[ Top ] [ Japanese ]
Kuroishizawa Formation Saito, 1951
- Type locality (Lapilli tuff facies): Kuroishi creek, Fujikoto river, Fujisato city, Yamamoto county, Akita prefecture; Koirikawa, Hachimori, Happo city, Yamamoto county, Akita prefecture
- Type locality (Conglomerate and sandstone facies): Sumikawa creek, Okawame river, Odate city, Akita prefecture
- Volcanic rocks
- Miocene
- Correlation: Daijima Formation
- Intruded by: Augite olivine dolerite, Augite olivine basalt
- Sedimentary facies: Marine
- Lithofacies (Upper): Pyroxene andesitic tuff breccia, Lapilli tuff
- Lithofacies (Lower): Basaltic tuff breccia, Lapilli tuff, Tuff
- Lithofacies (Minor): Rhyolite lava, Andesite lava, Dacite lava, Sandstone, Mudstone, Shale, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kuroishi creek, Fujikoto river, Fujisato city, Yamamoto county, Akita pref.; Sekigatai, Ainai, Soma, Hirosaki city, Aomori pref.; Sunakose, Nishimeya city, Nakatsugaru county, Aomori pref.; Ira river, Iwasaki, Fukaura city, Nishitsugaru county, Aomori pref.; Koirikawa, Hachimori, Happo city, Yamamoto county, Akita pref.; Kasuge river, Fujisato city, Yamamoto county, Akita pref.; Sumikawa creek, Okawame river, Odate city, Akita pref.; Iwanome creek - Kamioosawa creek, Takanosu town, Kitaakita city, Akita pref.
- Fossils: Sharks (Carcharodon megalodon), Sponges (Makiyama chitanii), Brachiopods
- Fossils (Shellfishes, Yatsuo-Kadonosawa fauna): Acila sp., Anadara ninohensis, Barbatia sp., Calyptraea sp., Cardium sp., Chlamys akitana, Chlamys cosibensis, Chlamys kaneharai, Clementia papyracea, Conchocela nipponica, Cryptopecten yanagawaensis, Cylichna? sp., Dosinia kaneharai, Dosinia nomurai, Dosinia odosensis, Glycymeris sp., Glycymeris vestitoides, Joannisiella sp., Lucinoma sp., Macoma aomoriensis, Macoma optiva, Ostrea sp., Patinopecten kimurai, Patinopecten kimurai murayamai, Patinopecten yamasakii iwashiensis, Pitar sp., Placopecten akihoensis, Propeamussium tateiwai, Tapes (Siratoria) siratoriensis, Venericardia siogamensis, Venericardia sp.
- Fossils (Bottom: Aniai-type flora, Lower-Upper: Daijima-type flora): Acer cfr. diabolichum, Acer subpictum, Aesculus majus, Alangium aequalifolium, Alnus miojaponica, Alnus usyuensis, Betula cfr. globispica, Betula sp., Carpinus subcordata, Carpinus subyedoensis, Celtis sp., Chamaecyparis sp., Cinnamomum sp., Comptoniphyllum naumanni, Conus sp., Corylus cfr. sieboldiana, Cyclobalanopsis inouei, Diospyros? sp., Fagus antipofi, Glyptostrobus europaeus, Lithocarpus? sp., Magnolia? sp., Marlea aequalifolia, Metasequoia japonica, Metasequoia occidentalis, Myrica (Comptonia) naumanni, Nelumbo endoana, Ostrya cfr. japonica, Picea kanoi, Picea ugoana, Pinus sp., Populus sp., Pterocarya asymmetrosa, Quercus sp., Rosa sp., Salix varians, Sassafras sp., Trapa borealis, Ulmus longifolia, Ulmus takayasui, Ulmus sp., Viburnum tomentosum, Zelkova ungeri
- Ozawa et al. (1983) Geology of the Nakahama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 4p.)
- Ozawa and Hirayama (1970) Geology of the Goshogawara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 25p. (in Japanese with English abstract 3p.)
- Hirayama and Sumi (1963) Takanosu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 7p.)
- Ozawa (1963) Iwadate, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 14p. (in Japanese with English abstract 3p.)
- Ozawa (1962) Hirosaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 5p.)
- Sumi et al. (1962) Dairakozan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 51p. (in Japanese with English abstract 7p.)