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Chorakuji Basalt Member (Kobayashi et al., 2008) Shikano et al., 2011
Invalid synonym: Chorakuji Sandstone and Conglomerate
A part of Kamo Lavas and Kuguriiwa Lavas.
- Type locality: Chorakuji temple, Monzen, Honzan, Funagawaminato, Oga city, Akia prefecture
- Volcanic rocks
- Submarine volcano complexes, Scoria cone
- Eocene - Oligocene (33.6 - 26.9 Ma, K-Ar)
- Intruded by: Basaltic andesite dyke, Basaltic agglutinate dyke, Rhyolite
- Sedimentary facies: Marine
- Lithofacies: Alkali olivine basalt - Basaltic trachyte andesite lava, Basalt - Basaltic andesite lava
- Lithofacies (Minor): Volcanic breccia, Volcanic lapilli tuff (Pyroclastic surge deposit), Tuff breccia, Tuffaceous conglomerate (Lahar deposit)
- Lithofacies (North, Upper): aa lava
- Lithofacies (North, Lower): Submarine pahoehoe lava
- Lithofacies (West): Submarine block lava, Scoria, Base-surge deposit, aa lava
- Lithofacies (Basal): Tuffaceous conglomerate, Sandstone, Interbedded sandstone, siltstone and tuffaceous gravel-bearing sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kabuki-iwa, Shioiwa, southern shores of Toga bay - Kamo-Aosa - Monzen, Oga city, Akita pref.
- Fossils: Organic microfossils (Chomotriletes spp.)
- Fossils (Monzen flora): Alnus miojaponica, Betula uzenensis, Carpinus subyedoensis, Corylus sp., Glyptostrobus europaeus, Juglans sp., Metasequoia sp., Picea kanoi, Picea ugoana, Pinus palaeopentaphylla, Tilia sp., Tsuga sp., Ulmus takayasui
- Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
- Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI
- Ohguchi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.17-32 DOI