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Maedanome Formation Imaizumi, 1949
Invalid synonym: Tachiyama Formation (Tatsuyama Formation), Okamachi Formation, Shinjo Formation
- Type locality: Not defined
- Type locality (Okamachi Formation): Okamachi, Aomori city, Aomori prefecture
- Type locality (Tachiyama Formation): Tachiyama, Kase, Kanagi town, Goshogawara city, Aomori prefecture
- Coherent formation
- middle - late Pleistocene
- Sedimentary facies: Terrestrial
- Sedimentary facies (Bottom): Marine
- Lithofacies: Sands, Tuffaceous sands, Clay, Gravels
- Lithofacies (Minor): Lignite
- Sedimentary structures: Trough cross-stratification, Graded bedding, Wave-formed ripples
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Maedanome, Goshogawara city, Aomori pref.; Daishaka, Namioka, Aomori city, Aomori pref.; Okamachi - Uchimanbe, Aomori city, Aomori pref.; Seheji, Yomogida city, Higashitsugaru county, Aomori pref.; Tachiyama, Kase, Kanagi town, Goshogawara city, Aomori pref.; Nakasato, Nakadomari city, Kitatsugaru county, Aomori pref.; Kanagi town - Iizume, Goshogawara city, Aomori pref.
- Fossils (Insetcs): Plateumaris constricticollis
- Fossils (Bivalves): Macoma (Macoma) cf. incongrua, Corbicula? sp., Potamocorbula? sp.
- Fossils (Trace fossils): Elephants (Footprints), Ophiomorpha isp.
- Tephra: Hakkoda 2nd-stage Pyroclastic Flow Deposit
- Nagamori et al. (2013) Geology of the Aomori-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 67p. (in Japanese with English abstract 4p.)
- Fujii (1981) Geology of the Aburakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 38p. (in Japanese with English abstract 3p.)
- 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.)
- Fujii (1966) Kanagi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 4p.)