Aspects of the Ordovician System PDF
Preview Aspects of the Ordovician System
N.Atlantic � BritiSsehr ies tiantGirca ptz.o nesB altSiecr ieNs. AmericaSne riesC onodonzto nes persculplus ------- extraordinarius ASHGILL anceps Amorphognathus ordovicicus HARJU camplanatus CINCINNAT IAN linearis Amorphognathus e/ingan i superbus CARADO C multidens Amorphognathus tvaerensis VIRU gracili s CHAMPLAINIAN Pygnodus LLANDEILO anserinus tereti usculus Pygodus serrus murchison i E.suecicus LLANVIRN E.v ariabi/is 'bifidus' M.parva B.navis hir unda B.triangularis ARENIG extensus Oepikodus evae P.e legans O EL AND CANADIAN ? P.proteus P.deltifer ? Cangulatus TREMADOC Dictyonema spp. ? earrelatiooftn h eB ritiBsahl.t aincd N ortAhm ericasne riweist ht heA tlantgriacp tolei atn dc onodotnz ones. Modifiefdr omB ergstr1ö9m77 andJ aanuss1o9n79 . Aspects of the Ordovician System Aspects of the Ordovician System Edited by: DA VID BRUTON L. Palaeontological Contributions from the University of Oslo, No. 295 Universitetsforlaget Oslo -Bergen -Stavanger-Troms� © Universitetsforlaget 1984 ISBN 82-00-06319-4 Printed in Norway by Foto-Trykk, Trogstad Contents Editorial Introduction.W hat is so special about the Ordovician? By V. Jaanusson Stratigraphical Fraruework The Ordavieian Time Scale -New Refinements.By R. J. Ross Jr. and C W. Naeser . . . . . . . 5 39 40 Ar/ Ar Age Spectrum Dating of Biotite from Middle Ordavieian Bentonit es, Eastem North America.B y M. J. Kunk and J. F. Sutter . . . . . . . . . . . . . . . . . . 11 Graphic earrelation of upper Middle and Upper Ordavieian rocks, North American Midcontinent Province, U.S.A.By W. C. Sweet . ... .. . . .... .. ... ... 23 Ordovician Sea Level Changes Global earlier Ordavieian transgressions and regressions and their biological implications.By R. A. Fortey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Early Ordavieian eustatic events in Canada.By C. R. Bames . . . . . . . . . . . . . . . . . . . . . . . 51 Late Ordavieian environmental changes and their effect on faunas.By P. J. Brenchley and the late G. Newall . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Ordovician Climate The Ordavieian elimate based on the study of carbonate rocks.By M. Lindström . . . . . . . . . 81 Ordavieian reefs and elimate: a review.By B. D. We b by . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Ordovician Shelly Environments Distribution of the Himantia fauna and its meaning.By Jia-yu Ron g ..... .. .... ...... l O l The environmental distribution of associations belonging to the Himantia fauna- evidence from North Wales and Norway.By P. J. Brenchley and B. Cullen . ........ ..... 113 Ordavieian benthic macrofaunal associations.By V. Jaanusson . . . . . . . . . . . . . . . . . . . . . 1 27 Palaeoecology of Ordavieian Bryozoa.B y June R. P. Ross .... .... .. . . ... .. ....... 141 Middle-Upper Ordavieian shallow platform to deep basin transect, southem Tasmania, Australia. By C. Burrett, B. Stait, C. Sharples and J. Laurie .......... 149 Ordovician Graptolitic Environments Palaeoecology of graptolitic black shales.By S. H. Williams and R. B. Rickards .... .. .. .. 159 Biogeography of Ordavieian graptolites in the southem Appalachians.By S. C Finney ..... 167 Black shale geochemistry: a possible guide to Ordovician oceanic water masses. By W. B. N. Berry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 77 Ordavieian Volcanic Environments Ordovician volcanici ty. By C J. Stillman . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 83 Faunas in a volcaniclastic de bris flow from the Welsh Basin: a synthesis of palaeoecological and volcanological observations. By M. G. Lockley . . . . . . . . 1 95 Lower Ordovician volcanism in North West Argentina. By F. G. Acenolaza and A. Tasel/i . . . 2 03 lndexes. By D. L. Bruton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 11 Editorial The IV International Symposium on the Ordo and style of presentation will be of general in vician System was held in Norway in August terest to the specialist and non-specialist alike. 1982 and followed similar meetings in France I take this opportunity of thanking all (1971), Great Britain (1974) and the U.S.A. authors for agreeing to leeture and for meeting (1977). The Symposium was sponsored and the December '82 dead-line set for submission partly financed by the International Union of of manuscripts. These have since been assessed Geological Sciences (IUGS) and numerous oil by a number of referees, some of whom wish to conipanies, but it was left to the "Friends of remain anonymous. Nevertheless I wish to the Ordovician" to organise. This group has no thank Henry Williams, Alan W. Owen and David constitution, and membership is open to all A. T. Harper for their assistance. Hans Arne with interest in "things Ordovician". The Nakrem kindly re-drafted some of the original friends, via Reuben J. Ross Jr. and Stig M. Berg text-figures and Elisabeth Sundholm re-typed ström approached me in 1977, suggested the seetians of manuscript where necessary. date and venue of the fourth symposium, and All views expressed in the papers represent gave me a free hand in organising the program the opinion of the authors as of l June 1983, me and meetings. From the start I came to rely after which date no amendments or additions heavily on the support of Valdar Jaanusson and have been made to manuscripts. much later especially Henry Williams. Valdar The following sponsors are thanked for Jaanusson and I decided that part of the pra financial contributions which enabled this book grarorne should be devoted to the presentation to be published: of those aspects of the Ordavieian System such Norsk Hydro A/S as elimate, volcarrieity, global transgressions and Statoil regressions etc., often neglected yet so impor Total Marine Norsk A/S tant in their hearing on the more commonly Elf Aquitaine Norge A/S studied stratigraphy and faunas. The former Norsk Getty Exploration A/S aspects have been given scant attention, so Norske Esso A/S much so that some of the leeturers invited to British Petroleum present individual themes had to start prepar ation from scratch often using only a few pub David L. Bruton lished results. Paleontologisk Museum, This book contains twenty of the invited Sars gate l, thernatic leetures presented on two days of the Oslo 5. Symposium and it is hoped that their content Norway. Reference to this volume It is suggested that either of the following alternatives should be used for future biblio graphic reference: BRUTON, D. L. (ed.} 1984. Aspects of the Ordavieian System. Palaeontological Contributions from the University of Oslo, No. 295, Universtetsforlaget. JAANUSSON, V. 1984. What is so special about the Ordovician? pp. 1-3 In Bruton, D. L. (ed.). Aspects of the Ordavieian System. Palaeontological Contributions from the University of Oslo, No. 295, Universitetsforlaget.
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