Hauterivian-Barremian marine molluscan fauna from the Tetori Group in Japan and late Mesozoic marine transgressions in East Asia

The presence of common marine bivalve species and related ammonite species suggests that the eastern part of the Heilongjiang Province of China and the Tetori area of Japan occupied the same faunal province during Hauterivian to Barremian time. These faunal compositions are different from those of the areas in the southwest of Japan influenced by currents from low latitudes. This supports the idea that a peninsula of land was present between both the Tetori area and areas in southwest of Japan. Thus, both areas of the eastern part of the Heilongjian Province of China and the Tetori area of Japan, were influenced by current from the high latitude.