Ishikari Group

Geology

Formations: unnamed (1), Akabira (1), Ashibetsu (1), Bibai (1), Hiragishi (1), Horokabetsu (2), Takane (1), Wakkanabi (3), Yubari (1)

Lithologies: not reported (3), siltstone (9), sandstone (7)

Paleoenvironments: marine indet. (1), terrestrial indet. (1), marginal marine indet. (3), coastal indet. (2), fluvial indet. (5)

Age range: base of the Early/Lower Eocene to the top of the Bartonian or 56.00000 to 37.71000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Early/Lower Eocene56.0 - 48.07Japan (Hokkaido) (205814)
Lutetian48.07 - 41.03Japan (70898 70899 70900 70901 70902)
Lutetian48.07 - 41.03Japan (Hokkaido) (205060)
Middle Eocene48.07 - 37.71Japan (183025)
Bartonian41.03 - 37.71Japan (70903 70904 70905 70906)