نتایج جستجو برای: nannofossils
تعداد نتایج: 185 فیلتر نتایج به سال:
A reconstruction of the last 2,000 years BP environmental and oceanographic changes on western margin Spitsbergen was performed using a multidisciplinary approach including fossil assemblages diatoms, planktic benthic foraminifera calcareous nannofossils use geochemistry (X-ray fluorescence spectroscopy, X-ray diffraction). We identified two warm periods (2,000–1,600 1,300–700 BP) that were ass...
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...
Fossil specimens of the exclusively oceanic calcareous nannoplankton were found only in the upper 200 m of the Cape Roberts Project 3 (CRP-3) cores. These assemblages are depauperate and sporadic in occurrence. The majority of the assemblages contain fewer than 4 species, indicating a severe palaeoecological restriction. The clear domination of these assemblages by reticulofenestrid species, co...
Calcareous nannofossils and biostratigraphy of the Paleogene sequences of the northern Kyushu, Japan
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید