[ Top ] [ Japanese ]

Kannonyama Silt Member Toyono Collaborative Research Group, 1977

• Type locality: Mount Kannon, Toyono, Nagano city, Nagano prefecture
• Coherent formation
• Middle Pleistocene

• Sedimentary facies: Lacustrine
• Lithofacies (Upper): Interbedded sands and silt
• Lithofacies (Lower): Silt
• Lithofacies (Minor): Lapilli tuff, Scoriaceous tuff, Volcanic ash

• Thickness: 20 - 30 m
• Upper limit: Conformity (Hiraide Sand and Gravel Member)
• Lower limit: Conformity (Takaoka Sand and Silt Member), Unconformity (Mure Debris Avalanche Deposit)

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

• Distribution: Mount Kannon - Kanisawa - Nakajima - Ishi - Minamigo, Toyono, Nagano city, Nagano pref.; Komaki bridge - Omata - Nagaoka - Takaoka, Nakano city, Nagano pref.
• Fossils: Fishes (family Cyprinidae), Insects (family Carabidae, Wings)
• Fossils (Toyono non-marine fauna): Anodonta (Sinanodonta) lauta, Cipangopaludina chinensis, Cipangopaludina japonica, Corbicula atrata, Corbicula leana, Cristaria cf. plicata, Inversidens japanensis, Semisulcospira (Semisulcospira) reiniana
• Fossils (Plants): Fagus sp., Jagulans sieboldiana (Cones)
• Fossils (Pollen): Abies sp., Alunus sp., Betula sp., Carpinus sp., Fagus sp., Lepidobalanus sp., Ostrya sp., Pinus sp., Pterocarya sp., Quercus sp., Tilia sp., Tsuga sp.

• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)