particularly those from the lower Horn Valley Siltstone of the Amadeus Basin.
    [Show full text]
  • (Floian) Conodont Fauna from the Eastern Cordillera of Peru (Central Andean Basin) Geologica Acta: an International Earth Science Journal, Vol
    Geologica Acta: an international earth science journal ISSN: 1695-6133 [email protected] Universitat de Barcelona España GUTIÉRREZ-MARCO, J.C.; ALBANESI, G.L.; SARMIENTO, G.N.; CARLOTTO, V. An Early Ordovician (Floian) Conodont Fauna from the Eastern Cordillera of Peru (Central Andean Basin) Geologica Acta: an international earth science journal, vol. 6, núm. 2, junio, 2008, pp. 147-160 Universitat de Barcelona Barcelona, España Available in: http://www.redalyc.org/articulo.oa?id=50513115004 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Geologica Acta, Vol.6, Nº 2, June 2008, 147-160 DOI: 10.1344/105.000000248 Available online at www.geologica-acta.com An Early Ordovician (Floian) Conodont Fauna from the Eastern Cordillera of Peru (Central Andean Basin) 1 2 1 3,4 J.C. GUTIÉRREZ-MARCO G.L. ALBANESI G.N. SARMIENTO and V. CARLOTTO 1 Instituto de Geología Económica (CSIC-UCM). Facultad de Ciencias Geológicas 28040 Madrid, Spain. Gutiérrez-Marco E-mail: [email protected] Sarmiento E-mail: [email protected] 2 CONICET-CICTERRA, Museo de Paleontología Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba Casilla de Correo 1598, 5000 Córdoba, Argentina. E-mail: [email protected] 3 INGEMMET Avenida Canadá 1740, San Borja, Lima, Peru. E-mail: [email protected] 4 Departamento de Geología, Universidad Nacional San Antonio Abad del Cusco Avda. de la Cultura 733, Cuzco, Perú ABSTRACT Late Floian conodonts are recorded from a thin limestone lens intercalated in the lower part of the San José For- mation at the Carcel Puncco section (Inambari River), Eastern Cordillera of Peru.
    [Show full text]
  • Conodonts from the Andes
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CONICET Digital Publicación Especial Nº 13 ASOCIACIÓN PALEONTOLÓGICA ARGENTINA CONODONTS FROM THE ANDES Proceedings of the 3rd International Conodont Symposium & Regional Field Meeting of the IGCP project 591 Edited by Guillermo L. Albanesi and Gladys Ortega BUENOS AIRES 2013 CONODONTS FROM THE ANDES - Publicación Especial Nº 13 - Julio 2013 - PALEONTOLOGICAL NOTE EARLY ORDOVICIAN (LATE FLOIAN) CONODONTS FROM THE ZENTA RANGE, CORDILLERA ORIENTAL, NW ARGENTINA VOLDMAN, G. G.1, 2, ALBANESI, G. L. 1, 2, ZEBALLO, F. J. 1 AND MONALDI, C. R.3 1 Museo de Paleontología, CIGEA, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, X5000JJC, Córdoba, Argentina. [email protected], [email protected], [email protected] 2 CICTERRA-CONICET, Córdoba, Argentina 3 CONICET, Facultad de Ciencias Naturales, Universidad Nacional de Salta, A4449XBN, Salta, Argentina. [email protected] Keywords: Conodont. Biostratigraphy. Lower Ordovician. Cordillera Oriental. Argentina. LOWER Ordovician strata from the Central Andean Basin faunal association includes Acodus n. sp. (see Zeballo et al., this are superbly exposed in the Zenta Range of the Cordillera Ori- volume), Baltoniodus cf. triangularis, Trapezognathus? argenti- ental, NW Argentina. At the Laguna Verde section (23°18'S, nensis Rao et al.(1994), Trapezognathus diprion, Trapezognathus? 65° 1W, 4500 MASL) the sedimentary succession is mostly sili- primitivus n. sp., Scolopodus houlianzhaiensis An and Xu in An ciclastic with subordinate coquinas and calcarenites (Fig. 1). It et al. (1983), Drepanodus arcuatus Pander (1856), Drepanois- is unconformably overlain by glacial diamictites and quartzites todus chucaleznensis Albanesi and Aceñolaza (2005), D.
    [Show full text]
  • Exceptionally Preserved Conodont Apparatuses with Giant Elements from the Middle Ordovician Winneshiek Konservat-Lagerstätte, Iowa, USA
    Journal of Paleontology, 91(3), 2017, p. 493–511 Copyright © 2017, The Paleontological Society 0022-3360/16/0088-0906 doi: 10.1017/jpa.2016.155 Exceptionally preserved conodont apparatuses with giant elements from the Middle Ordovician Winneshiek Konservat-Lagerstätte, Iowa, USA Huaibao P. Liu,1 Stig M. Bergström,2 Brian J. Witzke,3 Derek E. G. Briggs,4 Robert M. McKay,1 and Annalisa Ferretti5 1Iowa Geological Survey, IIHR-Hydroscience & Engineering, University of Iowa, 340 Trowbridge Hall, Iowa City, IA 52242, USA 〈[email protected]〉; 〈[email protected]〉 2School of Earth Sciences, Division of Earth History, The Ohio State University, 125 S. Oval Mall, Columbus, Ohio 43210, USA 〈[email protected]〉 3Department of Earth and Environmental Sciences, University of Iowa, 115 Trowbridge Hall, Iowa City, IA 52242, USA 〈[email protected]〉 4Department of Geology and Geophysics, and Yale Peabody Museum of Natural History, Yale University, New Haven, CT 06520, USA 〈[email protected]〉 5Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, via Campi 103, I-41125 Modena, Italy 〈[email protected]〉 Abstract.—Considerable numbers of exceptionally preserved conodont apparatuses with hyaline elements are present in the middle-upper Darriwilian (Middle Ordovician, Whiterockian) Winneshiek Konservat-Lagerstätte in northeastern Iowa. These fossils, which are associated with a restricted biota including other conodonts, occur in fine-grained clastic sediments deposited in a meteorite impact crater. Among these conodont apparatuses, the com- mon ones are identified as Archeognathus primus Cullison, 1938 and Iowagnathus grandis new genus new species. The 6-element apparatus of A.
    [Show full text]
  • The Middle Ordovician Conodonts Eoplacognathus Robustus Bergström and E
    Andean Geology ISSN: 0718-7092 ISSN: 0718-7106 [email protected] Servicio Nacional de Geología y Minería Chile The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction Heredia, Susana; Mestre, Ana The Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction Andean Geology, vol. 46, no. 3, 2019 Servicio Nacional de Geología y Minería, Chile Available in: https://www.redalyc.org/articulo.oa?id=173961656005 This work is licensed under Creative Commons Attribution 3.0 International. PDF generated from XML JATS4R by Redalyc Project academic non-profit, developed under the open access initiative Andean Geology, 2019, vol. 46, no. 3, Septiembre, ISSN: 0718-7092 0718-7106 Research article e Middle Ordovician conodonts Eoplacognathus robustus Bergström and E. lindstroemi (Hamar): Taxonomy and apparatus reconstruction Los Conodontes Eoplacognathus robustus Bergström y E. lindstroemi (Hamar) del Ordovícico Medio: taxonomía y reconstrucción de sus aparatos Susana Heredia ¹* Redalyc: https://www.redalyc.org/articulo.oa? Universidad Nacional de San Juan, Argentina id=173961656005 [email protected] Ana Mestre ¹ Universidad Nacional de San Juan, Argentina [email protected] Received: 20 February 2018 Accepted: 21 November 2018 Abstract: e Middle-Upper Ordovician Ponón Trehué Formation cropping out in the San Rafael Block (Argentina) provided a large collection of conodonts which have been published years ago. e species Eoplacognathus robustus and Eoplacognathus lindstroemi recovered from these strata have been revised and restudied. In this contribution we describe M and S elements that were assigned previously to Baltoniodus prevariabilis and Baltoniodus variabilis as belonging to the E.
    [Show full text]
  • Lower Paleozoic
    Paleozoic Time Scale and Sea-Level History Sponsored, in part, by: Time ScaLe R Creator Updated by James G. Ogg (Purdue University) and Gabi Ogg to: GEOLOGIC TIME SCALE 2004 Cen Mesozoic (Gradstein, F.M., Ogg, J.G., Smith, A.G., et al.2004) Paleozoic ICS Precambrian and The Concise Geologic Time Scale (Ogg, J.G., Ogg, G. & Gradstein, F.M., 2008) Paleozoic Sequences -- Haq and Schutter (Science, 2008) Geo- magnetic Standard Chronostratigraphy Mega- Sequences Coastal Onlap and Mean Sea- Paleozoic Long- and Silurian-Ordovician Ordovician Trilobite Zones and Polarity Sequences (nomenclature by Level (intermediate term) Short-Term Sea Level Sea Level Sealevel Events major Cambrian events Conodont Zonation Graptolite Zonation Age Period Epoch Stage Primary of Sloss J. Ogg) 0 100 200m 0 100 200m 0 100 200m (Baltoscandia) South China 416.1 Monograptus bouceki - Oulodus elegans detortus transgrediens - perneri Silur-8 Monograptus branikensis - Pri-1 417.5 lochkovensis 418.02 Ozarkodina remscheidensis Pridoli Interval Zone Monograptus parultimus - ultimus 418.7 Lud-3 419.0 Ozarkodina crispa Monograptus formosus 419.75 Silur-7 Ozarkodina snajdri Interval Zone Neocucullograptus kozlowskii - 420 Ludfordian Ludlow-Pridoli Polonograptus podoliensis Lud-2 420.5 420.7 Polygnathoides siluricus mixed-polarity interval 421.0 Saetograptus leintwardinensis 421.3 Lud-1 Ancoradella ploeckensis Ludlow Lobograptus scanicus Gorstian 422.0 Silur-6 [ not zoned ] 422.9 Kockelella stauros Neodiversograptus nilssoni Gor-1 423.0 Colonograptus ludensis Colonograptus praedeubeli
    [Show full text]
  • Ordovician Conodont Biofacies of the Upper La Silla and San Juan Formations (Middle Tremadocian-Lower Dapingian) at Cerro La Silla, Argentine Precordillera
    comptes rendus palevol 2021 20 35 DIRECTEURS DE LA PUBLICATION / PUBLICATION DIRECTORS : Bruno David, Président du Muséum national d’Histoire naturelle Étienne Ghys, Secrétaire perpétuel de l’Académie des sciences RÉDACTEURS EN CHEF / EDITORS-IN-CHIEF : Michel Laurin (CNRS), Philippe Taquet (Académie des sciences) ASSISTANTE DE RÉDACTION / ASSISTANT EDITOR : Adenise Lopes (Académie des sciences ; [email protected]) MISE EN PAGE / PAGE LAYOUT : Audrina Neveu (Muséum national d’Histoire naturelle ; [email protected]) RÉVISIONS LINGUISTIQUES DES TEXTES ANGLAIS / ENGLISH LANGUAGE REVISIONS : Kevin Padian (University of California at Berkeley) RÉDACTEURS ASSOCIÉS / ASSOCIATE EDITORS (*, took charge of the editorial process of the article/a pris en charge le suivi éditorial de l’article) : Micropaléontologie/Micropalaeontology Maria Rose Petrizzo (Università di Milano, Milano) Paléobotanique/Palaeobotany Cyrille Prestianni (Royal Belgian Institute of Natural Sciences, Brussels) Métazoaires/Metazoa Annalisa Ferretti* (Università di Modena e Reggio Emilia, Modena) Paléoichthyologie/Palaeoichthyology Philippe Janvier (Muséum national d’Histoire naturelle, Académie des sciences, Paris) Amniotes du Mésozoïque/Mesozoic amniotes Hans-Dieter Sues (Smithsonian National Museum of Natural History, Washington) Tortues/Turtles Juliana Sterli (CONICET, Museo Paleontológico Egidio Feruglio, Trelew) Lépidosauromorphes/Lepidosauromorphs Hussam Zaher (Universidade de São Paulo) Oiseaux/Birds Eric Buffetaut (CNRS, École Normale Supérieure, Paris)
    [Show full text]
  • Dhanda, R., Murdock, DJE, Repetski, JE, Donoghue, PCJ, & Smith, MP
    Dhanda, R., Murdock, D. J. E., Repetski, J. E., Donoghue, P. C. J., & Smith, M. P. (2019). The apparatus composition and architecture of Erismodus quadridactylus and the implications for element homology in prioniodinin conodonts. Papers in Palaeontology, 5(4), 657-677. https://doi.org/10.1002/spp2.1257 Peer reviewed version Link to published version (if available): 10.1002/spp2.1257 Link to publication record in Explore Bristol Research PDF-document This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at https://onlinelibrary.wiley.com/doi/full/10.1002/spp2.1257 . Please refer to any applicable terms of use of the publisher. University of Bristol - Explore Bristol Research General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/red/research-policy/pure/user-guides/ebr-terms/ THE APPARATUS COMPOSITION AND ARCHITECTURE OF ERISMODUS QUADRIDACTYLUS AND THE IMPLICATIONS FOR ELEMENT HOMOLOGY IN PRIONIODININ CONODONTS By ROSIE DHANDA1, DUNCAN J. E. MURDOCK2, JOHN E. REPETSKI3 and PHILIP C. J. DONOGHUE4 and M. PAUL SMITH2 * 1School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; [email protected] 2 Oxford University Museum of Natural History, Parks Road, Oxford, OX1 3PW, UK; [email protected], [email protected] 3 U.S. Geological Survey, MS 926A
    [Show full text]