Geological field work is important to understand rocks in their natural environment and their natural relationship to one another. It seeks to describe and explain the surface feature and underground structure of the lithosphere based upon observations and inferences. This book focuses on the importance of field work, tools and techniques uses in the field, geological mapping techniques, study of outcrops and preparation of geological maps and cross sections. This book provides whole idea of geologic field such as the objectives of the field geology, field camp, daily schedule of field study, prerequisites of field camp, field equipment, maps and its components, reconnaissance survey, geological mapping and related methods, outcrop studies including mineral identification, dip & strike determination and base map preparations. This book provides basic understanding of various tools and techniques to students, teachers and field geologist concerned with field geology.