LITOSTRATIGRAPHY OT THE LAWERMOST KIMMERIDGIAN FROM THE AREA OF SULEJOW UPON PILICA
Summary
The Upper Jurassic deposits recently assigned to the Upper Oxfordian and Lower Kimmeridgian (the Idoceras planula - Katroliceras divisum ammonite zones) occur in the area of Sulejow upon Pilica river, NW Mesozoic margins of the Holy Cross Mts. The deposits area here divided into 4 lithological complexes. The section of the second complex comprising the Sutneria platynota and possibly the basal part of the Ataxioceras hypselocyclum zone is discussed in detail. This complex primarily comprises sparry microonkolitic, lumpy and micritic limestones. The limestones yield numerous solenoporids, corals, pelecypods and gastropods. Deposits of that complex correspond to the Recent deposits of the lumpy, lumpy-silty and partly silty facies from the Great Bahama Bank.
JURASSIE AND CRETACEOUS LITHOSTRATIGRAPHIC UNITS OF THE TATRA MTS; A CRITICAL COMMENT
Summary
The differentiation of Jurassic and Cretaceous lithostratigraphic units in the Tatra Mts may be treated as an example of introduction of principles of Polish stratigraphic classification. This formanzation is here critically analysed with reference to principles of differentiation of lithostratigraphic units in the Alpides. The use of the Pieniny names in the Tatra Mts, especially in the case of units differing in development (as e.g. Pieniny Limestone Formation or Krupianka Limestone Formation) is treated with reservation. The differentiation of the Dunajec Group in the Tatra Mts appears unfounded. Similar is the case of assigning various lithological sequences - spongiolites and crinoid and red limestones - in a single Buciska Limestone Formation as the sequences may be better treated as separate formations. Reservation is also made with reference to justification of formalization of the Choc Jurassic sequence in the Tatra Mts as the Mietusia Limestone Formation with several members. Better profiles of both the Choc Jurassic and Krizna Lower Cretaceous (differentiated as the Kościeliska Marl Formation) are known in Slovakia and stratotypes for these units should be selected in the latter area . Moreover, the subdivision of the Raptawicka Turnia Limestone Formation should be supplemented by differentiation of members.
It is stated that principles of formalization should be established in cooperation with geologists from the neighboring countries, especially Slovakia, in order to avoid multiplication of names by naming parts of units separated by state boundary. The formalization should be aimed at obtaining more precise definition of mappable lithostratigraphic units and not giving new names for not always sufficiently known sequences.
A new gastropod species from chalky limestones of the Upper Jurassic of Sulejow is described. Its internal structure has been studied on the basis of axial sections. Its ontogeny and taxonomic position is discussed.
st 1997 Summary The Tithonian nerineaceans Eunerinea hoheneggeri (PETERS), Cryptoplocus cf. picteti GEMMELLARO, Ptygmatis pseudobruntrutana (GEMMELLARO), Ptygmatis carpathica (ZEUSCHNER), Endoplocus staszycii (ZEUSCHNER), Itieria globosa FAVRE, and Aphanotaenia strigillata (CREDNER) are described from the Ernstbrunn Limestone of the Dorfles quarry (Waschberg Zone, Lower Austria). These species form a significant component of the diceras-coral- nerineacean assemblage typical for the shallow-water carbonate platform of the northern Tethys during Tithonian time. Zusammenfassung Die Nerineacea Eunerinea hoheneggeri (PETERS), Cryptoplocus cf. picteti GEMMELARO, Ptygmatis pseudobruntrutana (GEMMELARO), Ptygmatis carpathica (ZEUSCHNER), Endoplocus staszycii (ZEUSCHNER), Itieria globosa FAVRE, and Aphanotaenia strigillata (CREDNER) werden aus dem tithonen Ernstbrunner Kalk des Steinbruches von Dorfles, (Waschbergzone, Niederosterreich) beschrieben. Die Arten sind wichtige Bestandteile der Diceras-Korallen-Nerineen-Assemblages, die fur die tithone Flachwasser-Plattform des Nordrandes der Tethys charakteristisch sind. The present paper provides results of a study of the nerineacean gastropods from the Tithonian deposits cropping out in the environs of Dorfles near Ernstbrunn, Lower Austria. Most of these fossils, which are housed in the Naturhistorisches Museum in Vienna, were collected by the late Dr. Friedrich BACHMAYER. Additional specimens were collected during an excursion with Dr. H. A. KOLLMANN and Mag. T. HOFFMANN. The occurrence of nerineaceans in the Ernstbrunn area has been mentioned for about one hundred years (see GRILL 1968), but up to now these fossils have not been described. The investigated nerineacean collection from Dorfles comprises nearly a dozen species, but only the best preserved taxa are described. The description of the nerineacean assemblage from the Ernstbrunn Limestone is a contribution to our knowledge of nerineacean distribution along the northern margin of the Tethys at the end of the Jurassic period.
Maiolica - charakterystyczna facja Zachodniej Tetydy
Light-coloured pelagic limestones with chcrts, known as maioliea, arc a distinctive uppermost Jurassic -Lower Cretaceous facies of the Western Tethys. This facies originated in both, oceanic bottoms and in continental margins, mainly in deep basins but also on drawned platforms and on submarine elevations. It rcflccts the greatest facies unification in the Mesozoic history of the Western Tethys. The development of maioliea in the Western Tethys may be related to: (i) the restriction of deep-water connections with the Eastern Tethys, (ii) the establishment of anticstuarine circulation, (iii) subcvaporilic conditions, (iv) the development of calcareous nannoplankton, (v) the lowering of CCD in response to factors (i)-(iv).
Pelagiczne wapienie z krzemieniami zwane maiolica są charakteystyczną facją pelagiczną przelomu jury i kredy Zachodniej Tetydy. Facja ta wystepowala zarowno na dnach oceanicznych, jak i na brzegach kontynentow, glownie w glebokich basenach, ale rowniez na pogrązonych platformach czy wyniesieniach podmorskich. Jest wyrazem najwiekszego ujednolicenia facjalnego w mezozoicznej historii Zachodniej Tetydy.
