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Older Volcanic Fan Deposit

Invalid synonym: Fukasawa Formation

• Coherent formation
• Pleistocene (100 - 80 ka)

• Sedimentary facies: Terrestrial
• Lithofacies: Gravels
• Lithofacies (Minor): Sands, Interbedded sands and mud
• Sedimentary structures: Parallel stratification

• Upper limit: Unconformity (Younger Volcanic Fan Deposit)
• Lower limit: Unconformity (Kanagawayama Debris Avalanche Deposit)

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

• Distribution: 200 - 650 m above sea level of eastern flank of Nekoma volcano, Fukushima pref.
• Fossils (Plants, Fukasawa Formation): Abies sp., Alnus hirsuta, Alnus japonica, Betula cf. maximowicziana, Buxus microphylla, Carex sp., Chamaecyparis pisifera, Hippuris vulgaris, Juglans ailanthifolia, Larix sp., Menyanthes trifoliata, Picea cf. maximowiczii, Rubus sp., Sambucus sp., Sparganium sp., Styrax japonica

• Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)