...Table 1 Sedimentary facies classification of depositional succession covering the basal part of the Shibikawa Formation to the middle part of the Katanishi Formation. Facies code, lithologic features, and depositional environments with depositional depth are summarized. ...

...) Early Pleistocene Sawane Formation (Locality 6). (D) Middle Pleistocene Shibikawa Formation (Locality 11). (E) Middle Pleistocene Shibikawa Formation (Locality 12) ...

... exposed along the coast of the Oga Peninsula, where they generally dip eastward and become younger to the east, from Miocene to Holocene. The Quaternary sediments are divided, in ascending order, into the Kitaura, Wakimoto, Shibikawa, Katanishi, and Iriai formations ( Fig. 1B ; e.g., Shiraishi 2000...

... constricta Dall , 1918 , p. 228–229; Kosuge , 1972 , pl. 9, fig. 5. Searlesia shimosensis Oinomikado , 1935 , p. 598–599, pl. 1, figs. 5–6. Pliocene to Recent. Pliocene: Kuwae and Nadachi Formations, Niigata Prefecture. Pleistocene: Tomikawa Formation, Hokkaido; Shibikawa and Katanishi...

... on fossil shells of the bivalve Glycymeris yessoensis . This bivalve species is most abundant among the fossil molluscan assemblages and has durable shells, making it relatively easy to examine the predatory drillholes quantitatively. The middle Pleistocene Shibikawa Formation...

... in Japan, 1969). W = Wakimoto F., S = Shibikawa F., K = Katanishi F. (Akitaj, H = Haizume F., 0 = Oguni F. (Niigataj. Geochemical features of the existence of the 'principal phase of oil formation' oil-producing formations obtained from the above presumed source beds seems to support the hypothesis...

... are found exclusively in marine Neogene formations. The chief oil fields in Hokkaidō are those of Masuhoro, Ishikari, and Yufutsu, of which Yufutsu is the most important. In the Prefecture of Akita, the oil fields of Kurokawa, Toyokawa, Michikawa-Asahigawa, and Oguni are noteworthy, though at present...