DOCSLIB.ORG

Microvertebrates from the Silurian–Devonian Boundary Beds of the Eastport Formation, Maine, Eastern USA Susan Turner and Carole J

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Microvertebrates from the Silurian–Devonian Boundary Beds of the Eastport Formation, Maine, Eastern USA Susan Turner and Carole J Document generated on 10/01/2021 2:55 a.m. Atlantic Geology Journal of the Atlantic Geoscience Society Revue de la Société Géoscientifique de l'Atlantique Microvertebrates from the Silurian–Devonian boundary beds of the Eastport Formation, Maine, eastern USA Susan Turner and Carole J. Burrow Volume 54, 2018 Article abstract Agnathan and gnathostome remains, associated with lingulid brachiopod URI: https://id.erudit.org/iderudit/1055415ar fragments and distinctive ostracods, have been extracted from a small DOI: https://doi.org/10.4138/atlgeol.2018.006 calcareous mudstone sample collected from the type section of the Eastport Formation on the northern shore of Moose Island, Maine. The vertebrate See table of contents assemblage includes osteostracan, anaspid, and thelodont scales, and acanthodian scales, spines and teeth, which support a late Pridoli, or possibly earliest Lochkovian, age for the stratum. The thelodont Paralogania denisoni n. Publisher(s) sp. is described, associated with a single thelodont scale referred tentatively to Talivalia? sp. indet., and acanthodians Nostolepis striata, Gomphonchus Atlantic Geoscience Society sandelensis, and Poracanthodes punctatus in a fauna that shows similarities to late Pridoli assemblages in Britain, parts of Europe, Russia, Greenland, and ISSN arctic Canada. 0843-5561 (print) 1718-7885 (digital) Explore this journal Cite this article Turner, S. & Burrow, C. (2018). Microvertebrates from the Silurian–Devonian boundary beds of the Eastport Formation, Maine, eastern USA. Atlantic Geology, 54, 171–187. https://doi.org/10.4138/atlgeol.2018.006 All Rights Reserved ©, 2018 Atlantic Geology This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research. https://www.erudit.org/en/ Microvertebrates from the Silurian–Devonian boundary beds of the Eastport Formation, Maine, eastern USA Susan Turner and Carole J. Burrow* Geosciences, Queensland Museum, 122 Gerler Road, Hendra, Queensland 4011, Australia *Corresponding author <[email protected]> Date received: 13 November 2017 ¶ Date accepted: 27 January 2018 ABSTRACT Agnathan and gnathostome remains, associated with lingulid brachiopod fragments and distinctive ostracods, have been extracted from a small calcareous mudstone sample collected from the type section of the Eastport Formation on the northern shore of Moose Island, Maine. The vertebrate assemblage includes osteostracan, anaspid, and thelodont scales, and acanthodian scales, spines and teeth, which support a late Pridoli, or possibly earliest Lochkovian, age for the stratum. The thelodont Paralogania denisoni n. sp. is described, associated with a single thelodont scale referred tentatively to Talivalia? sp. indet., and acanthodians Nostolepis striata, Gomphonchus sandelensis, and Poracanthodes punctatus in a fauna that shows similarities to late Pridoli assemblages in Britain, parts of Europe, Russia, Greenland, and arctic Canada. RÉSUMÉ Les restes d’agnathes et de gnathostomes, associés à des fragments de brachiopodes lingulidés et à des ostracodes distinctifs, ont été extraits d’un petit échantillon de mudstone calcaire prélevé de la section type de la formation d’Eastport sur la côte nord de Moose Island, dans le Maine. L’ ensemble d’animaux vertébrés comprend les ostéostracés, les anaspides, les écailles de thélodontes et les écailles, épines dorsales et dents d’acanthodiens, ce qui laisse penser que la strate date du Pridoli tardif ou du Lochkovien précoce. Le Paralogania denisoni n. sp. de thélodonte est décrit, en lien avec une seule écaille de thélodonte provisoirement appelée Talivalia? sp. indet., de même que les Nostolepis striata, Gomphonchus sandelensis et Poracanthodes punctatus d’acanthodiens, dans une faune qui montre des similarités avec des assemblages du Pridoli tardif de Grande-Bretagne, d’autres parties d’Europe, de Russie, du Groenland et de l’Arctique canadien. [Traduit par la redaction] INTRODUCTION a possible loganiid scale, was also reported from the Pridoli Dekker Formation (K. Denkler, pers. comm. to ST, 1990s, Few Silurian vertebrate sites have been described from unconfirmed record). Turner et al. (1999) discovered older the USA, and even fewer have been studied for vertebrate early Silurian microfossils of the thelodont Zuegelepis pota- microfossils (hereafter microvertebrates) such as thelodont nos from Illinois. Few other microvertebrate occurrences and acanthodian remains. The first record was of fin spines are known from the Silurian of the United States east coast; and heterostracans from Pennsylvania by Claypole (1884, other possible records (e.g., Turner 1999), such as Thelodus 1885); he assigned the fin spines (“small spines apparently sp. from Maryland, are also yet to be verified. of Selachian fish”: Claypole 1885, p. 426) to Onchus clintoni Abundant microvertebrate faunas have been described (Llandovery) and Onchus pennsylvanicus (Pridoli), and the from arctic Canadian localities, particularly of thelodont as- poraspidid heterostracan shields and scales to Palaeaspis semblages (e.g., Märss et al. 2007), with rarer descriptions americana and Palaeaspis bitruncata. Other records from of late Silurian to Early Devonian acanthodians (Spjeldnaes Pennsylvania were published by DeWindt (1974), who de- 1967; Vieth 1980; Burrow et al. 1999; Burrow 2013). From scribed purported acanthodian scales (actually thelodont eastern Canada, tolypelepid and corvaspid heterostracans scales) from upper Silurian beds of the Bloomsburg Forma- have been reported from the middle Silurian Eramosa La- tion, central Pennsylvania, and Giffin (1979), who published gerstätte, Ontario (von Bitter et al. 2007). From the late a full description of the thelodont scales from the same beds; Silurian, Turner (1986) redescribed the only known artic- her material is currently being re-assessed. One thelodont, ulated material of the thelodont type genus Thelodus and ATLANTIC GEOLOGY 54, 171–187 (2018) doi:10.4138/atlgeol.2018.006 Copyright © Atlantic Geology, 2018 0843-5561|18|00171–187$3.55|0 ATLANTIC GEOLOGY · VOLUME 54 · 2018 172 identified a Paralogania, as well as an acanthodian, from that extends from Massachusetts, USA, into New Bruns- the Cunningham Creek Formation of southern New Bruns- wick, Canada (Fig. 2); the type locality is at Moose Island, wick; and Burrow (2011) described the latter as a new acan- Hancock County, Maine (Bastin and Williams 1914). The thodian Nerepisacanthus denisoni from the nodule horizon. formation extends for more than 500 km, and is approxi- Burrow et al. (2013) redescribed a microvertebrate fauna, mately 2440 m thick in Maine according to Bastin and including thelodonts and acanthodians, from the upper Si- Williams (1914). The Eastport Formation is in a complex lurian outcrops at Arisaig, Nova Scotia (first described by stratigraphic setting, with subareal volcanic rocks and shal- Legault 1968), and Burrow and Rudkin (2014) described an low-water sedimentary rocks. Sedimentary rocks include: articulated specimen of Nerepisacanthus denisoni from the red siltstone; fine- to medium-grained sandstone; dark grey Bertie Formation of Ontario. Blaise et al. (1990, 1991) also to green mudstone, siltstone and sandstone some with cal- recorded Thelodus parvidens and undetermined acanthodi- careous content; minor red polymictic conglomerate; and an scales from late Silurian sites in the Meguma terrane of volcaniclastics. This succession represents deposition in a Nova Scotia. low-energy, peritidal environment, with volcanic rocks in- Relatively few middle Paleozoic fish remains are known tercalated throughout the formation, predominating over from Maine (Churchill-Dickson 2004). Bastin and Wil- the sedimentary rocks. liams (1914) mentioned a fish spine in a calcareous nodule The Silurian succession in the coastal volcanic belt of from the Eastport Formation, and the acanthodian Nosto Maine exhibits strong similarities to European Silurian se- lepis sp. was recorded informally by Robert Denison (Chur- quences, a fact that troubled pre-continental-drift workers chill-Dickson 2004, table 1). Churchill-Dickson (2007) (Churchill-Dickson 2004). Previously the age of this suc- reviewed vertebrate records from the Silurian–Devonian cession had been regarded as wholly Early Devonian (Loc- of Maine, noting Silurian records of ‘fish teeth’ (probably hkovian or Pragian), based principally on an undescribed conodonts) from the Edmunds Formation and acanthodian ostracod, which Berdan (1990) considered to belong to a spines from the Ames Knob Formation, as well as Devonian quadrilobate beyrichiacean form allied to Cornikloedenina; placoderm remains (‘Asterolepis’) from the Chapman Sand- but it is more like Carinokloedenia from the Pragian of Pod- stone. To date, other than the Denison material noted below, olia and the Lochkovian of northern France. Subsequently, we have been unable to track down any of the vertebrate careful analysis of the known fossil data led Churchill-Dick- specimens previously reported. son (2004) to conclude that the Eastport Formation is late Here we describe the microvertebrates from a sample Silurian (Pridoli) in age, an interpretation
Load more

Recommended publications
  • Copyrighted Material
    06_250317 part1-3.qxd 12/13/05 7:32 PM Page 15 Phylum Chordata Chordates are placed in the superphylum Deuterostomia. The possible rela- tionships of the chordates and deuterostomes to other metazoans are dis- cussed in Halanych (2004). He restricts the taxon of deuterostomes to the chordates and their proposed immediate sister group, a taxon comprising the hemichordates, echinoderms, and the wormlike Xenoturbella. The phylum Chordata has been used by most recent workers to encompass members of the subphyla Urochordata (tunicates or sea-squirts), Cephalochordata (lancelets), and Craniata (fishes, amphibians, reptiles, birds, and mammals). The Cephalochordata and Craniata form a mono- phyletic group (e.g., Cameron et al., 2000; Halanych, 2004). Much disagree- ment exists concerning the interrelationships and classification of the Chordata, and the inclusion of the urochordates as sister to the cephalochor- dates and craniates is not as broadly held as the sister-group relationship of cephalochordates and craniates (Halanych, 2004). Many excitingCOPYRIGHTED fossil finds in recent years MATERIAL reveal what the first fishes may have looked like, and these finds push the fossil record of fishes back into the early Cambrian, far further back than previously known. There is still much difference of opinion on the phylogenetic position of these new Cambrian species, and many new discoveries and changes in early fish systematics may be expected over the next decade. As noted by Halanych (2004), D.-G. (D.) Shu and collaborators have discovered fossil ascidians (e.g., Cheungkongella), cephalochordate-like yunnanozoans (Haikouella and Yunnanozoon), and jaw- less craniates (Myllokunmingia, and its junior synonym Haikouichthys) over the 15 06_250317 part1-3.qxd 12/13/05 7:32 PM Page 16 16 Fishes of the World last few years that push the origins of these three major taxa at least into the Lower Cambrian (approximately 530–540 million years ago).
    [Show full text]
  • Ludlow, Silurian) Positive Carbon Isotope Excursion in the Type Ludlow Area, Shropshire, England?
    At what stratigraphical level is the mid Ludfordian (Ludlow, Silurian) positive carbon isotope excursion in the type Ludlow area, Shropshire, England? DAVID K. LOYDELL & JIØÍ FRÝDA The balance of evidence suggests that the mid Ludfordian positive carbon isotope excursion (CIE) commences in the Ludlow area, England in the uppermost Upper Whitcliffe Formation, with the excursion continuing into at least the Platyschisma Shale Member of the overlying Downton Castle Sandstone Formation. The Ludlow Bone Bed Member, at the base of the Downton Castle Sandstone Formation has previously been considered to be of Přídolí age. Conodont and 13 thelodont evidence, however, are consistent with the mid Ludfordian age proposed here. New δ Corg data are presented from Weir Quarry, W of Ludlow, showing a pronounced positive excursion commencing in the uppermost Upper Whitcliffe Formation, in strata with a palynologically very strong marine influence. Elsewhere in the world, the mid Ludfordian positive CIE is associated with major facies changes indicated shallowing; the lithofacies evidence from the Ludlow area is consistent with this. There appears not to be a major stratigraphical break at the base of the Ludlow Bone Bed Member. • Key words: Silurian, Ludlow, carbon isotopes, conodonts, chitinozoans, thelodonts, stratigraphy. LOYDELL, D.K. & FRÝDA, J. 2011. At what stratigraphical level is the mid Ludfordian (Ludlow, Silurian) positive car- bon isotope excursion in the type Ludlow area, Shropshire, England? Bulletin of Geosciences 86(2), 197–208 (5 figures, 2 tables). Czech Geological Survey, Prague. ISSN 1214-1119. Manuscript received January 17, 2011; accepted in re- vised form March 28, 2011; published online April 13, 2011; issued June 20, 2011.
    [Show full text]
  • Annual Meeting 2002
    Newsletter 51 74 Newsletter 51 75 The Palaeontological Association 46th Annual Meeting 15th–18th December 2002 University of Cambridge ABSTRACTS Newsletter 51 76 ANNUAL MEETING ANNUAL MEETING Newsletter 51 77 Holocene reef structure and growth at Mavra Litharia, southern coast of Gulf of Corinth, Oral presentations Greece: a simple reef with a complex message Steve Kershaw and Li Guo Oral presentations will take place in the Physiology Lecture Theatre and, for the parallel sessions at 11:00–1:00, in the Tilley Lecture Theatre. Each presentation will run for a New perspectives in palaeoscolecidans maximum of 15 minutes, including questions. Those presentations marked with an asterisk Oliver Lehnert and Petr Kraft (*) are being considered for the President’s Award (best oral presentation by a member of the MONDAY 11:00—Non-marine Palaeontology A (parallel) Palaeontological Association under the age of thirty). Guts and Gizzard Stones, Unusual Preservation in Scottish Middle Devonian Fishes Timetable for oral presentations R.G. Davidson and N.H. Trewin *The use of ichnofossils as a tool for high-resolution palaeoenvironmental analysis in a MONDAY 9:00 lower Old Red Sandstone sequence (late Silurian Ringerike Group, Oslo Region, Norway) Neil Davies Affinity of the earliest bilaterian embryos The harvestman fossil record Xiping Dong and Philip Donoghue Jason A. Dunlop Calamari catastrophe A New Trigonotarbid Arachnid from the Early Devonian Windyfield Chert, Rhynie, Philip Wilby, John Hudson, Roy Clements and Neville Hollingworth Aberdeenshire, Scotland Tantalizing fragments of the earliest land plants Steve R. Fayers and Nigel H. Trewin Charles H. Wellman *Molecular preservation of upper Miocene fossil leaves from the Ardeche, France: Use of Morphometrics to Identify Character States implications for kerogen formation Norman MacLeod S.
    [Show full text]
  • Evolution of the Earliest Palaeozoic Vertebrates 69 © Lietuvos Mokslų Akademijos Leidykla, 2006
    GEOLOGIJA. 2006. T. 54. P. 69–75 © Lietuvos mokslų akademija, 2006Discoveries: evolution of the earliest Palaeozoic vertebrates 69 © Lietuvos mokslų akademijos leidykla, 2006 Paleozoologija • Paleozoology • Палеозоология Discoveries: evolution of the earliest Palaeozoic vertebrates Algimantas Grigelis, Grigelis A., Turner S. Discoveries: evolution of the earliest Palaeozoic vertebrates. Geologija. Vilnius. 2006. No. 54. P. 69–75. ISSN 1392-110X. Susan Turner Researches of the Devonian and Silurian geology and palaeontology in all of Northern Eurasia performed in latest twenty years are of great importance for better understanding of evolution of the earliest Palaeozoic vertebrates. Palaeoichthyologists have discovered and described many new taxa belonging to the Thelodonti, Tesako- viaspidida, Heterostraci, Osteostraci, Monogolepidida, Chondrichthyes, and Acanthodii. Dr. Habil. Valentina Karatajūtė-Talimaa (Vilnius, Lithuania) and her colleagues took part in a large international team which compiled the Silurian and Devonian biozona- tion schemes based on the research data on the Palaeozoic microvertebrates. The IGCP project No. 328 Palaeozoic Microverterbrates was devoted to this work and its results were approved in 2000 by the International Devonian Stratigraphic Commission. In the last several years V. Karatajūtė-Talimaa’s work has been devoted to the thelodonts, heterostracans and acanthodians of the Ordovician and Lower Silurian and Lower–Upper Devonian of the Russian Arctic, Severnaya Zemlya Archipelago, and Siberian Plate. The most important achievement of recent years is the detection of a new type of bone tissue and description of a new Upper Ordovician–Lower Silurian vertebrate order, Tesakoviaspidida n. ord. Karatajute-Talimaa, Smith, 2004, that was distinguished after a new type of dentinous tissue without dentine canals, and the recognition of a major group of early shark-like vertebrates, the Mongolepidida.
    [Show full text]
  • Ordovician and Lower Silurian Thelodonts from Severnaya Zemlya Archipelago (Russia)
    Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia) Tiiu MÄRSS Institute of Geology, Tallinn Technical University, 7 Estonia Avenue, Tallinn 10143 (Estonia) [email protected] Valentina KARATAJŪTĒ-TALIMAA Institute of Geology of Lithuania, S˘ evc˘ enkos 13, Vilnius LR 2600 (Lithuania) [email protected] Märss T. & Karatajūtē-Talimaa V. 2002. — Ordovician and Lower Silurian thelodonts from 406 Severnaya Zemlya Archipelago (Russia). Geodiversitas 24 (2) : 381-404. ABSTRACT Six new and one earlier known thelodont from the Ordovician and Lower Silurian of Severnaya Zemlya Archipelago are described. Scales of the earliest dated thelodont Stroinolepis maenniki n. gen., n. sp. were obtained from the Strojnaya River section, October Revolution Island, upper Ozernaya and Strojnaya formations, Middle-Upper and Upper Ordovician, correspond- ingly. Loganellia matura n. sp. was found from the Srednii Island, KEY WORDS Agnatha, Golomyannyj Formation, middle Llandovery. Paralogania klubovi n. sp. Thelodonti, and Loganelliidae gen. et sp. indet. come from the middle(?) Llandovery of Middle-Upper Ordovician, Upper Ordovician, Pioneer Island. L. grossi Fredholm, 1990 in the Matusevich River section, Lower Silurian, Paralogania consimilis n. sp. and Thelodus calvus n. sp. in the Ushakov River Severnaya Zemlya Archipelago, section, and Shielia multispinata n. sp., in the Spokojnaya River section, are Russia, scale morphology, distributed in the Samojlovich Formation, Wenlock, Lower Silurian of histology. October Revolution Island. GEODIVERSITAS • 2002 • 24 (2) © Publications Scientifiques du Muséum national d’Histoire naturelle, Paris. www.mnhn.fr/publication/ 381 Märss T. & Karatajūtē-Talimaa V. RÉSUMÉ Thélodontes de l’Ordovicien et du Silurien inférieur de l’Archipel de Severnaya Zemlya (Russie). Six thélodontes nouveaux et une forme déjà connue de l’Ordovicien et du Silurien de l’Archipel de Severnaya Zemlya sont décrits.
    [Show full text]
  • Revision of Silurian Vertebrate Biozones and Their Correlation with the Conodont Succession
    Estonian Journal of Earth Sciences, 2013, 62, 4, 181–204 doi: 10.3176/earth.2013.15 Revision of Silurian vertebrate biozones and their correlation with the conodont succession Tiiu Märss and Peep Männik Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; [email protected], [email protected] Received 18 July 2012, accepted 26 October 2012 Abstract. The first vertebrate-based subdivisions of Silurian strata were mainly drawn on material from outcrops in Britain and drill cores from the southern Baltic. Nearly twenty years ago the first vertebrate biozonal scheme was developed on the basis of vertebrate distribution in several continuous drill core sections in the northern Baltic. This paper presents a new scheme in which many new data on vertebrate distribution from the Baltica (Baltic region, NW Russia), Avalonia (southern Britain, eastern Canada), Laurentia (northern Canada, Greenland, Scotland) and Kara (Arctic Russia) palaeocontinents have been used. All the zones have been defined, and the geographical distribution and the reference stratum and locality for each zone have been given. The Llandovery part of the succession contains the Valyalepis crista, Loganellia aldridgei and L. scotica zones; the Wenlock part is represented by the Archipelepis bifurcata/Arch. turbinata, L. grossi, Overia adraini, L. einari and Paralogania martinssoni zones. The Par. martinssoni Zone continues in the Ludlow and is followed by the Phlebolepis ornata, Phl. elegans, Andreolepis hedei, Thelodus sculptilis and T. admirabilis zones. The last zone continues in the lower Přidoli and is followed by the Nostolepis gracilis, Poracanthodes punctatus and Trimerolepis timanica zones. The L.
    [Show full text]
  • Paralogania from the Rootsiküla (Wenlock) and Paadla (Ludlow) Stages of Estonia
    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/261092881 Paralogania from the Rootsiküla (Wenlock) and Paadla (Ludlow) stages of Estonia Article in Proceedings of the Estonian Academy of Sciences · June 2003 CITATIONS READS 9 72 1 author: Tiiu Märss Tallinn University of Technology 98 PUBLICATIONS 1,052 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Palaeozoic Thelodonti View project Silurian and Devonian vertebrate microremains View project All content following this page was uploaded by Tiiu Märss on 26 March 2014. The user has requested enhancement of the downloaded file. Proc. Estonian Acad. Sci. Geol., 2003, 52, 2, 98–112 Paralogania from the Rootsiküla (Wenlock) and Paadla (Ludlow) stages of Estonia Tiiu Märss Institute of Geology, Tallinn Technical University, Estonia pst. 7, 10143 Tallinn, Estonia; [email protected] Received 3 May 2002, in revised form 18 June 2002 Abstract. Paralogania species in the Rootsiküla (Wenlock) and Paadla (Ludlow) stages from Saaremaa Island, Estonia, were re-studied. Extremely well preserved scales of P. martinssoni (Gross) were described from Silma Cliff (Himmiste Beds of the Paadla Stage) and compared with the scales from Vesiku Brook (Vesiku Beds of the Rootsiküla Stage), the type locality of the species. Paralogania kaarmisensis sp. nov. was established on the basis of relatively large, strongly elongate scales carrying a row of very fine spines laterally of the crown; the scales have one to two fine oblique ridges above the row of spines. The new species has a short range in the Phlebolepis elegans Biozone (Ludlow, Upper Silurian).
    [Show full text]
  • Silurian Vertebrate Remains from the Oslo Region, Norway, and Their Implications for Regional Biostratigraphy
    NORWEGIAN JOURNAL OF GEOLOGY Vol 99 Nr. 1 https://dx.doi.org/10.17850/njg99-1-07 Silurian vertebrate remains from the Oslo Region, Norway, and their implications for regional biostratigraphy Oskar Bremer1, Susan Turner2, Tiiu Märss3 & Henning Blom1 1Uppsala University, Department of Organismal Biology, Norbyvägen 18A, 752 36, Uppsala, Sweden. 2Honorary Research Fellow, Queensland Museum Geosciences, 122 Gerler Road, Hendra, Queensland 4011, Australia. 3Department of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia. E-mail corresponding author (Oskar Bremer): [email protected]. Several vertebrate assemblages are described from the Silurian of the Oslo Region, Norway, based on the review and revision of previous reports of microremains, as well as unpublished material from museum collections. Articulated thelodont specimens from the Rudstangen Fauna, Ringerike Group, are also described here for the first time, revealing a seemingly monogeneric loganelliid assemblage. The oldest assemblage (mid-Llandovery) only contains the thelodont Loganellia cf. aldridgei, while a single sample from upper Llandovery strata produced four Thelodus sp. scales. These scales share features with those from younger Thelodus taxa and give additional support to an early appearance of this genus. The mid-Wenlock faunas consist of thelodonts Loganellia grossi, Loganellia einari and Thelodus laevis. These are joined by the thelodont Paralogania martinssoni, anaspids Rhyncholepis parvula and cf. Pterygolepis nitida, as well as the osteostracans cf. Tyriaspis whitei and Osteostraci gen. et sp. indet. in late Wenlock and earliest Ludlow faunas. These complement the previously described anaspids and osteostracans of the Rudstangen Fauna based on articulated specimens. The faunas of a number of calcarenite samples collectively contain the thelodonts L.
    [Show full text]
  • Download Full Article in PDF Format
    Upper Silurian thelodonts from Severnaya Zemlya Archipelago (Russia) Valentina KARATAJŪTĒ-TALIMAA Institute of Geology of Lithuania, S˘ evc˘ enkos 13, Vilnius LR 2600 (Lithuania) [email protected] Tiiu MÄRSS Institute of Geology, Tallinn Technical University, 7 Estonia Avenue, Tallinn 10143 (Estonia) [email protected] Karatajūtē-Talimaa V. & Märss T. 2002. — Upper Silurian thelodonts from Severnaya 406 Zemlya Archipelago (Russia). Geodiversitas 24 (2) : 405-443. ABSTRACT Thelodonts have been found in the Bol’shaya, Matusevich, Obryvistaya, Pod”emnaya, Spokojnaya, Ushakov rivers and Cape October sections of October Revolution Island, and Komsomolets and Pioneer islands sections, Severnaya Zemlya Archipelago, Russia. Two new families, one new genus and six new species belonging to the orders Katoporida and Thelodontida are described from the Upper Silurian. Seven taxa are re-described. Scattered scales of Loganellia cuneata (Gross, 1947), Paralogania ex gr. martinssoni (Gross, 1967), Paralogania menneri n. sp., Valiukia flabellata n. gen., n. sp., Phlebolepis elegans Pander, 1856, Thelodus visvaldi n. sp., Thelodus matukhini n. sp., Thelodus ex gr. schmidti (Pander, 1856), Thelodus sp. indet. and Lanarkia? sp. are characteristic for the Ludlow part of the sequence (Ust-Spokojnaya Formation of October Revolution Island and its analogue on Pioneer and Komsomolets islands). Thelodus parvidens(?), Loganellia cuneata, Paralogania wilsoni n. sp., P. kachanovi n. sp., Paralogania sp. cf. ū ē KEY WORDS P. borealis (Karataj t -Talimaa, 1978), Goniporus alatus (Gross, 1947) and Thelodonti, Nikolivia elongata Karatajūtē-Talimaa, 1978 are distributed in the sections Upper Silurian, of Krasnaya Bukhta Formation on October Revolution Island and coeval Severnaya Zemlya Archipelago, scale morphology, strata of Pioneer Island (Pridoli).
    [Show full text]
  • Newsletter Number 51
    The Palaeontology Newsletter Contents 51 Association Business 3 News 4 Meeting Reports 11 Association Meetings 16, 21, 33, 40 Sylvester-Bradley Award Report 18 Correspondence 22 Future meetings of other bodies 34 Book Reviews 41 Post-graduate opportunities 64 Palaeontology vol 45 parts 6 74 ANNUAL MEETING abstracts 75 Reminder: The deadline for copy for Issue no 52 is 12th February 2003 On the Web: http://www.palass.org/ Newsletter 51 3 Association Business Sylvester-Bradley Awards Awards are made to assist palaeontological research (travel, visits to museums, fi eldwork etc.), with each award having a maximum value of £1,000. Preference is given to applications for a single purpose (rather than top-ups of other grant applications) and no defi nite age limit is applied, although some preference may be given to younger applicants or those at the start of their careers. The award is open to both amateur and professional palaeontologists, but preference will be given to members of the Association. The deadline for applications is the 30th November 2002, with awards announced at the AGM. Applications consist of a CV, one A4 page account of research aims and objectives, and a breakdown of the proposed expenditure. Each application should be accompanied by the names of a personal and scientifi c referee. Successful candidates must produce a report for Palaeontology Newsletter and are asked to consider the Association’s meetings and publications as media for conveying the research results. 2002 Association Awards and Annual Address to be made at the Annual Meeting. 2002 Hodson Fund Award winner Dr Matthew A.
    [Show full text]
  • Fishes of the World
    Fishes of the World Fishes of the World Fifth Edition Joseph S. Nelson Terry C. Grande Mark V. H. Wilson Cover image: Mark V. H. Wilson Cover design: Wiley This book is printed on acid-free paper. Copyright © 2016 by John Wiley & Sons, Inc. All rights reserved. Published by John Wiley & Sons, Inc., Hoboken, New Jersey. Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at www.wiley.com/go/permissions. Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with the respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be createdor extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation.
    [Show full text]
  • A Unique Late Silurian Thelodus Squamation from Saaremaa (Estonia) and Its Ontogenetic Development
    Estonian Journal of Earth Sciences, 2011, 60, 3, 137–146 doi: 10.3176/earth.2011.3.02 A unique Late Silurian Thelodus squamation from Saaremaa (Estonia) and its ontogenetic development Tiiu Märss Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; [email protected] Received 5 April 2011, accepted 10 June 2011 Abstract. A partly preserved squamation of Thelodus laevis (Pander) from the Himmiste outcrop (Saaremaa Island, Estonia) is described. Most of the trunk with a pectoral fin fragment and three fragments of posterior fins are present, while part of the head and the caudal fin are absent. Ontogenetic development of the scale cover of T. laevis is explained by comparing it with the squamation of Lanarkia horrida Traquair, Loganellia scotica (Traquair) and a modern fish. It is supposed that newly forming trunk scales of early juvenile Thelodus were smooth and rhomboidal. When the individual grew, ridged scales were added between smooth ones in irregular rows in the posterior part of the trunk. Adult individuals were covered with species-specific scales with particular morphology and sculpture of the crown. Co-occurrence of smooth and ridged scales on the trunk in the specimen studied corresponds to a young stage of ontogeny. Key words: Thelodus, Thelodonti, squamation, ontogeny, Late Silurian, Estonia. INTRODUCTION horizontal microlamination. In origin, the sediment represents quiet-lagoonal dolomitic mudstone with the During the study of Estonian Silurian osteostracans and admixture of more clay material (Aaloe 1963; Märss et the thelodont Phlebolepis elegans Pander in the Geological al. 2003). Museum at the University of Tartu, material found by Twenty-four thelodont species, represented by well- Edmund Bölau at the time of the 2nd World War in the preserved squamations, and three species having smaller Himmiste Quarry, Saaremaa Island, caught my attention.
    [Show full text]