This is a text book of Applied Micropalaeontology with number of aspects of the microfossils to make their taxonomy interpretative. Since they were once-living microorganisms, it also forms a part of the biological subjects. Besides, it also covers important developments that took place within the last seven decades in the study of foraminifera, ostracoda, calcareous nannoplanktons, diatoms and conodonts by transforming their ecological-data in the rich-text ...