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Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » J/K boundary in Austria 2009: papers by Lukeneder & al (from Ann. Naturhist. Mus. Wien.)
J/K boundary in Austria 2009: papers by Lukeneder & al
mhornДата: Sunday, 22.02.2009, 13:54 | Сообщение # 1
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1) Lukeneder A. (2009) New biostratigraphic ammonite data from the Jurassic/Cretaceous boundary at Nutzhof (Gresten Klippenbelt, Lower Austria) // Annalen des Naturhistorischen Museum Wien, 110 A, 313-329, Wien.

Pdf: http://www.nhm-wien.ac.at/Content....n09.pdf

Upper Jurassic to Lower Cretaceous ammonites were collected at the Nutzhof locality in the eastern part of the Gresten Klippenbelt in Lower Austria. The cephalopod fauna from the Blassenstein Formation, correlated with micro- and nannofossil data from the marly unit and the limestone unit, indicates Early Tithonian to Middle Berriasian age (Hybonoticeras hybonotum Zone up to the Subthurmannia occitanica Zone). According to the correlation of the fossil and magnetostratigraphic data, the entire succession of the Nutzhof section embraces a duration of approx. 7 million years (approx. 150–143 Ma). The deposition of the limestones, marly limestones and marls in this interval occurred during depositionally (e.g. tectonics) unstable conditions. The ammonite fauna comprises 6 different genera, each apparently represented by a single species. The occurrence at the Nutzhof section is dominated by ammonites of the perisphinctid-type. Ammonitina are the most frequent component (60 %; Subplanites and Haploceras), followed by the Phylloceratina (25 %; Ptychophylloceras and Phylloceras), and the Lytoceratina (15 %; represented by Lytoceras and Leptotetragonites). The ammonite fauna consists solely of Mediterranean elements. New species Subplanites fasciculatiformis is described

2) Pruner P, Schnabl P., Lukeneder A. (2009) Preliminary results of magnetostratigraphic investigations across the Jurassic/Cretaceous boundary strata at Nutzhof, Austria // Annalen des Naturhistorischen Museums Wien, 110 A, 331-344, Wien.

pdf: http://www.nhm-wien.ac.at/Content....ner.pdf

The principal aim of detailed magnetostratigraphic and micropalaeontological investigation on the Jurassic/Cretaceous (J/K) boundary is precisely determine the boundaries of magnetozones and narrow reverse subzones, and find global correlation across the J/K boundary. A high resolution study focusing on the detailed biostratigraphy of the limestone-, marly limestone- and marl succession at Nutzhof has been carried out at a new outcrop in the Gresten Klippenbelt of Lower Austria. Eleven magnetic polarity zones, six reverse ( r ) and five normal (N) polarity – are included in the whole interval (18 m) around J/K boundary of Nutzhof section. The J/K boundary (the Berriasian Stage base), located near Calpionella Zone base (Reháková et al. 2008; Reháková et al. this volume) roughly corresponds to magnetozone M19N a succession of M-zones correlative with M17N to M22R. Low-field magnetic susceptibility (k) ranges from -5.9 to 94.9×10-6 SI and the intensity of the natural remanent magnetization (NRM) varies between 31 and 615×10-6 A/m. The samples display a two- to three-component remanence. The average sampling density for the whole section was around two samples per 1 m of true thickness of limestone strata in these preliminary results. The next step of investigation will be to precisely determine the boundaries of magnetozones M19 and M20 including narrow reverse subzones with the high resolution sampling density for the whole section.

3) Rehakova D., Halasova E., Lukeneder A. (2009) The Jurassic-Cretaceous boundary in the Gresten Klippenbelt (Nutzhof, Lower Austria): Implications for Micro- and macrofossil analysis // Annalen des Naturhistorischen Museums Wien, 110 A, 345-381, Wien.

pdf: http://www.nhm-wien.ac.at/Content....ova.pdf

The paper discusses the results of an integrated study of three microplankton groups (calpionellids, calcareous dinoflagellates and nannofossils) and macrofauna (ammonites, belemnites and aptychi) in the Nutzhof section. The stratigraphic investigation of the microfauna revealed that Nutzhof comprises a sedimentary sequence of Early Tithonian to Middle Berriasian age. Based on the distribution of the stratigraphically important planktonic organisms, several coeval calpionellid, dinocyst and nannofossil bioevents were recorded
along the Jurassic-Cretaceous boundary beds.

4) Kroh A., Lukeneder A. (2009) Crinoids from the Late Jurassic of the Nutzhof section (Lower Austria, Gresten Klippenbelt) // Annalen des Naturhistorischen Museums Wien, 110 A, 383-399, Wien.

pdf: http://www.nhm-wien.ac.at/Content....ids.pdf

Tithonian to Berriasian sediments of the Blassenstein Formation exposed at the Nutzhof section, 5 km north of Hainfeld, in the Gresten Klippen Belt were sampled for crinoids. Only the Tithonian part of the section proved suitable for bulk sampling. Four crinoid taxa (Balanocrinus sp., Saccocoma tenella (Goldfuss, 1831), Crassicoma ? sp., and Phyllocrinus belbekensis Arendt, 1974) could be documented. Among these, only S. tenella and probably Crassicoma ? sp. appear to be autochthonous; the others are interpreted as transported based on preservation and size range. The observed changes in lithology and microfauna may reflect geodynamically induced palaeogeographic changes and/or basinal deepening.


Middle Jurassic - Lower Cretaceous ammonites & aptychi
 
Jurassic Forum » JURASSIC references & paper reviews » Jurassic around the world » J/K boundary in Austria 2009: papers by Lukeneder & al (from Ann. Naturhist. Mus. Wien.)
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