Yezo Group
Geology
Formations: unnamed (74), Chinomigawa (9), Haborogawa (12), Hakobuchi (11), Hikagenosawa (16), Kashima (5), Middle Haborogawa (8), Mikasa (4), Nagareya (2), Nigorikawa (1), Nigorisawa (1), Omagari (1), Osoushinai (4), Osousyunai (1), Saku (15), Tenkaritoge (1), Tsukenai (1), Upper Haborogawa (18)
Lithologies: not reported (7), "siliciclastic" (43), claystone (1), mudstone (72), siltstone (18), sandstone (41), lime mudstone (1), "reef rocks" (1), "limestone" (3), "carbonate" (5), tuff (12)
Paleoenvironments: marine indet. (117), terrestrial indet. (2), reef, buildup or bioherm (2), marginal marine indet. (1), coastal indet. (10), transition zone/lower shoreface (10), offshore (42)
Age range: base of the Late/Upper Aptian to the top of the Early/Lower Maastrichtian or 119.57000 to 66.00000 Ma
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