Kurihara, Ken’IchiToshimitsu, SeiichiHirano, Hiromichi2012Fig. 1 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan10.5281/zenodo.13279121Fig. 1. Map of the study areas (Mikasa, Obira, and Oyubari areas in Hokkaido, Japan).