TY - RPRT TI - Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan AU - John D. Obradovich AU - T. Matsumoto AU - T. Nishida AU - Y. Inoue PY - 2002 DO - 10.2183/pjab.78.149 UR - https://pubs.usgs.gov/publication/70024588 ID - 70024588 ER -