نتایج جستجو برای: nannofossils

تعداد نتایج: 185  

Journal: :Austrian Journal of Earth Sciences 2022

Abstract The 2200 m thick Cretaceous units of well Gänserndorf UeT3 have been biostratigraphically analyzed based on cuttings from 3210 to 5140 m. deposits the Tirolic Glinzendorf Syncline (a part buried Northern Calcareous Alps) can be largely correlated with Lower Gosau Subgroup Grünbach Syncline. An exception is basal unit, which has no equivalent in This lower unit subdivided into a non-mar...

Journal: :Applied sciences 2021

The Middle Eocene Climatic Optimum (MECO; ~40 Ma), which interrupted for ~500–600 kyr the long-term cooling trend culminating at Eocene/Oligocene boundary, still requires a comprehensive understanding of biotic resilience. Here we present high-resolution integrated foraminiferal and calcareous nannofossil study across MECO from expanded continuous Tethyan Baskil section (eastern Turkey) that of...

Journal: :Global and Planetary Change 2022

A 95 m thick succession of grey siliceous limestone and marl on Mount Rettenstein in the Northern Calcareous Alps allowed us to study well-preserved diverse radiolarian assemblages across Sinemurian–Pliensbachian boundary. The distribution 31 most characteristic species is presented. Ammonites Jamesoni Subzone, topmost subzone Zone, have been previously found upper part section. data are comple...

Journal: :Marine Micropaleontology 2021

Calcareous nannofossils are micrometric calcite platelets secreted by the photosynthetic algae named coccolithophores and incertae sedis. nannoplankton inhabit photic zone from coast to open-ocean have left an abundant fossil record since Triassic. Therefore, they constitute interesting material for geochemical studies although been overlooked in comparison foraminifera. We analyzed manganese d...

Journal: :Cretaceous Research 2021

The Turonian–Coniacian continental fossil record in Europe is scarce. Here we present a new assemblage of early Coniacian age that was systematically collected from the coal-bearing Gosau Group Tiefengraben locality near St. Wolfgang, Austria. diverse composed at least 60 taxa including sporomorphs and Normapolles-related pollen, seeds leaves angiosperms gymnosperms, charophytes, gastropods, bi...

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