[ Top ] [ Japanese ]
Ikarigaseki Formation Inoue and Mitsuhashi, 1962
- Type locality: Komakisawa, Nagamine, Owani city, Minamitsugaru county, Aomori prefecture
- Caldera lake deposit
- Coherent formation
- Pliocene
- Contemporaneous heterotopic facies: Tazawamoriyama Formation
- Sedimentary facies: Lacustrine
- Lithofacies: Siltstone
- Lithofacies (Minor): Sandstone, Tuff
- Lithofacies (Basal): Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Komakisawa, Nagamine, Owani city, Minamitsugaru county, Aomori pref.
- Fossils (Plants): Carpinus sp., Metasequoia sp.
- Fossils (Freshwater diatoms): Stephanodiscus niagarae, Stephanodiscus astraea, Stephanodiscus hantzcshii, Cyclotella kützingiana, Cyclotella striata, Cyclotella ocellata, Epithemia turgida, Melosira granulata, Roicosphenia ourvata, Fragilaria construens, Rhopalodia gibba, Cymbella lanceolata, Diatomella balfouriana, Diploneis smithii, Navicula lanceolata, Synedra vaucheriae
- Tephra: Pyroclastic fall deposit of Ajarayama Andesite
- Muraoka and Hase (1990) Geology of the Kuroishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 124p. (in Japanese with English abstract 8p.)