[ Top ] [ Japanese ]
Omama Complex (Kamata, 1995) Kamata, 1996
- Type locality (Upper): Takatsudo valley, Takatsudo, Omama town, Midori city, Gunma prefecture
- Type locality (Lower): Oshiyama river, Umeda town, Kiryu city, Gunma prefecture
- Accretionary complex
- Deposition (Limestone): Permian (Fossils)
- Deposition (Siliceous claystone): Early Triassic (Conodonts)
- Deposition (Chert): Permian (Conodonts, Radiolarians), Triassic (Conodonts, Radiolarians), Jurassic (Radiolarians)
- Deposition (Siliceous mudstone): Early Jurassic, Pliensbachian; Middle Jurassic, Bajocian - early Bathonian (Radiolarians)
- Deposition (Mudstone): Middle Jurassic, Bajocian - early Bathonian (Radiolarians)
- Accretion: Middle Jurassic
- Correlation: Funafuseyama Unit
- Sedimentary facies: Marine
- Sedimentary facies (Basalt): MORB, Oceanic island
- Lithofacies (Upper): Mélange facies
- Lithofacies (Lower): Broken facies
- Matrix (Upper): Slate, Mudstone
- Exotic blocks (Upper, Crusts): Limestone, Dolostone, Sandstone, Interbedded sandstone and mudstone, Pelitic mélange, Siliceous claystone, Siliceous mudstone
- Exotic blocks (Lower, Slabs): Basalt lava (Pillow lava), Basalt volcanic rocks, Hyaloclastite, Chert, Mudstone
- Thickness (Northwest side): 10 km or thicker
- Thickness (Southeast side): 2 km or thicker
- Lower limit: Kiryugawa Fault
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Omama town, Midori city, Gunma pref.; Oshiyama river, Umeda town, Kiryu city, Gunma pref.
- Fossils (Limestone): Helicoprion sp., Trilobites, Brachiopods, Corals, Crinoids, Fusulinids, Conodonts
- Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
- Kawata and Ozawa (1955) Ashio, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 7p.)