This book, first published in 1982, is a collection of articles aimed at advancing the field of geomorphology.It starts from the position that a meaningful grasp of landscape evolution would depend upon an understanding of the present spatial distribution of processes and process rates; comparison of spatial versus temporal change; and careful appraisal of the character and composition of the stratigraphic record.Each article uses a data set to address between threshold variability in either a spatial or temporal context, and often both.