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Kurosawa Formation Murayama, 1937
- Type locality: Kurosawa, Yamauchi, Yokote city, Akita prefecture
- Coherent formation
- Miocene
- Sedimentary facies: Shallow marine (Shellfish fossils)
- Lithofacies: Sandstone
- Lithofacies (Minor): Mudstone, Conglomerate, Acidic tuff
- Lithofacies (Basal): Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kurosawa, Yamauchi, Yokote city, Akita pref.
- Fossils (Shellfishes): Anadara sp., Ancistrolepis mogamiensis, Buccinum ishidai, Buccinum cf. mogamiensis, Cardium iwasiroense, Cerastoderma sp., Chiton gen. et sp. indet, Clementia vatheletii, Clementia cf. yazawaensis, Clinocardium cf. nuttallii, Clinocardium shinjiense, Crepidula sp., Dentalium sp., Dosinia anguloides, Ennucula cf. akitana, Glycymeris sp., Limatula cf. kurodai, Lucina cf. hanezawaensis, Lucinoma acutilineata, Macoma calcarea, Macoma cf. incongrua, Macoma optiva, Macoma tokyoensis, Mactra sp., Mya cuneiformis, Nassarius nakamurai, Natica janthostoma, Natica cf. ovalis, Neptunea cf. modesta, Neptunea nomurai, Neverita cf. didymus, Panomya simotomensis, Papyridea sp., Peronidia protovenulosa, Polynices sp., Portlandia cf. hurukuchiensis, Sanguinolaria cf. uwadokoi, Serripes fujinensis, Serripes notabilis, Serripes yokoyamai, Solen sp., Tellina sp., Thracia hitosaoensis, Thracia kurosawaensis, Thyasira bisectoides, Thyasira nipponica, Trachycardium cf. narasawaense, Turritella cf. fortilirata, Turritella cf. saishuensis
- Ozawa et al. (1971) Geology of the Kawashiri District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 5p.)