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Older Sand Dune Deposits

Invalid synonym: Kosagawa Sands, Fukura Sands

• Coherent formation
• Coastal sand dune
• Holocene (7.7 - 5.7 ka BP, ¹⁴C)

• Sedimentary facies: Eolian deposit
• Lithofacies: Sands
• Lithofacies (Minor): Peat
• Sedimentary structures: Cross stratification

• Thickness: ca. 12 m
• Upper limit: Unconformity (Younger Sand Dune Deposits, Kisakata Formation)
• Lower limit: Unconformity (Sasaoka Formation, Nishime Formation, Kotaki Mudflow Deposit, Older Fan Deposit, Chokai volcano products)

• Distribution: Deto, Nishime town, Yurihonjo city, Akita pref.; Yokone, Nikaho city, Akita pref.; Kamikitsunemori - Nishinakanosawa, Kisakata town, Nikaho city, Akita pref.; Osagawa - Kosagawa, Kisakata town, Nikaho city, Akita pref.; Mega - Shukumachi, Yuza city, Akumi county, Yamagata pref.
• Fossils (Pollen): Alnus sp., Artemisia sp., family Cicnoriodeae, Corylus sp., family Cyperaceae, Fagus sp., family Granubeae, Lepidobalanus sp., Monolete, family Osmundaceae, Tilina sp., Tricolparate, Tricolpata,

• Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
• Ozawa et al. (1982) Geology of the Kisakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 4p.)