Late Cenozoic paleobathymetry and paleogeography in the South Fossa-Magna and Enshunada regions, Japan, based on planktic and benthic foraminifera

Late Cenozoic sequences distributed in the South Fossa-Magna and Enshunada regions are correlated on the basis of planktic biostratigraphy and the paleogeographic evolution of this area is delineated for seven phases (Phases I–VII) based on paleobathymetry estimated from the benthic foraminiferal assemblages. otrench beneath the Kofu Seaway of Oda and Akimoto (1992), was present during early to middle Middle Miocene time and situated near the boundary between the Eurasia and North American plates. The Misaka paleotrench of Akimoto (1991), which was located on the boundary between the North American and Paleo-Philippine Sea plates, existed during the early Middle Miocene to Late Miocene, and rapidly shallowed during Pliocene time (CN10). Variations in the paleobathymetry of the forearc basins and bank on the Eurasia plate show that uplift was distributed within a narrow belt (ca. 7 km in width) along the Suruga Trough, and shifted from west to east during Late Pliocene–Early Pleistocene time.