Planktic foraminifera are commonly used for first-order age control in deep-sea sediments from low-latitude regions based on a robust tropical–subtropical zonation scheme. Although multiple Neogene planktic foraminiferal biostratigraphic zonations mid-latitude exist, quantification of diachroneity the species as datums to test paleobiogeographic patterns origination and dispersal is lacking. He...

Abstract Chalk has been used since Antiquity for various purposes, and Gothic preparatory layers of painted cultural heritage objects. Several materials are called chalk in Cultural Heritage, but this work especially focuses on composed calcareous nannofossils (up to 98%). These fossil remains photoautotrophic algae generally smaller than 30 μm. They mainly visible as platelets shapes under a c...