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Sequence stratigraphic analysis was carried out for the Eocene Ishikari Group distributed in the Ishikari Coalfield, forming a part of the Sorachi-Ezo Belt in central Hokkaido, Japan, in order to clarify the characteristics of its fluvial-dominated depositional systems and their response to relative sea-level changes. Twenty four sedimentary facies and five facies associations are recognized in the Ishikari Group as a result of sedimentary facies analysis. Five facies associations, BF, MF, LA, ES and SH indicate a braided fluvial, meandering fluvial, lacustrine, bay-estuarine and open marine system, respectively. On the basis of fades successions and temporal and spatial distribution of the facies associations, four third-order depositional sequences (Isk-1, Isk-2, Isk3 and Isk-4) are recognized in the Eocene Ishikari Group. Each third-order depositional sequence contains several fourth-order depositional sequences. The Eocene Ishikari Group was deposited in a narrow N-S trending basin in response to relative sea-level (base level) changes during Eocene time. When relative sea level rose, transgression occurred and a bay-estuarine system predominated in the basin, whereas, when relative sea level was highstand and fell, a meandering to braided fluvial system predominated.

Fluvial to bay-estuarine system and depositional sequences of the Eocene Ishikari Group, central Hokkaido