||It has been more than a decade since the appearance of the First Edition of this book. Much progress has been made, but some controversies remain. The original idea of Sloss and of Vail (building on the early work of Blackwelder, Grabau, Ulrich, Levorsen and others) that the stratigraphic record could be subdivided into sequences and that these sequences store essential information about basin-forming and subsidence processes remains as powerful an idea as when it was first formulated. The definition and mapping of sequences has become a standard part of the basin analysis process. Subsurface methods make use of advanced seismic-reflection analysis methods, with three-dimensional seismic methods, and seismic geomorphology adding important new dimensions to the analysis. Several advanced textbooks have now appeared that deal with the recognition and definition of sequences and their interpretation in terms of the evolution of depositional systems, the recognition and correlation of bounding surfaces, and the interpretation of sequences in terms of changing accommodation and supply. This is not one of these books. The main purpose of this book remains the same as it was for the first edition, that is, to situate sequences within the broader context of geological processes so that geoscientists might be better equipped to extract the maximum information from the record of sequences in a given basin or region.