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Yadagawa Formation (Matsuzawa and Kato, 1954) Nakashima et al., 2021
- Type locality: Lake Aichiike, Nisshin city, Aichi prefecture
- Coherent formation
- Fluvio-lacustrine basin including Lake Tokai
- early - late Pliocene (5.0 - 3.3 Ma)
- Correlation: Mashizume Formation, Tokoname Formation
- Sedimentary facies: Fluvial, Lacustrine
- Sedimentary facies: Flood plain
- Lithofacies (Upper): Gravels, Sands
- Lithofacies (Upper, Minor): Sands, Silt
- Lithofacies (Middle): Silt
- Lithofacies (Middle, Minor): Lignite
- Lithofacies (Upper): Sands, Gravels
- Lithofacies (Upper, Minor): Sands, Silt
- Thickness: ca. 150 - 200 m
- Thickness (Upper): ca. 60 - 80 m
- Thickness (Middle): ca. 30 m
- Thickness (Lower): 70 m or thicker
- Upper limit: Unconformity (Karayama Formation, Yagoto Formation, Kagiya Formation, Kamisue Formation, Shiomisaka Gravel Bed, Miyoshi Formation, Ibohara Formation, Koromo Formation, Hekikai Formation, Koshido Formation, Kagogawa Formation)
- Lower limit: Top of Togo Tephra
- Lower limit: Conformity (Fujioka Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Lake Aichiike, Nisshin city, Aichi pref.; Maigi town - Kamekubi town - Togo town, Toyota city, Aichi pref.; Shinooka - Hayashi, Komaki city, Aichi pref.; Lake Irukaike, Inuyama city, Aichi pref.; Ryusenji - Moriyama - Higashiyama - Idakaryokuchi - Kurosawadai, Nagoya city, Aichi pref.; Mount Daijiyama, Miyoshi town, Miyoshi city, Aichi pref.
- Fossils (Insects): Carabidae
- Fossils (Plants): Ampetopsis brevipedunculata, Brasenia schreberi, Carpinus tschonoskii, Castanea sp., Fagus stuxbergii, Fortinearia sp., Glyptostrobus sp., Liquidambar sp., Metasequoia disticha, Nuphar akashiensis, Pseudolarix sp., Quercus dentata, Quercus serrata, Quercus variabilis, Trapa mammillifera
- Fossils (Pollen): Abies sp., Acer sp., Alnus sp., Alphananthe sp., Araliaceae, Carpinus sp., Castanea sp., Celtis sp., Corylus sp., Ericaceae, Fagus sp., Fraxinus sp., Ilex sp., Juglans sp., Larix sp., Liquidambar sp., Lonicera sp., cf. Metasequoia sp., Nyssa sp., Picea sp., Pinus sp., Pseudotsuga sp., Pterocarya sp., Quercus (Cyclobalanopsis) sp., Quercus (Lepidobalanus) sp., Rhamnaceae, Rhus sp., Salix xp., Sciadopitys sp., cf. Sequoia sp., Styrax sp., Symplocos sp., Taxodiaceae, Tsuga sp., Ulmus sp., Viburnum sp., Vitis sp., Zelkova sp.
- Tephra: Ueno Tephra, Shinooka Tephra, Marune Tephra, Togo Tephra, Nagakute Tephra, Issha Tephra, Kumanomae Tephra, Takinomizu I Tephra, Takinomizu II Tephra, Kutsukake Tephra
- Nakashima et al. (2021) Geology of the Toyota District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 91p. (in Japanese with English abstract 4p.)
- Hatano and Yoshida (2018) Jour. Geol. Soc. Japan, vol.124, no.3, pp.191-205 DOI
- Yoshida et al. (1991) Geology of the Kuwana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 154p. (in Japanese with English abstract 5p.)
- Sakamoto et al. (1986) Geology of the Nagoya-Nambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 3p.)
- Yoshida (1984) Geology of the Yokkaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 5p.)
- Sakamoto et al. (1984) Geology of the Nagoya-Hokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 3p.)