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Oarai flora
- Type locality: Oarai city, Higashiibaraki county, Ibaraki prefecture
- Strata: Oarai Formation
- Cretaceous - Paleogene
- [ Produced fossils ]
- Adiantites? oaraiensis
- Adiantites sewardi?
- Andromeda cfr. scripta
- Aporosa nanacarpa
- Aralia disectifolia
- Aralia cfr. taurinensis
- Asplenites sp.
- Betula cfr. maximowicziana
- Brachyphyllum japonicum
- Broussonetia praestans
- Calyptrocalyx spicalus
- Castaliites flabelliformis
- Celastrophyllum sp.
- Cercidiphyllum cfr. eojaponica
- Cinnamomum linifolium
- Coniopteris burejensis
- Corylus? cfr. heterophylla
- Credneria kashimaensis
- Diospyros cfr. anceps
- Doryanthites cretacea
- Equisetum cfr. arcticum
- Equisetum oregonensis
- Ficus? cfr. alaskana
- Ficus antiquorum
- Fraxinus denticulata
- Glyptostrobus cfr. pencilis
- Hedera primordialis
- Hovenia cfr. dulcis
- Ilex? sp.
- Juglans? cfr. orientalis
- MacClintokia sp.
- Magnolia pseudoacuminata?
- Otozamites cfr. sewardi
- Paliurus cfr. upatoiensis
- Paulownia sp.
- Platanus cfr. septentrionalis
- Populus cfr. arctica?
- Populus aff. rotundifolia
- Populus speciofolia
- Quercus sp.
- Sabalites oaraiensis
- Sagus filaris
- Sequoia cfr. jeholensis
- Sphenopteris cfr. yokoyamai
- Sterculia? sp.
- Taxodium cfr. dubium
- Thallites yabei
- Tilia maximowiczianoides
- Tilia cfr. protojaponica
- Ulmus sp.
- Viburnum? cfr. simile
- Zamiophyllum cfr. buchianum
- Zamites megaphyllus
- Zelkova sp.
- Zizyphus cfr. fibrillosus
- Zizyphus pentaxus
- Zizyphus cfr. pseudomeeki
- Sakamoto (1975) Geology of the Isohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
- Sakamoto et al. (1972) Geology of the Nakaminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 5p.)