نتایج جستجو برای: danian

تعداد نتایج: 133  

Journal: :Minerals 2022

Secondary minerals occur within the tholeiitic basalts of Salsette Island in greater Mumbai region, as well other localities Deccan Volcanic Province (DVP). However, secondary show remarkable differences with respect to their mineral speciation and precipitation sequence, which are both due unique geological environment. The region is built up by subgroup, represents youngest sequence DVP. It f...

2015
Elizabeth C. Sibert Pincelli M. Hull Richard D. Norris

Open-ocean ecosystems experienced profound disruptions to biodiversity and ecological structure during the Cretaceous/Palaeogene mass extinction about 66 million years ago1–3. It has been suggested that during this mass extinction, a collapse of phytoplankton production rippled up the food chain, causing the wholesale loss of consumers and top predators3–5. Pelagic fish represent a key trophic ...

2006
Ryan James Jacoby

This study documents a convincing correlation of stable oxygen isotopic variation extracted from Paleocene aged bulk sediment carbonates of the Scaglia Rossa formation in the Apennines Mountains of Italy with the variations found in Pacific, benthic organism derived carbonates presented by Zachos et al. (2005). Using δO variation as a proxy for sea-level change, a first-order correlation can al...

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