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Ogasa Group
Invalid synonym: Ogasayama Gravel
- Type locality: Ogasayama hills, Kakegawa city - Fukuroi city, Shizuoka prefecture
- Coherent formation
- early - middle Pleistocene
- Correlation (Upper): Oshika Gravel Bed
- Correlation (Lower): Kunozan Gravel Bed
- Sedimentary facies: Marine
- Sedimentary facies (Minor): Freshwater
- Sedimentary facies: Submarine fan delta
- Sedimentary facies (Lower): Submarine channel-fill deposit
- Lithofacies: Gravels
- Lithofacies (Minor): Sands, Silt, Silt (Freshwater)
- Sedimentary structures: Cross stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ogasayama hills, Kakegawa city - Fukuroi city, Shizuoka pref.; Nobe, Iwata city, Shizuoka pref.
- Fossils (Shellfishes): Corbicula sp., Cristaria plicatus spatiosa, Hyriopsis schlegeri, Lymnium douglasiae nipponense
- Fossils (Plants): Alnus japonica, Carex sp., Euryalus sp., Hamamelis sp., Humulus japonicus, Mallotus sp., Paliurus sp., Pinus thunbergii, Sapium microcarpa, Sapium sebiferum, Scirpus sp., Styrax japonica (Seeds), Trapa macropoda (Seeds), Viscum sp., Wistaria floribunda
- Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
- Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)
- Makiyama and Sakamoto (1957) Mitsuke & Kakezuka, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 7p.)
- Saito and Isomi (1954) Akihasan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 34p. (in Japanese with English abstract 10p.)