The Terrestrialization process is the gradual colonization of continental and subaerial environments by plants and animals; not only does it constitute one of the most important events in the history of life, but it also correlates in time with periods of major palaeoenvironmental perturbations, representing one of the best examples of the co-evolution of life and its environment. This session is intended to gather together all specialists of the various aspects of the terrestrialization process and to discuss the latest developments in this field of research.