Abstract
A general account on the stratigraphy of the Ooigawa formation and its relations in east part of Totomi (Sizuoka-ken) is given with special notes of the limestones which take place between the Megami sandstone and mudstone cf the lower division., Some of the limestones, for example that of Nita, have in them Lepidocuclina nipponica HANZAWA and Miogypsina kotoi HANZAWA and a number of other less important foraminifera., With this discovery it is possible to give a statement that the Misaka formation is equal to the Ooigawa in geological age., A new stage name "Ooigawa" is put forward for the Lower Miocene of Japan which is older than the stage with Lepidocyclina japonica.,
