This publication is a text-book on paleoichnology. It contains basic information on trace fossils, mainly those produced by invertebrates, and discusses the possibilities of their utilization for paleoecological, stratigraphic and sedimentological analyses. Latest research and modern trends in paleoichnology are considered, with special attention given to investigations in the last 10-15 years. The book is intended for students of geology and a wide community of stratigraphers, paleontologists, and sedimentologists. It should be equally useful for all those who are interested in trace fossils.