Preface to the articles written after the special lectures that were given at the 2007 Spring Assembly of Japanese Geomorphological Union

Three special lectures were given at the 2007 Spring Assembly of Japanese Geomorphological Union that was held in Uji campus of Kyoto University. Dr. Saito gave a talk about the formation of mega deltas in East and Southeast Asia relating them to Holocene sea-level changes. He gave an alert on their recent trend of collapse due to various anthropogenic causes. Prof. Maeda gave a talk about the detail in the history of Jyomon Transgression, making a review of study results of various researchers as well as the numerous results from his own field studies in the Philippines. He also indicated that the effects of hydro-isostasy were detectable in the history of regional sea-level change. Prof. Masuda gave a talk about his intention of dynamic and precise analysis of depositional strata with an error about 100 years for the study on the formation processes of various types of alluvium. He indicated that the analyses have been executed with the High Precision Stratigraphy that has been contrived and refined from Sequential Stratigraphy. The following articles were written and peer reviewed after the presentation of these lectures at the assembly.