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Violante, C., V. Ferreri., B. D'Argenio, S. Golubic 1994: Quaternary Travertines at Rocchetta a Volturno (Isernia, Central Italy). Facies Analysis and Sedimentary Model of an Organogenic Carbonate System. Ischia 1994. IAS 15th Regional Meeting. Pre meeting

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Authors: János Haas, Kinga Hips, Pál Pelikán, Norbert Zajzon, Annette E. Götz and Edit Tardi-Filácz

The Permian/Triassic boundary was recognized in continuous marine successions in several outcrops in the Bükk Mts, North Hungary and in a few core sections in the northeastern part of the Transdanubian Range. In the Bükk Mts, of four studied boundary sections only two proved to be complete. They represent an outer ramp setting. In these sections the topmost Permian is made up of dark gray limestone, rich in fragments of crinoids, calcareous algae, mollusks, brachiopods, ostracods, and foraminifera. There is a dramatic decrease in the amount of the bioclasts in the last two limestone layers, which are overlain by a 1 m-thick shale bed. The lower two-thirds of this bed still contain Permian fauna but its upper part is almost free of bioclasts. The overlying platy limestone contains a pauperized fossil assemblage indicating stress conditions. The two core sections studied in the Transdanubian Range represent an inner ramp setting. The uppermost Permian is made up of lagoonal-sabkha cycles. It is overlain by subtidal packstone-grainstone, rich in Late Permian fossils. Oolitic facies characterizes the boundary interval. Onset of ooid formation was probably the consequence of biotic decline leading to cessation of skeletal carbonate production. Along with oolite beds, stromatolites, micrite with "microspheres" and fine siliciclastic microlayers characterize the basal Triassic succession, reflecting overall stress conditions and the changing energy of the depositional environment.

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Abstract

In the Pilis Range, NW of Budapest, contemporaneous Upper Triassic platform and basin facies occur. The paper presents the extent and basic characteristics of these facies with interpretation of their depositional conditions, and summarizes the available biostratigraphic data. Based on previous and recent studies a general depositional model is displayed and the history of the basin evolution is outlined. Within the Dachstein Platform an extensional intraplatform basin (Feketehegy Basin) came into existence during the middle part of the Norian. An asymmetric basin was formed, bounded by steep and gentle slopes, respectively. The platform progradation that may have resulted in the termination of the basin began at the gentle margin probably in the latest Norian-earliest Rhaetian.

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The Middle Triassic Wetterstein Limestone was investigated on the Feuerkogel, in the eastern Höllengebirge area, Austria. Cephalopod-bearing coquina interbeds consisting predominantly of orthocone cephalopods were found within the dasycladacean inner platform lagoon facies. Based on sedimentological studies the coquina beds are interpreted as storm accumulations. Dasycladacean biostratigraphic data permit assigning the studied succession to the Late Anisian-Early Ladinian interval. Ammonites of age-diagnostic value found in the coquina horizon suggest the Avisianum Subzone of the Reitzi Zone that corresponds to the upper part of the Anisian.

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101 Haas, J., K. Hips, P. Pelikán, N. Zajzon, E. Tardi-Filácz 2004: Facies analysis of marine Permian/Triassic boundary section in Hungary. - Acta Geol. Hung., 47/4, pp. 297

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G. Kniewald 2008 Volcanic facies analysis of a subaqueous basalt lava-flow complex at Hruškovec, NW Croatia — evidence of advanced rifting in the Tethyan domain J. Volc. and

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Facies Analysis. Spec. Publs Int. Ass. Sediment., Blackwell Scientific Publications, Oxford, London, Edinburgh, Boston, Melbourne, Paris, Berlin, Vienna, pp. 109–125. Meléndez N

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területén feltárt felső pleisztocén fosszilis talajok szedimentológiai és geokémiai fácieselemzése (Sedimentological and geochemical facies analysis of fossil soils recovered in the Hajdúsag area). - In: Szöőr Gy. (Ed.): Fádciesanalitikai, paleobiogeokémiai

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I. Barta é. Balázs P. Sümegi 1992 Geochemical facies analysis of Quaternary pelitic deposits of

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. J. Haas 1982 Facies analysis of the cyclic Dachstein Limestone Formation (Upper Triassic) in the Bakony Mountains, Hungary Facies 6 75

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