Accretionary complex represented by the Shimanto Belt is comprised of both terrigenous sediments and pelagic ones. Unusual facies, being quite deferent from those of normal deposits, are characteristic of accretionary deposits. Therefore, in order to understand the origin of accretionary deposits, it is necessary to understand that there is a specific process to yield such facies, exclusively in a site of subduection of plate. For university students of training teachers, we have developed a training program for learning and understanding of an accretionary prism, selecting most suitable sites for this purpose.