Sedimentology is a 'core-discipline' of earth and environmental sciences. It enquires into the origins, transport and deposition of mineral sediment on Earth's surface. The subject is a link between positive effects arising from the building of relief by tectonics and the negative action of denudation and tectonic subsidence in sedimentary basins. This book addresses the principles of the subject, emphasising the advantages of an approach through general science and presently-acting processes. It is not an encyclopaedia but attempts to stimulate interdisciplinary thought across the whole subject area and related disciplines.