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ISJS Newsletter 34 (1), 2007 International Subcommission on Jurassic Stratigraphy Newsletter 34 (1) Edited by Paul Bown, Nicol Morton, Jackie Lees July, 2007 Contents 1 Chairman’s report Nicol Morton New and updated proposals: 2 A candidate GSSP for the base of the Jurassic in the Northern Calcareous Alps (Kuhjoch section, Karwendel Mountains, Tyrol, Austria) A. von Hillebrandt, L. Krystyn, W.M. Kuerschner, with contributions from P.R. Bown, C. McRoberts, M. Ruhl, M. Simms, A. Tomasovych, M. Urlichs 21 The Triassic-Jurassic transition at Kunga Island, Queen Charlotte Islands, British Columbia, Canada L.M. Longridge, E.S. Carter, J.W. Haggart, P.L. Smith 34 Updated proposal for Global Stratotype Section and Point for the base of the Jurassic System in the New York Canyon area, Nevada, USA S.G. Lucas, D.G. Taylor, J. Guex, L.H. Tanner, K. Krainer 43 A proposal for the base Hettangian Stage (= base Jurassic System) GSSP at New York Canyon (Nevada, USA) using carbon isotopes C.A. McRoberts, P.D. Ward, S. Hesselbo 50 Waterloo Bay, Larne, Northern Ireland: a candidate Global Stratotype Section and Point for the base of the Hettangian Stage and Jurassic System M.J. Simms, A.J. Jeram 69 Triassic-Jurassic Working Group Members - revised ISJS Newsletter 34 (1), 2007, p.1 1 Chairman’s report Nicol Morton Le Chardon, Quartier Brugière, 07200 Vogüé, France; [email protected] This issue of the ISJS Newsletter is devoted entirely to the arrange for the (electronic) publication of an ISJS Triassic/Jurassic (T/J) boundary and the definition of the Newsletter as soon as possible in the Spring of 2007. This base of the Jurassic, and of the Hettangian Stage, at a would contain the up-to-date documentation of the new Global Stratotype Section and Point (GSSP). There will section in Austria. Inclusion of a proposal, as complete as be a further issue of the Newsletter later in the year that possible in the limited time available, for the Northern will deal with the ‘normal’ range of topics. Ireland section was arranged later, though it was clear that The Jurassic Subcommission established a Working the research was at a much earlier stage. Finally, it was Group on the T/J boundary in 1988, led by René suggested that authors of the three remaining ‘old’ candi- Mouterde (until 2000), then by Geoff Warrington. Efforts date sections should have the opportunity to present to find a suitable section have continued since then, but updated proposals. The updated proposal for St. Audries’ without success in identifying one of the four main sec- Bay is not yet available, but will be distributed as soon as tions studied (in SW England, USA, Canada and Peru) to possible. be proposed as meeting the requirements identified by the In the meantime, it was no longer clear who were the International Commission on Stratigraphy (ICS). During members of the T/J Boundary Working Group who would the period 2001-2005, the activities of International have the responsibility of selection, presumably by vot- Geological Correlation Program Project 458, ing, of the preferred candidate section to be proposed to ‘Triassic/Jurassic Boundary Events’, led by Joszef Palfy, the Subcommission. The published list was some years Stephen Hesselbo and Chris McRoberts, resulted in a old and in the meantime many new individuals had great amount of new data and information on this poorly become involved in relevant research. Clearly, they also understood interval. Although definition of the boundary should have the right to be involved. Finally, there was no was not an objective of the project, new research was obviously favoured candidate section that demonstrably stimulated that has resulted, during the last two years or fulfilled all the requirements of the ICS Guidelines, so so, in the present situation of several options being avail- that the selection would have to be of the ‘least bad’ alter- able to the T/J Boundary Working (or Task) Group and the native (by no means an unusual situation for GSSP pro- Subcommission. posals to the ICS!). Inevitably, the result would be some- Although ammonites have traditionally been regarded what controversial. Therefore, the membership list of vot- as the primary means of correlation, and so for definition ing members of the Working Group has been expanded to of chronostratigraphic boundaries, in the Jurassic, the new make it as widely representative as possible of a broad research has identified two possible alternatives – radio- spectrum of interests and ensure that the result will be larians and a distinctive, negative C-isotope excursion. more generally acceptable. Even more surprising was the discovery of two new can- This issue of the ISJS Newsletter is being distributed didate sections, in Austria (in 2005) and in Northern in the usual way by e-mail to all Voting, Corresponding Ireland (2006). During the 7th International Congress on and Honorary Members of the Jurassic Subcommission, the Jurassic System in Krakow, Poland (September, who are requested, as usual, to forward it to other col- 2006), new data and proposals were presented and dis- leagues. It will also be distributed to all the members of cussed. Only preliminary details of the two new sections the T/J Boundary Working Group. could be given, but it was agreed that fully detailed pro- Please study very carefully the proposals contained in posals should be submitted by about the end of 2006. this Newsletter and, if you are a member of the Working During the Working Group discussions, the candidature Group or, at a later stage, a Voting Member of the of the Peru section was withdrawn. Subcommission, exercise your objective professional The idea for this newsletter of the Jurassic judgement. The result will be with us for many years! Subcommission was hatched in Poland on 15th September, 2006, during the post-congress Fieldtrip B1. After a visit to an old quarry with an overhanging face that threatened to create some vacancies in the ‘Jurassic research establishment’, Axel von Hillebrandt discussed with me how a fully documented proposal for the new candidate section in Austria could be published quickly enough for it to be assessed, together with the other sec- tions, by the members of the T/J Working Group in the Spring of 2007. The best solution we could find was to 2 ISJS Newsletter 34 (1), 2007, pp.2-20 A candidate GSSP for the base of the Jurassic in the Northern Calcareous Alps (Kuhjoch section, Karwendel Mountains, Tyrol, Austria) A. von Hillebrandt, L. Krystyn, W.M. Kuerschner with contributions from P.R. Bown, C. McRoberts, M. Ruhl, M. Simms, A. Tomasovych, M. Urlichs Abstract The Kuhjoch section near Hinterriss (Tyrol, Austria) is proposed as Global Stratigraphic Section and Point (GSSP) candidate for the base of the Hettangian Stage and, as such, the base of the Jurassic System. The exact level is 5.80m above the top of the Koessen Formation and corresponds to the first stratigraphical occurrence (FO) of the ammonite Psiloceras cf. spelae Guex. This taxon relates to the group of Psiloceras tilmanni that is consider- ably older than the earliest NW European psiloceratids (i.e. Psiloceras erugatum, Psiloceras planorbis) and enables intercontinental Tethys-Panthalassa correlation of the boundary. The ammonite event correlates to the FO of Cerebropollenites thiergartii, a widely distributed palynomorph and Early Jurassic marker in continental succes- sions. Additional boundary events are the FO of the aragonitic foraminifer Praegubkinella turgescens and of the ostracod Cytherelloidea buisensis 60cm below the proposed stratotype point, and the disappearance of the ostracod δ13 Eucytherura sagitta immediately above the point. The Corg record shows an initial negative excursion near the boundary, between the Koessen and Kendlbach Formations. The Triassic/Jurassic bioevent lies above this peak. The δ13 proposed stratotype point coincides with a shift to more positive Corg. The well-exposed section displays a high and continuous sedimentation rate - the highest of all proposed GSSP candidates - with a constant facies trend across the boundary level. It contains well preserved and frequent fossils and meets all requirements necessary for a GSSP selection. 1. Introduction yield Triassic micro- and nannofossils, and that the earlier Sedimentary successions across the Triassic/Jurassic (T/J) cessation of the Triassic macrofauna may be an effect of boundary, which are expanded and highly fossiliferous in deteriorating environmental conditions (Kuerschner et al., the Northern Calcareous Alps, are restricted to the so- 2007). called Eiberg Basin, a Rhaetian intraplatform depression Within the Eiberg Basin, between Lake St. Wolfgang that can be traced over 200km from the Salzkammergut (Kendlbach) and Garmisch-Partenkirchen (Figure 1), all (Kendlbachgraben, Upper Austria) in the east to the sections show the same sedimentary record across the T/J Lahnewiesgraben Valley (NW of Garmisch- boundary, with varying carbonate vs. clay content, Partenkirchen, Bavaria) in the west (Figure 1). Flanked by depending on their more marginal or more distal position carbonate platforms to the north and south, this within the basin. The boundary between the Koessen and continuously subsiding basin reached 150-200m water- Kendlbach Formations is lithologically similar all over depth in late Rhaetian time and was, therefore, less the basin; it is distinct and easy to recognise, and therefore affected by the end-Triassic sea-level drop, which led to interpreted as isochronous in all sections. A general
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