Dañskie amonity — obecny stan wiedzy i perspektywy badañ

摘要: Danian ammonites — The present state of knowledge and perspectives for future research. A b s t r a c . To date, the strongest arguments ammonite survival into (earliest Paleogene) are based on material from lower Cerithium Limestone at Stevns Klint (Denmark), where occur above clay layer with impact products its base, latter defining Cretaceous Paleogene (K-Pg) boundary. best-preserved specimen is filled sediment rather than Maastrichtian chalk, which would be expected had this been reworked material. Arguments have also provided by specimens sporomorph calcareous nannoplankton-dated lowermost strata Meerssen Member unit IVf-7, Netherlands. Their good preservation indicates that they were not subject to any significant transport or redeposition. However, there no unequivocal impact-related signatures in except rare shocked quartz grains, recorded burrows base. Sections Manasquan Basin, New Jersey, USA, provide equivocal data as far problem concerned. At top Tinton Formation Pinna replete fossils, inclusive ammonites. exquisite occurrence monospecific clusters rule out contains exclusively late microfossils. clear iridium anomaly has noted Either Jersey survived K-Pg event short time situ due post depositional repositioning percolating water. Planned work focus on: 1) detailed centimetre sampling some basins Denmark search additional material, 2) palaeontological taphonomic analysis IVf-7 Netherlands, 3) geochemical study order determine whether position respect ammonite-bed original secondary.