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Late Cretaceous foraminiferids from sections in the Zabratówka area (Skole Nappe, Outer Carpathians)

Kowalczewska O., Gasiński A.

Annales Societatis Geologorum Poloniae

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2018

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Vol. 88, No. 1

71--85

EN

Well preserved Late Cretaceous–Palaeogene planktonic and benthic foraminiferal assemblages were studied in the Zabratówka section of the Ropianka Formation in the Skole Nappe. The Racemiguembelina fructicosa and Abathomphalus mayaroensis standard foraminiferal biozones were distinguished. The K-T boundary was recognized within the interval between samples ZB10B–ZB9A, mainly composed of marly mudstones, interlayered with thin-bedded sandstones, and is characterized by the disappearance of planktonic taxa and an abundance of agglutinated species. Foraminiferal assemblages, collected from the turbiditic flysch-type sediments, indicate a primary depositional environment on the outer shelf to the upper part of the continental slope, with shallowing during the Maastrichtian in the part of the Skole Basin studied. The foraminiferids correspond to the assemblages of a palaeobiogeographical “transition” zone, located between the Boreal and Tethyan domains.

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Foraminiferal stratigraphy and palaeobathymetry of Paleocene-lowermost Oligocene deposits (Vezhany and Monastyrets nappes, Ukrainian Carpathians)

Hnylko S., Hnylko O.

Geological Quarterly

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2016

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Vol. 60, No. 1

77--105

EN

Mainly pelagic/hemipelagic deposits of the Vezhany Nappe (Paleocene-Lowermost Oligocene Metova Formation with a high content of planktonic foraminifera) and typical flysch deposits of the Monastyrets Nappe (Paleocene-Eocene Sushmanets Formation with common agglutinated foraminifera as well as the Eocene Drahovo Formation), of the southwestern inner part of the Ukrainian Carpathians have been studied. The Parvularugoglobigerina eugubina Zone (Lower Danian), Acarinina acarinata Zone (Upper Thanetian), Morozovella subbotinae Zone and Morozovella aragonensis Zone (Ypresian), Acarinina bullbrooki Zone and Acarinina rotundimarginata Zone (Lutetian), Subbotina corpulenta Zone and Subbotina vialovi Zone (Upper Priabonian – Lower Rupelian) based on planktonic foraminifera as well as the Rzehakina fissistomata sensu lato Zone (Paleocene), Glomospira charoides–Recurvoides smugarensis Zone (Ypresian), and an assemblage with Haplophragmoides parvulus (latest Mid Eocene-early Late Eocene) based on agglutinated foraminifera have been identified in these deposits. The deep-water agglutinated foraminifera of the “Rzehakina”, “Rhabdammina” and “Paratrochamminoides” assemblages found in the typical flysch deposits of the Sushmanets Formation indicate lower slope to abyssal environments below the CCD. The generic composition and morphological features of planktonic and benthic foraminifera recovered from marls of the Metova Formation suggest pelagic/hemipelagic conditions at bathyal depths above the foraminiferal lysocline.

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The Trawne Member (Albian-Cenomanian, Pieniny Klippen Belt, Carpathians) : a new insight into its foraminiferal assemblages and biostratigraphy

Pióro K.

Studia Geologica Polonica

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2005

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Vol. 124

237-248

EN

Detailed micropalaeontological analysis of samples from the Pasieczny and Trawne stream sections has been undertaken. Twenty five species including seventeen planktonic taxa have been identified. The Rotalipora ticinensis - Planomalina praebuxtorfi new biozone has been proposed. In the Pasieczny Stream section, turbiditic sedimentation commenced during the Early Cenomanian (Rotalipora appenninica Zone). The new biozone R. greenhornensis has been established. The Rotalipora reicheli - Rotalipora greenhornensis Zone, based on coexistence of both nominal species was recognized. The studied foraminiferal associations have confirmed palaeobathymetrical associa- tions B1-B2 (middle part of the continental slope).

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Foraminiferal palaeodepth indicators from the lower Palaeogene deposits of the Subsilesian Unit (Polish Outer Carpathians)

Waśkowska-Oliwa A.

Studia Geologica Polonica

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2005

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Vol. 124

297-324

EN

The presented research results are an attempt at establishing the relative depth of sediment deposition in the Subsilesian zone of the Carpathian basin. To estimate palaeodepth calcareous and agglutinated foraminifera were investigated, taking into account the preservation conditions, life environment, and bathymetrical preferences of individual species of the calcareous benthic forms. Micropalaeontological analysis were carried out on foraminiferal assemblages from the Palaeocene- Middle Eocene deposits of the Lanckorona-Żegocina Tectonic Zone and the Żywiec Tectonic Window (Subsilesian Unit), which are represented by the Szydłowiec sandstones (Palaeocene part), the Czerwin sandstones, the Gorzeń sandstones, the Radziechowy sandstones, the Lipowa beds as well as shales, that occur above or between these sandstones. The microfauna assemblages indicate that a change in the sedimentation depth of the individual lithosoms is conspicuous in the Early Palaeocene. During the Early Palaeocene the depth was between the CCD and the foraminiferal lysocline (FL); however, during the Late Palaeocene and the Early Eocene a deepening related to the CCD is evident or local shallowing of the CCD. Deposition took place in the lower part of the range between the CCD and FL, achieving the maximum palaeodepth in the latest Palaeocene. The depth changes of the Subsilesian basin zone can be correlated with global trends of the raising level of the World Ocean, and also with a period of increased subsidence of the Carpathian basins.

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Cretaceous-Paleogene boundary problem in Libya: the occurrence of the foraminiferal species Abathomphalus mayaroensis (Bolli) in the Western Sirt Basin

Tshakreen S. O., Gasiński M. A.

Geological Quarterly

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2004

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Vol. 48, No 1

77-82

EN

The position of the K/P boundary in wells in the Western Sirt Basin of Libya is problematic. The biostratigraphic definition of the K/P boundary in the subsurface is based on the extinction of the eponymous taxon of the standard latest Maastrichtian foraminiferal Abathomphalus mayaroensis Zone. We have unambiguously recognised this taxon from the Sirt Basin subsurface sections for the first time. All the latest Maastrichtian foraminiferal assemblages are dominated by planktonic foraminiferids. Some of specimens are pyritised, indicating organic flux to the basin floor, causing oxygen deficiency in the depositional environment. The occurrence of characteristic bathypelagic and some epipelagic species indicates that the environment of deposition is outer shelf–middle continental slope.

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Relative sea-level changes recorded in borings from a Miocene rocky shore of the Mut Basin, southern Turkey

Uchman A., Demírcan H., Toker V., Derman S., Sevim S., Szulc J.

Annales Societatis Geologorum Poloniae

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2002

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Vol. 72, No 3

263-270

EN

Cretaceous limestones from the basement of the Neogene Mut Basin are strongly sculptured by borings, including mainly clionid sponge borings Entobia ispp., bivalve borings Gastrochaenolites torpedo and G. lapidicus, the polychaete boring Caulostrepsis taeniola and Meandropolydora isp. The borings are replaced subsequently; as a rule the succession begins with C. taeniola and terminates with Entobia ispp. The discussed boring producers display various tolerance for light, energy and depth conditions, hence their succession may reflect environmental changes, related to marine transgression, proceeded upon rocky coast area. Since such a coast could be devoid of sedimentation for a long time, the possible reconstruction of relative sea-level change may be inferred exclusively from nonsedimentological criteria i.e. from the succession of endolithic borings. Therefore the borings may be employed as useful tool in sequence stratigraphic procedure.

PL

Omawiana asocjacja drążeń jest typowa dla ichnofacji Entobia (sensu Bromley & Asgaard, 1993b), która zwykle występuje powyżej podstawy normalnego falowania i jest charakterystyczna dla wieloletnich okresów ekspozycji i bioerozji. Drążenia Gastrochaenolites torpedo, produkowane przez małże Litophaga lithophaga występują wyłącznie w płytkiej (10 m głębokości), bardzo czystej, pozbawionej zawiesiny wodzie, na stromym skalistym podłożu. Bardziej toleracyjne na dostawę materiału osadowego, G. lapidicus i C. taeniola mogą być tworzone na bardziej połogim podłożu i nieco większych głębokościach (Fig. 7). Zaobserwowano nakładanie się jednych drążeń na drugie. Po-wierzchnie skolonizowane najpierw przez wieloszczety (Caulostrepsis) były następnie drążone przez małże (Lithophaga i Hiatella) produkujące Gastrochaenolites ispp. (Fig. 4B). Później, w większych głębokościach wkroczyły drążące gąbki z rodzaju Cliona produkujące Entobia ispp. (Fig. 5A). Drążenia występują także w muszlach ostryg (Fig. 4C, D; Fig 5B), licznych w dolnej części utworów transgresywnych. Zewnętrzna powierzchnia muszli jest zdecydowanie silniej podrążona niż ich strona wewnętrzna, co wskazuje na początek bioerozji jeszcze za życia ostryg. Przedstawiona sukcesja drążeń jest wynikiem stopniowo zmieniających się warunków środowiskowych, związanych z postępującą transgresją (Fig. 8). Wynika z tego, że drążenia mogą być użytecznym narzędziem do rekonstrukcji różnorodnych zmian środowiskowych, w tym względnych zmian poziomu morza, zachodzących w obrębie skalistych stref brzeżnych zbiorników morskich.

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Latest Maastrichtian Foraminiferal Abathomphalus mayaroensis Zone in the Subsilesian Unit (Polish Outer Carpathians)

Gasiński M., Leśniak T., Piotrowski M.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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2001

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Vol. 49, nr 2

89-97

EN

Maastrichtian standard zones: Globotruncanella havanensis, Globotruncana aegyptiaca, Gansserina gansseri and Abathomphalus mayaroensis have been recognized within the Rybie beds of the Subsilesian unit, Polish Carpathians, based on planktonic foraminiferids. The latest zone; and the presence of its index form, are very rarely recognized in the Polish Outer (Flysch) Carpathians. Foraminiferal assemblages of the Abathomphalus mayaroensis Zone of the Rybie beds contain very differentiated planktonic, calcareous and agglutinated benthic taxa. Qualitative, quantitative and "morphogroup" analyses of the microfauna helped reconstruction of depositional environment and bathymetric conditions of the Rybie beds.

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Biostratigraphy and Palaeoecology of the Late Cretaceous Foraminiferids at Krzyworzeka Stream Section (Subsilesian Unit, Polish Outer Carpathians)

Machaniec E., Gasiński M., Leśniak T.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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2001

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Vol. 49, nr 2

99-107

EN

Assemblages of foraminiferids from the Upper Cretaceous section of the Subsilesian unit (Polish Outer Carpathians) have been analyzed. The age of the studied samples bas been estimated as Turonian-Campanian, based on agglutinated as well as planktonic foraminiferids. Morphogroup analysis of the studied foraminiferids showed an increase of the organic flux on the basin floor.