This book includes seven chapters. The first chapter is an introduction to micropaleontology. Chapter two gives a brief idea of the small foraminifera, their application, preparation technique, taxonomy, classification and ecology. The third chapter deals with the morphology and classification of larger foraminifera. Chapter four deals with the morphology, taxonomy, and distribution of ostracoda. Chapter five gives a detailed description of the morphology, classification and major morphologic groups of calcareous nannoplankton. Chapter six deals with radiolaria and conodonts. Chapter seven summarizes the applications of micropaleontology in geology and petroleum industry.