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Yamada Formation Baba et al., 2005
- Type locality: Sannotani, Hikida, Akiruno city, Tokyo
- Coherent formation
- end of early Pliocene - beggining of late Pliocene
- Sedimentary facies: Fluvial
- Lithofacies: Breccia, Silt
- Sedimentary structures: Channel structures, Planar cross-stratification, Trough cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sannotani - Ninotani, Hikida, Akiruno city, Tokyo; Ajiro - Yamada, Akiruno city, Tokyo; Kitaasakaw river, Kamiichibukata town, Hachioji city, Tokyo
- Fossils: Stegodon miensis, Stegodon aurorae, Cervidae gen. et sp. indet., Insects, Diatoms
- Fossils (Kamiichibukata fauna): Stegodon aurorae
- Fossils: Choerospondias axillaris, Cunninghamia cfr. lanceolata, Cycrocarya paliurus, Juglans cinerea, Metasequoia disticha (Metasequoia cfr. glyptostroboides), Picea koribai, Sequoia sp., Copals
- Fossils (Pollen): Cunninghamia sp., Glyptostrobus sp., Keteleeria sp., Metasequoia sp., Pseudolarix sp., Sequoia sp.
- Tephra: Sannotani Tephra, Akikawa Lapilli
- Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)