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Hochmoos Formation, Lower Gosau Subgroup; Coniacian/Santonian; Upper Austria)

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Hochmoos Formation, Lower Gosau Subgroup; Coniacian/Santonian; Upper Austria) Contributions to the lithostratotype of "Hofergrabenmergel" (Hochmoos Formation, Lower Gosau Subgroup; Coniacian/Santonian; Upper Austria) Lenka Hradecká1, Harald Lobitzer2, Franz Ottner3, Felix Schlagintweit4, Marcela Svobodová5,István Szente* Lilian Švábenická1 & Irene Zorn6 1 Czech Geological Survey, Klárov 3, CZ-118 21 Praha 1, Czech Republic. [email protected]; [email protected] 2 Lindaustrasse 3, A-4820 Bad Ischl, Austria. [email protected] 3 Bilateral cooperation between Universität für Bodenkultur, Institut für Angewandte Geologie, Peter Jordan Strasse 70, A-1190 Wien, Austria. [email protected] Geologische Bundesanstalt Vienna 4 Lerchenauerstrasse 167, D-80935 München, Deutschland. [email protected] and 5 Institute of Geology, v.v.i., Academy of Sciences of the Czech Republic, Rozvojová 269 , CZ-165 00 Praha 6, Czech Republic. [email protected] Czech Geological Survey Prague 6 Geologische Bundesanstalt, Neulinggasse 38, A-1030 Wien, Austria. [email protected] *Museum of Natural History, Faculty of Science, Eötvös University, Pázmány P. sétány 1/c, H-1117 Budapest, Hungary. [email protected] L i m e s t o n e i n t e r c a l a t i o n s The “Hofergrabenmergel” on their classical According to the present knowledge this The ostracod fauna from the Hofergraben is locality in Sattelgraben (currently used In the upper part of the grey predominantly shallow-marine macrofossil-rich very poor. Main faunal elements are Bairdia fossil-bearing marl sequence Zw 1 topographic name for „Hofergraben“) and marly sequence in the Hofergraben is up to and Cytherella. The palynomorph assemblage SCH2 o f t h e H o f e r g r a b e n m e r g e l SCH6 Zw 2 SCH3 SCH1 outcrops in Finstergraben and Schattau in several tens of meters thick and comprises corresponds to Oculopollis-Complexiopollis several layers of limestones in SCH3A SCH7 K+S 7 K+S 11 FG 1,2 Gosau region, Northern Calcareous Alps, nannozones UC11 and UC12 correlated with the Dominance Zone (Coniacian-Santonian). the dm-range are intercalated. Upper Austria, represent the upper section of Upper Coniacian-Middle Santonian. Dinocyst assemblages suggest prevailingly Yellow coquinas, respectively the Hochmoos Formation, which is part of the Nannofossil assemblages consist of scarce shallow marine conditions (Dinogymnium, limestones rich in fossil debris, consisting of corals, pelecypods Lower Gosau Subgroup. Micula staurophora, and consistent Odontochitina, Xenascus), occasionally mixed HG2 HG1 and gastropods predominate, HG3 The Hofergabenmergel (name coined by Lucianorhabdus quadrifidus with long distal with chorate dinocysts of litoral or neritic also non-limestone clasts can Kollmann, in Plöchinger 1982) are represented stems. The foraminiferal assemblages are environment (Spiniferites, Florentinia). be observed in part frequently by soft grey marls in part rich in corals, dominated by benthonic taxa and confirm a Another type of the intercalations gastropods and bivalves. stratigraphical range from the Dicarinella consists of slightly bituminous concavata to Dicarinella asymetrica Zones. black marly limestones, which are also rich in fossils. Also fine-clastic/sandy limestone beds Finstergrabenwandl Finstergrabenr Hofergraben occur. In all these intercalations also microfossils, which indicate a l a g o o n a l s h a l l o w w a t e r palaeoenvironment can be observed . Schattau 3A Following the heavy rainfalls in early August We consider the Hofergrabenmergel basically 2002 a shallow ditch along the Zwieselalm forest as sediments of a shallow marine muddy water road temporarily exposed the topmost grey environment. In the upper part of the coral marls of Hochmoos Formation (sample point marls sequence light-yellowish limestone beds, K&S 11 A) below the Kalksandsteinbank of rich in corals, gastropods and bivalves are Finstergrabenwandl outcrop. The rich intercalated and also dark grey bituminous macrofauna of the Kalksandsteinbank of calcareous layers up to a few dm thickness Finstergrabenwandl was described by Dhondt occur. The occasional presence of non-marine (1987): bivalves), Kollmann (1980: gastropods), algae in part of the marls points to freshwater Summesberger (1979, 1980, 1992: ammonites) influence from river-estuaries. and Tröger & Summesberger (1994: PALYNOMORPHA inoceramids). Our sample K&S 11 A from the soft grey marls on the immediate basis of the Stratigraphically important and characteristic species Kalksandsteinbank yielded poorly preserved assemblages of foraminifers, calcareous Palynozone OCULLOPOLLIS-COMPLEXIOPOLLIS Coniacian – Early Santonian Dinoflagellate cysts nannofossils and palynomorphs, which show an Samples HG1 HG2A HG2B HG3A HG3B Coronifera oceanica, Cannosphaeropsis, Dinogymnium Dinoflagellate cysts Upper Santonian age. Achomosphaera ramulifera (Deflandre) Evitt * * ** ** denticulatum, D. microgranulosum, Florentinia buspina Cannosphaeropsis sp. * * (dominant at Hofergraben) Cleistosphaeridium sp. *** ** ** ** ** Coronifera oceanica Cookson & Eisenack * Dinogymnium denticulatum (Alberti) Evitt et al. * Dinogymnium cf. microgranulosum Clarke & Verdier * Terrestrial palynomorphs Dinogymnium sp. * Florentinia buspina (Davey &Verdier) Duxbury * Oculopolis, Complexiopolis, Krutzschipollis, Pseudoplicapolis, Florentinia sp. * Hystrichostrogylon membraniphorum Agelopoulos * * Schulzipollis, Interporopollenites Redeposition - Kiokansium polypes (Cookson & Eisenack) Below * Oligosphaeridium complex (White) Davey & Williams * * * Halimeda from bisaccate gymnosperm Palaeohystrichophora infusorioides Deflandre A ** ** ** ** lower content of including Spinidinium sp. ** ** ** pteridophyte spores Spiniferites ramosus (Ehrenberg) Loeblich & Loeblich A ** ** A Echinatisporis varispinosus the Hofergraben Acritarchs/prasinophytes Micrhystridium sp. * A ** C ** Leiosphaeridia cf. similis Cookson & Eisenack * * Veryhachium reductum Deunff C * Saccate gymnosperm pollen represent archaic-pine Veryhachium sp. * ** Non-marine algae types redeposited from older Permian and Triassic deposits Chomotriletes minor Pocock * Scolecodonts (jaws of worms Annelida-Polychaeta) * * Chitinous linings of foraminifers AA *** *** AA ** Schattau, FG, K&S localities Pteridophyte spores Appendicisporites sp. * Cicatricosisporites sp. * * Oculopolis sp. Converrucosisporites sp. * Costatoperforosporites sp. * Cyathidites sp. * * Echinatisporis varispinosus (Pocock) Srivastava *** * ** * Plicatella sp. * Gymnosperm pollen Alisporites bilateralis Rouse * Corollina/Classopollis torosus (Reissinger) Couper ** ** ** ** ** 1 2 3 4 Cycadopites fragilis Singh * Ephedripites sp. * Inaperturopollenites undulatus Weyland & Greifeld * bisaccate gymnosperm (Triassic redeposition) R ** R* R* R* R* The calcareous interlayers with bisaccate gymnosperm (Permian redeposition) R* Angiosperm pollen corals, Scabrotrigonia and Complexiopollis cf. funiculus Tschudy ** ** 5 Oculopolis sp. Complexiopollis vulgaris (Groot & Groot) Groot& Krutzsch ** ** 6 Complexiopollis div. sp. ** * ** ** 1 Micrhystridium cf. stellatum DEFLANDRE 1945, FG2, slide 1270/1, 19 Halimeda paucimedullaris Interporopollenites sp. * Krutzschipollis cf. crassus Góczán * * 2 Odontochitina operculata ( O. WETZEL 1933) DEFLANDRE & COOKSON 1955, Oculopollis orbicularis Góczán *** ** ** ** * probably represent tempestites. Oculopollis cf. zaklinskaiae Góczán * * Schattau 3, 1273/1, 150 Oculopollis div. sp. C ** ** A ** 3 Pseudoculopollis sp., FG2, 1270/1, 28 Pseudoplicapollis cf. peneserta Pflug * Retitricolpites sp. * 4 Oculopollis subtilis GÓCZÁN, FG2, 1270/2, 29 Schulzipollis sp. * Trudopollis sp. * 5 cf. Bohemiapollis sp., Schattau 3, 1273/1, 34 6 Pseudopapillopollis sp., K & S 11A, 1274/1, 43 FORAMINIFERA Stratigraphically important and characteristic foraminifera HOFERGRABEN General character of foraminiferal assemblage Late Coniacian-Early Santonian Early Santonian planktonic zones Dicar. concavata ? Dicar. asymetrica samples HG 1 HG HG HG HG 2A 2B 3A 3B Foraminifera are poorly preserved, calcareous tests are recrystalized Tritaxia tricarinata x x x Triplasia murchisoni x x The organic part of washed material is formed by foraminiferal tests, Tritaxia trilatera x relicts of spines and pelecypods, small gastropods and tests of ostracods. Gaudryina trochus xx x Hofergraben Gaudryina sp. x Planktonic species were found only in samples from Hofergraben locality Gaudryina pyramidata x Calcareous benthos ( Quinqueloculina, Nummofallotia, Gavelinella) were Late Coniacian Gaudryina cretacea x â Gyroidinoides nitida x frequent in Finstergraben, Schattau and K&S localities. â â Gyroidinoides globosus x Neoflabellina suturalis praecursor (Wedekind), Frondicularia becksi (Reuss) Dorothia conula x and Pyramidina kelleri (Vasilenko) together with planktonic Marginotruncana Dorothia pupa x Marssonella oxycona x Finstergraben, Schattau, K&S localities angusticarinata (Gandolfi). Bolivinopsis praelonga x x â Spiroplectammina sp. x In the foraminiferal assemblage free plugs of Vaginulina trilobata xx x â Nummofallotia cretacea (Schlumberg) together with Quinqueloculina sp., Epistomina scalaris Vaginulina gosae xx x Lenticulina pseudocultrata ? ? Franke and Gavelinella schloenbachi (Reuss) are frequent. Lenticulina marcki x Gavelinella pseudoexcolata x ? xx Gavelinella lorneiana x Gavelinella stelligera ? x ? Santonian Early Santonian Quadrimorphina allomorphinoides x â â Quinqueloculina angusta x x x FINSTERGRABEN Sigalia The assemblage with frequent Gavelinella pseudoexcolata (Kalinin) and deflaensis Ramulina laevis x age
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