The Mizunami Group is well-known as a Miocene sequence which yields well-preserved fossils in abundance. The fossils of the group have been studied well in viewpoints of paleoecology and paleoenvironmentology. Some examples of the studies are introduced and a forthcoming plan of studies including reexamination of stratigraphy, studies for trace fossils and taphonomy, and synthesis of various paleoecological data is presented.