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Iseyama Formation

• Type locality: Ueda city, Nagano prefecture
• Coherent formation
• middle Miocene (15 - ? Ma)
• Correlation: Bessho Formation

• Sedimentary facies: Marine
• Sedimentary facies (Lower): Continental shelf - Continental slope
• Lithofacies: Mudstone-dominant interbedded sandstone and mudstone, Mudstone

• Upper limit: Unconformity (Older Josho Lake Deposit)
• Lower limit: Conformity (Yokoo Formation)

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

• Distribution: Kangawa river, Motohara, Sanada town, Ueda city, Nagano pref.
• Fossils (Sharks, Teeth): Centroselachus sp., Dalatias licha, Squalus sp., Isurus sp.
• Fossils (Fish scales): Clupeidae, Macrouridae, Trichiuridae, Myctophidae, Sparidae, Sphyraenidae
• Fossisl: Alepisaurus sp., Eosardinella hishinaiensis, Acharax tokunagai, Mizuhobalis izumoensis, Ophiotrichidae
• Fossils (Plants): Flowering plants, Conifers, Brown algae

• Suzuki (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.536-539 DOI
• Suzuki (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.43-46 DOI
• Suzuki (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.23-26 DOI