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Akashi Formation (Shikama, 1936) Ozaki et al., 1995

Invalid synonym: Akashi Group, Miki Formation, Miki Gravels, Ono Formation, Nagaoyama Gravels, Kiyotani Formation, Kiyotani Formation

• Type locality: Akashi seashore, Akashi city, Hyogo prefecture
• Coherent formation
• Pleistocene (0.2 - 0.06 Ma)
• Correlation: Lower Most part, Lower part, Higher Terrace Depsoits

• Sedimentary facies: Fluvial
• Sedimentary facies (Minor): Marine
• Sedimentary facies: Higher Terrace Deposits, Flood plain, Coastal plain
• Sedimentary facies: Fandelta
• Lithofacies: Gravels
• Lithofacies (Minor): Silt, Sandstone
• Sedimentary structures: Imbricate structure, Cross stratification
• Paleocurrent: from North - West, from North - East

• Thickness: several - 300 m or thicker
• Upper limit: Unconformity (Nishiyagi Formation, Meimi Formation)
• Lower limit: Unconformity (Kobe Group)

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

• Distribution: Akashi seashore - Hayashizaki town - Okubo town, Akashi city, Hyogo pref.; Takatsukayama - Kozukayama - Tarumi, Tarumi ward, Kobe city, Hyogo pref.; Mount Shibureyama - Kasamatsutoge pass, Kita ward, Kobe city, Hyogo pref.; Wakimoto town - Ikeda town - Kiyotani, Ono city, Hyogo pref.; Kuranotani - Yashiro town - Ureshino - Kakogawa river, Kato city, Hyogo pref.; Takagi - Kobayashi - Yokawa town, Miki city, Hyogo pref.; Sawadanikaitaku - Kamiuchigami - Okawase - Ueno - Kahsita, Sanda city, Hyogo pref.; Kakogawa city - Ono city - Kasai city, Hyogo pref.
• Fossils: Stegodon Akashiensis
• Fossils: Shellfishes (Siliqua pulchella)
• Fossils (Plants): Abies sp., Acer mono, Broussonetia kazinoki, Callicarpa sp., Carex sp., Carpinus sp., Cornus sp., Ehretia ovalifolia, Fagus microcarpa, Glyptostrobus pensilis, Juglans cinerea var. megacinerea, Magnolia kobus, Melia azedarach, Metasequoia disticha, Picea koribai, Prunus sp., Quercus (Cyclobalanopsis) sp., Quercus (Lepidobalanus) sp., Rubus sp., Torreya sp., Wisteria sp., Zanthoxylum sp., Zelkova sp.
• Tephra: Tamon, Nagasaka, Zenkai, Hasetani, Aoike, Kasugadai, Okubo

• Ozaki and Harayama (2003) Geology of the Takasago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 87p. (in Japanese with English abstract 3p.)
• Ozaki et al. (1995) Geology of the Hojo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 101p. (in Japanese with English abstract 6p.)
• Matsuura et al. (1995) Geology of the Hirone District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 6p.)
• Mizuno et al. (1990) Geology of the Akashi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)
• Ozaki and Matsuura (1988) Geology of the Sanda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
• Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)
• Huzita and Maeda (1984) Geology of the Suma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 101p. (in Japanese with English abstract 7p.)
• Huzita and Kasama (1983) Geology of the Kobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 115p. (in Japanese with English abstract 8p.)