北海道における新第三系の微化石層序と年代層序

特に釧路炭田南西部地域を例として

抄録

Biostratigraphic studies of microfossils, especially of diatoms, recently carried out on the Neogene strata of Hokkaido have revealed that traditional chronostratigraphic subdivisions of those strata must be partially revised, although there still remains several problems to be solved. In this article, such recent results available mainly on the Neogene System developed in the Southwestern Part of the Kushiro Coal Field Area are presented, and epoch boundaries in the Neogene of several other areas of Hokkaido are also suggested.