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Lower

Synonym: Ikeda Formation (Matsui and Matsuzawa, 1985)

Invalid synonym: Toa Lignite-bearing Member, Senju Lignite-bearing Member

• Type locality: Tokachi plain, Hokkaido
• Coherent formation
• Pleistocene

• Sedimentary facies: Fluvial
• Lithofacies: Sandstone
• Lithofacies (Minor): Lignite, Conglomerate, Tuff

• Thickness: 150 - 200 m
• Thickness (Upper Lignite-bearing Member): 100 m or thicker
• Thickness (Lower Lignite-bearing Member): 30 m
• Upper limit: Bottom of Chiyoda Tuff
• Upper limit: Conformity (Upper)
• Lower limit: Bottom of Inashibetsu Tuff
• Lower limit: Unconformity (Nukanai Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: east of Makubetsu terrace, Tokachi plain, Hokkaido

• Takashimizu and Oka (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.65-79 DOI