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sedimentation - modern and ancient . SEPM Special Publication 15, 293-308. Durand, J., 1995. High resolution sequence stratigraphy (genetic stratigraphy) in reservoir sedimentology: examples from the Niger Delta. Nigerian Association of Petroleum Explorationists Bulletin 10, 65-73. Ejedawe, J. E., 1981. Patterns of incidence of oil reserves in Niger Delta Basin. American Associatioin of Petroleum Geologists Bulletin 65, 1574-1585. Ejedawe, J. E., Coker, S. J. L., Lambeth-Aikhionabare, D. O., Alofe, K. B. & Adoh, E. O., 1984. Evolution of oil-generative window and oil and

Abstract

The Ratkovce 1 well, drilled in the Blatné depocenter of the northern Danube Basin penetrated the Miocene sedimentary record with a total thickness of 2000 m. Biostratigraphically, the NN4, NN5 and NN6 Zones of calcareous nannoplankton were documented; CPN7 and CPN8 foraminifer Zones (N9, 10, 11 of the global foraminiferal zonation; and MMi4a; MMi5 and MMi6 of the Mediterranean foraminiferal zonation were recognized. Sedimentology was based on description of well core material, and together with SP and RT logs, used to characterize paleoenvironmental conditions of the deposition. Five sedimentary facies were reconstructed: (1) fan-delta to onshore environment which developed during the Lower Badenian; (2) followed by the Lower Badenian proximal slope gravity currents sediments; (3) distal slope turbidites were deposited in the Lower and Upper Badenian; (4) at the very end of the Upper Badenian and during the Sarmatian a coastal plain of normal marine to brackish environment developed; (5) sedimentation finished with the Pannonian-Pliocene shallow lacustrine to alluvial plain deposits. The provenance analysis records that the sediment of the well-cores was derived from crystalline basement granitoides and gneisses and from the Permian to Lower Cretaceous sedimentary cover and nappe units of the Western Carpathians and the Eastern Alps. Moreover, the Lower Badenian volcanism was an important source of sediments in the lower part of the sequence.

References Alexander, J., Bridge, J.S., Cheel, R.J. & Leclair, S.F., 2001. Bed forms and associated sedimentary structures formed under supercritical water fows over aggrading sand beds. Sedimentology 48, 133–152. Bennett, M.R., Huddart, D., Glasser, N.F. & Hambrey, M.J., 2000. Resedimentation of debris on an ice-cored lateral moraine in the high-Arctic (Kongsvegen, Sval-bard). Geomorphology 35, 21–40. Cant D.J. & Walker R.G., 1978. Fluvial processes and fa-cies sequences in the sandy braided South Saskatchewan River, Canada. Sedimentology 25, 625

References Adegoke, A.K., 2012. Sequence Stratigraphy of Some Middle to Late Miocene Sediments Coastal Swamp Depobelts, Western Offshore Niger Delta. International Journal of Science and Technology 2, 18-27. Avbovbo, A.A., 1978. Tertiary lithostratigraphy of Niger Delta. American Association of Petroleum Geologists Bulletin 62, 295-300. Boggs, S., 1995. Principles of Sedimentology and Stratigraphy. 2nd Ed. Prentice Hall, 774 pp. Buatois, L.A., Gingras, M., Maceachern, J.A., Mangono, M.G., Zonneveld, J.P., Pemberton, S.G., Netto, R.G. & Martin, A., 2005

References Aitken, J. F., 1998. Sedimentology of Late Devensian glaciofluvial outwash in the Don Valley, Grampian Region. Scottish Journal of Geology 34, 97-117. Allen, J. R. L., 1965. A review of the origin and character of recent alluvial sediments. Sedimentology 5, 89-191. Bluck, B. J., 1979. Structure of coarse grained braided stream alluvium. Transactions of the Royal Society of Edinburgh 70, 181-221. Boothroyd, J. C. & Ashley, G. M., 1975. Processes, bar morphology and sedimentary structures on braided out-wash fans, Northeastern Gulf of Alaska. [In

References Abdullatif, O., 1989. Channel-fill and sheet-flood facies sequences in the ephemeral terminal River Gash, Kassala, Sudan. Sedimentary Geology 63, 171–184. Allen, J.P., Fielding, C.R., Rygel, M.C. & Gibling, M.R., 2013. Deconvolving signals of tectonic and climatic controls from continental basins: an example from the late Paleozoic Cumberland Basin, Atlantic Canada. Journal of Sedimentary Research 83, 847–872. Allen, J.R.L., 1964. A review of the origin and characteristics of recent alluvial sediments. Sedimentology 5, 89–191. Allen, J.R.L., 1968

References Allen, J.R.L., 1965. A review of the origin and character of recent alluvial sediments. Sedimentology 5, 89–191 Bąk, Ł., Górski, J. & Szeląg, B., 2012. Wpływ kaskady zbiorników małej retencji Suchedniów i Rejów na redukcję fali wezbraniowej na rzece Kamionka [Impact of the cascade of Suchedniow and Rejów small retention reservoirs on the reduction of the flood wave in the Kamionka river]. Acta Scientiarum Polonorum, Formatio Circumiectus 11, 13–22. Bielenin, K., 1993. Starożytne górnictwo i hutnictwo żelaza w Górach Świętokrzyskich [Ancient mining

. Interrelationships of channel processes, changes and sediments in a proglacial braided river. Geografiska Annaler 68A, 361-371. Bagnold, R.A., 1966. An approach to the sediment transport problem from general physics. [In:] C.R., Thorne, R.C., MacArthur & J.B., Bradley (Eds): The Physics of Sediment Transport by Wind and Water. American Society of Civil Engineers, New York, 231-291. Baker, V.R., 1973. Paleohydrology and sedimentology of Lake Missoula flooding in eastern Washington. Geological Society of America, Special Paper 144, 73 pp. Baker, V.R. & Costa, J.E., 1987. Flood Power

K. H. & Krüger J., 2001. The final phase of dead-ice moraine development: processes and sediment architecture, Kötnojökull, Iceland. Sedimentology 48: 935-952. Klimaszewski M., 1960. Studia geomorfologiczne w zachodniej części Spitsbergenu między Kongsfjordem a Eidembuktą. Prace Geograficzne Uniwersytetu Jagiellońskiego, Kraków , 23: 166 pp. Kłysz P., 1985. Glacial forms and deposits of Ebba Glacier and its foreland (Petuniabukta region, Spitsbergen). Polish Polar Research 6: 283-299. Krüger J. & Kjær K. H., 1999. A data chart for field description and

Sedimentology of a Permian playa lake: the Boda Claystone Formation, Hungary

The Upper Permian Boda Claystone Formation (BCF) in SW Hungary has been previously been identified as a saline lake deposit. A country-wide screening found this 800-1000 m thick succession the most suitable for the disposal of high-level radioactive waste in Hungary, and research into this formation has consequently been intensified since. The investigations included a detailed study of the sedimentological characteristics. Data obtained by mapping of the 25 km2 outcrop area of the formation and from more than 40 boreholes were processed. The sedimentary structures were investigated on outcrop to microscopic scales, and cycles in the succession were interpreted.

The main lithofacies, sedimentary structures and ichnofossils are presented. They indicate that the major part of the succession was deposited in a playa mudflat and is not of lacustrine origin in a strict sense. The lake sediments are represented by laminated and ripple-marked/flaser-type cross-laminated claystones and siltstones and by massive dolomites; trace fossils include crawling traces and burrows. Partial or complete drying out of the lake commonly occurred after the formation of carbonate mud by evaporation. Periodic fluvial influx is recorded by cross-bedded sandstones and unsorted gravelly sandstones of up to pebble-sized angular grains. Fenestral and stromatolitic structures reflect the repeated appearance of playa mudflat conditions. The silty claystones, which compose the major part of the succession, lost their primary structures due to pedogenic processes and indicate prolonged subaerial intervals with soil formation and only ephemeral inundations. The presence of pedogenic carbonate concretions supports the interpretation of an arid climate and a relatively shallow groundwater table. Drying-out events shown by desiccation cracks and authigenic breccias can be traced all over the succession.

The various facies form small-scale sedimentary cycles showing a shallowing-upward trend and the growing influence of aridity and subaerial exposure.