نتایج جستجو برای: calcareous nannofossils

تعداد نتایج: 3502  

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...

2015
Kirsten Zaczek Valentin R. Troll Mario Cachao Jorge Ferreira Frances M. Deegan Juan Carlos Carracedo Vicente Soler Fiona C. Meade Steffi Burchardt

The origin and life cycle of ocean islands have been debated since the early days of Geology. In the case of the Canary archipelago, its proximity to the Atlas orogen led to initial fracture-controlled models for island genesis, while later workers cited a Miocene-Quaternary east-west age-progression to support an underlying mantle-plume. The recent discovery of submarine Cretaceous volcanic ro...

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: Geopersia 2013

This study presents the nannostratigraphy and nannofossil events in the lower boundary of Kalat Formation in the East and West of the Kopeh- Dagh basin. The Kalat Formation comprises of coarse grained detritus limestone with subordinate sandstone intercalations. In the current study, six sections have been chosen in the East and West of the basin which are as follow: Dobaradar section, Kalat se...

Journal: :Palaeobiodiversity and Palaeoenvironments 2023

Abstract The Nukhul Formation has been a point of controversy until now due to lack index fossils, varied facies modifications, and different time gaps. As result, the calcareous nannofossils exposed Miocene rocks at Wadi Baba, west-central Sinai have studied quantitatively for first time. An important sequence nannofossil bioevents recorded in Formation, including FOs Discoaster druggii , Sphe...

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