DISTRIBUTION AND RECOGNITION OF PHASES IN APTIAN-TURONIAN (CRETACEOUS) BRACHIOPOD DEVELOPMENT IN NW EUROPE
Abstract: Although represented during the Cretaceous (in three faunal provinces: Boreal, Jura, Tethyan), brachiopods have not commonly been considered as competitors of ammonites and foraminifers in the establishment of a standard zonation scheme. Occasionally brachiopods are well represented in thin layers where other faunal groups are absent or poorly represented. The palaeontological evaluation (complementary morphological remarks with an illustration and distribution of most species) is given here for the Aptian-Turonian period, and the correlative value of the most important species is discussed. This analysis leads to a discussion-conclusion concerning: a) ecological considerations (for example, the fact that some genera are preferentialy found in typical facies), b) designation of stratigraphic markers, c) location of the considered fauna elsewhere in the world and, d) a proposal for the recognition of phases in brachiopod development in the present stage of knowledge, with remarks concerning the distribution in correlation with transgressive-regressive movements.
ALBIAN AND CENOMANIAN FORAMINIFERA FROM THE KOSARZYSKA SECTION, NIEDZICA SUCCESSION, PIENINY KLIPPEN BELT, CARPATHIANS, POLAND
Abstract: The Kosarzyska section of the Niedzica Succession, Pieniny Klippen Belt, Poland yielded the Late Albian planktonic foraminiferal biozones from Rotalipora ticinensis-Planomalina praebuxtorfi to Planomalina buxtorfi — Rotalipora appenninica (sensu Gasinski 1988). The Early Cenomanian microfaunal zones have not been recognized in this section due to tectonic disturbances. The Late Cenomanian Rotalipora cushmani zone has been recognized contacting with the Upper Albian strata. Quantitative distribution of bathymetrically diagnostic planktonic species does not correlate to the standard eustatic curve.
MICROBIOSTRATIGRAPHICAL (FORAMINIFERA) DIVISION OF THE TURONIAN TO SANTONIAN IN TUNISIA (EL KEF AND DJ. FGUIRA SALAH AREA)
Abstract: The profile through the Turonian in the area of Hammam Mellegue together with perfectly exposed Coniacian and Santonian formations is one of the best in Tunisia. It was proposed by the author as the stratotype profile for the Tethyan realm (Salaj 1986). We stress that planktonic and benthonic foraminifers are perfectly preserved here.The Lower Turonian is characterized by the upper part of the Whiteinella gigantea Zone (W. archaeocretacea Pessagno l967 which is a synonym of Whiteinella inornata Bolli is not present in the Uppermost Cenomanian to the Lower Turonian) with the Dicarinella imbricata and Dicarinella hagni Zones with abundant species of the genus Whiteinella Pessagno 1967. The Helvetoglobotruncana helvetica Zone of the Middle Turonian is characterized by the Dicarinella oraviensis trigona, Dicarinella biconvexa and Sigalitruncana turona Subzones (Salaj l976; Salaj & Bellier 1978).The appearance and explosive development of the species Whiteinella inornata (Bolli) and Whiteinella repanda (Bolli) in the uppermost part of the Sigalitruncana turona Subzone together with various representatives of the genus "Gabonella" de Klasz, Marie & Meijer 1960, which are also abundant in the Upper Turonian is interesting. The uppermost Turonian is characterized by Dicarinella primitiva (Dalbiez) and Dicarinella paraconcavata (Hofker).The Lower Coniacian is defined by the Dicarinella concavata — elvetoglobotruncana cachensis Zone, whilst the Middle-Upper Coniacian is determined by the Globotruncanella praehavanensis Zone.The uppermost Coniacian is determined by Sigalia deflaensis (Sigal) and the base of the Santonian is determined by Sigalia carpathica Salaj & Samuel (Salaj & Maamouri 1995).
STRATIGRAPHY OF CRETACEOUS SEDIMENTS OF THE MAGURA GROUP OF NAPPES IN MORAVIA (CZECH REPUBLIC)
Abstract: In the Magura Group of nappes, Cretaceous sediments were proved in the Raca and Bile Karpaty units nearly in the whole range of the period. This was made possible by new biostratigraphic (foraminifers and calcareous nannofossils) and biofacies data. In the present paper, the Kurovice Klippe, Gault Flysch, Kaumberg Formation and the lower part of the Solan Formation are included in the Raca Unit, while the Hluk, Kaumberg and Javorina formations and the lowermost part of the Svodnice Formation are placed in the Bile Karpaty Unit. Some lithostratigraphic units of Senonian age appear in tectonic slices only (Puchov Marl and Antoninek Formation) which makes their incorporation into the paleogeographical model of the Magura Group of nappes difficult.
PALEOGENE SEDIMENTS BELOW THE BASE OF A MESOZOIC NAPPE IN THE HUMENSKE VRCHY MTS. (PODSKALKA BOREHOLE): STRATIGRAPHIC CONSTRAINTS FOR TERTIARY THRUST TECTONICS
Abstract: The footwall unit below the Mesozoic nappe complex of the Humenske vrchy Mts. has been reached by the MLS-1 Podskalka borehole. The lowermost (1769–1833 m) sandstone/claystone formation in this borehole it is constrained to be Late Cretaceous? but rather Paleogene in age (according to the youngest nannofossils). The hangingwall of these sediments consists of the Krizna Nappe complex which comprises formations from Middle Triassic up to Albian in age. The observations from the MLS-1 borehole point to the underthrusting of the externally seated flysch units beneath the collisional edge of the Centrocarpathian plate. The Paleogene formations may be attributed to the same unit which being deeply underplated, buried, and than exhumed in the East Slovak Basin floor (Inacovce-Krichevo Unit). The Paleogene formations of this unit suffered sub-greenschist metamorphism and they are overlapped by ultrabasic thrust slices (Zbudza-1 borehole).