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Uppermost Triassic Conodonts from the Kössen Formation of the Northern Calcareous Alps (Austria) 665-676 ©Geol

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Uppermost Triassic Conodonts from the Kössen Formation of the Northern Calcareous Alps (Austria) 665-676 ©Geol ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Jahrbuch der Geologischen Bundesanstalt Jahr/Year: 1989 Band/Volume: 132 Autor(en)/Author(s): Kachroo R.K. Artikel/Article: Uppermost Triassic Conodonts from the Kössen Formation of the Northern Calcareous Alps (Austria) 665-676 ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at Jb. Geol. B.-A. ISSN 0016-7800 Band 132 Heft 4 S.665-676 Wien, Dezember 1989 Uppermost Triassic Conodonts from the Kössen Formation of the Northern Calcareous Alps (Austria) By R. K. KACHROO*) With 2 Figures and 2 Plates Austria Northern Calcareous Alps Triassic Kössen Formation Stratigraphy Osterreichische Kartei: 50.000 Misikella faunas Blätter 66, 69, 72, 88, 90-92, 94, 95, 100, 118, 119, 142 Microlacies Contents Zusammenfassung 665 Abstract 665 1. Introduction 666 2. Materials and Methods 666 3. Previous Work on Conodonts 666 4. Stratigraphical and Lithological Outline of the Localities of Conodont-Bearing Beds 667 4.1. Vorarlberg 667 4.2. Tyrol 667 4.3. Salzburg 668 4.4. Upper Austria (Oberösterreich) 669 4.5. Styria 669 4.6. Lower Austria (Niederösterreich) 669 5. Facies Interpretation of the Conodont-Bearing Rocks 669 6. Systematic Descriptions 670 Acknowledments 672 References 676 Zusammenfassung nicht ändert. Dieser posthernsteini-Bereich ist mit der eingeeng- ten posthernsteini assemblage-Zone sensu KOZUR& MOCK (1974) Von den 20 detaillierten Profilen in den Kössener Schichten zu vergleichen. (Obertrias) der Nördlichen Kalkalpen werden 34 neue Co- Zu Beginn des obersten Drittels der Kössener Schichten nodonten führende Niveaus beschrieben. Die Fauna be- (Kössener Fazies), unmittelbar über dem Lithodendronkalk- schränkt sich auf Misikella hernsteini, M. posthernsteini, M. rhaetica niveau, einem bedeutenden lithostratigraphischen Marker, fällt und M. koessenensis, vereinzelt vergesellschaftet mit Astformco- das Erstauftreten von mit dem der Gattung nodonten. Misikella rhaetica, Choristoceras zusammen. Dieses Ereignis bietet sich, neben Auf Grund der verschiedenen Faunenzusammensetzung dem starken lithofaziellen und faunistischen Schnitt, als An- können vier stratigraphisch übereinander folgende Bereiche haltspunkt für eine Nor-Rhät-Grenzziehung an. Weiters wur- unterteilt werden, die sich in alle Profilen biostratigraphisch den die conodontenführenden Gesteine mit Hilfe der Stan- wie Iithostratigraphisch korrelieren lassen: hernsteini-Bereich, dard-Mikrofaziestypen charakterisiert und mit dem Fazies- hernsteini / posthernsteini-Bereich, rhaetica-Bereich und posthernsteini- Bereich (siehe Abb. 2). schema von WILSON (1975) verglichen. Hinzu kommt eine sy- stematische Beschreibung und Auflistung der Fundpunkte der Zum ersten Mal wurden an der Basis der schwäbischen Fa- Gattung Misikella. zies Misikella hernsteini gefunden - hernsteini-Bereich - ein weite- rer Hinweis auf das obernorischen Alter der Basis der Kösse- ner Schichten. Misikella hernsteini reicht zusammen mit Misikella posthernsteini - hernsteini/posthernsteini-Bereich - bis an die Basis Abstract der Kössener Fazies, wo Misikella rhaetica zum ersten Mal auf- tritt. Die untere Hälfte der Kössener Fazies wird durch die Based on the study of 20 sections the conodont fauna of Vergesellschaftung von Misikella posthernsteini, M. rhaetica und M. the Alpine Koessen Formation, Austria, is described. It is a koessenensis charakterisiert - rhaetica-Bereich - und entspricht fauna composed exclusively of one genus, Misikella, and asso- der rhaetica Zone nach MOSTLER(1978). ciated with rare ramiform elements (Hindeodella, Enantiognathus, In der oberen Hälfte konnte nur Misikella posthernsteini gefun- Cypridodella, Priniodina, Chirodella, Cornudina, Hibardella). Misikella is den werden, obwohl sich die Fazies für Conodonten generell represented by Misikella hernsteini, Misikella posthernsteini, Misikella rhaetica and Misikella koessenensis. Based on their different verti- cal distribution, four stratigraphically distinct assemblages *) Author's address: Dr. R. K. KACHROO,Department of Geolo- can be established. These are, from the base to the top the gy, Faculty of Science, University of Maiduguri, P.M.B. hernsteini, the hernsteini/posthernsteini-, the rhaetica- and the post- 1069 Maiduguri, Nigeria. hernsteini- assemblages. The long standing discussion about 665 ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at the lower age of the Koessen Formation can be resolved by 2. Material and Methods the finding of Misikella hems/eini "in four sections. Thus the base of the Koessen Formation can be tentatively taken as Upper Detailed stratigraphical investigations and sampling Norian. The four assemblages give a detailed biostratigraphic correlation of the described sections and suggest the Litho- of 26 outcrops (Text-Fig. 1) were carried out from the dendronkalk as a lithostratigraphic marker bed. The first oc- summer 1983 to 1986 as part of the research for the currence of Misikella rhaetica in the upper third of the sequence Ph. D. thesis of R. GOLEBIOWSKIabout the Koessen corresponds to the appearance of the ammonoid genus Chori- Formation. The samples, weighing 3 to 10 kilograms, s/oceras and which may be used as a marker for establishing were collected bed by bed at different stratigraphical the Norian-Rhaetian boundary. levels for conodont separation. Following maceration in acetic acid, the residues were separated by the Tetra- bromäthan method resulting in the yield of conodont 1. Introduction specimens. The conodont fauna was recovered from 35 samples from 20 localities (Text-Fig. 2). The most promising quantity of rock samples for conodont-ma- ceration amounts to about 7 to 8 kilograms each. All the specimens are deposited in the microfossil collec- tion of the Institute of Palaeontology, University of Vienna, Vienna/Austria. 3. Previous Work on Conodonts Conodonts from the Koessen Formation were investi- gated for the first time by MOSHER(1968). He examined the well known locality of Kendlbach, previously Fig.1. Localitiesof upperTriassicconodontfinds in the NorthernCalcareousAlps (Austria). Mountains (SIKIC et ai., 1975) in Yugoslavia, in the studied by SUESS & MOJSISOVICS(1868), and described Bakony Mountains (VEGH, 1964) in Hungary and in a these conodont specimens as Neospathodus lanceolatus. few parts of Rumania. The work was continued by KOZUR (1971) and KOZUR The stratigraphical position of the Koessen Forma- & MOSTLER (1973). KOZUR & MOCK (1974) gave a de- tion lies between the Upper Norian Hauptdolomit, over- scription of the genus Misikella and established the Misi- lain by Plattenkalk (CZURDA& NICKLAS, 1970) and vari- kella posthernsteini assemblage zone corresponding to the ous Liassic sediments such as the Adneter Kalk, Hier- Choristoceras marshi-zone. MOSTLERet al. (1978) published latzkalk or Fleckenmergel. According to the ammonite the conodont fauna from the Weißloferbach section, zonation of TOZER (1967) the Koessen Formation is describing Misikella rhaetica and Misikella koessenensis. In placed between the Rhabdoceras suessi and the Choris- this work he subdivided the posthernsteini assemblage- toceras marshi zone. zone by keeping the rhaetica-zone in the lower part. EXARCHOS(1977) studied the Gaissau section in de- *j The informal term "Upper RhaetianLimestone" has been replaced tail and supported the proposed zonation of MOSTLER by the correct name Steinplattekalk (SCHLAGER& SCHÖLLNBERGER,(1978). GAZDZICKI (1978) and GAZDZICKI et al. (1979) 1975). have also reported Misikella faunas from the West Car- 666 ©Geol. Bundesanstalt, Wien; download unter www.geologie.ac.at 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 BEREICH 0 0 0 0 0 ~. 'if~-:,,~,~'< :; Gl 3) '"Gl \ß~n ~{f1~ 1) N r~Df( :~t1i~~Ii f"_V';'\f,i~ --= u.'" . ... ~ oo~ &00.6 I ......... Gl 00 od'! c: 00 00 oo~ oo~ 00 ~ .2'" .. Gl I.) Qj 00 0 :-:.:.:.:.:.:.:.: '" ..11 ...11 Z :0 ~ '" -E '" 0 '" w ~ :","'" oO~ ' "',i,'i~ 00 0 o~ I- 0 il,::~;~/-;~,.0 Ol:l .l~0 •~ 0 .00 ~ :I: If! U .... '"Gl N :I:- .............. u. '" .l- U III c: .............. .<:: 'Qi en 0 0; .............. rJl rn :<: 1) E er: Gl .............. OJ .<:: W e- o; z .............. 8. w ........ ~'" j., I '2 en 'Qi en ....... rJl 0 0; Gl 4. c: ~ .0 :0 N Gi ~ ............... 4) .<:: ............... U.'" .0 • 0 - III .<:: '" I 0 rJl '2 'Qj .0 :'" a; ~ • E .<:: III 0 .<:: Cf) • .... • • • Misikella hernsteini o M. rhaetiea ~ Lithodendronkalk .. Asttormeonodonten o M. posthernsteini t. M. koessenen si s t>.'.,.;J Oberrhätkalk Fig.2. Generalized stratigraphic section of Koessen Beds showing range of Misikella. patians. KRYSTYN(1980) described additional conodont Vomp in the Inn Valley. The samples were collected faunas from the Kendlbach and Gaissau section and from the Swabian Facies, exposed on a forest road. found conodonts in the sections of Steinplatte and The conodont specimens are somewhat metamor- Hochalm (personal communication). phosed. e Hinter-Riss ÖK118 472730/1129 4. Stratigraphical and Lithological Outline The outcrop is situated north of the Karwen- of the Localities delgebirge on the right side of Hinter-Riss. The sed- of Conodont Bearing Beds iments of the upper half of the Koessen Formation (Text-Fig. 1) are distinct, rich in marls and well exposed along the forest road of the Schloßgraben. The sample 4.1. Vorarlberg point belongs to the Lower Koessen Facies and is situated 3 meters above the top of the Lithoden- o Formarin-See dronkalk. ÖK 142*) 4710/1000 This locality,
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