A. Sakai

Lower Cretaceous deposits beneath the Yezo Group in the Urakawa area, Hokkaido

Y. Miyata, Y. Kanie, Y. Taketani, 1981 .

703. TRIASSIC BRYOZOANS FROM THE HIDAKA GROUP IN HOKKAIDO, JAPAN

S. Sakagami, A. Sakai, 1979 .

Molluscan Fossils from the Neogene Deposits Scattered Along the Western Wing of the Hidaka Mountains, Hokkaido

S. Uozumi, Seiichi Suzuki, A. Sakai, 1983 .