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Katsuura Formation Sawada, 1939
- Type locality: Cape Hachiman, Hamakatsuura, Katsuura city - Onjuku city, Isumi county, Chiba prefecture
- Coherent formation
- Fore-arc basin sediments (Kazusa trough)
- Contemporaneous heterotopic facies: Kurotaki Formation
- Sedimentary facies: Abyssal plain, lower Submarine fan, slope base of Submarine fan
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Slump structures
- Paleocurrent: to South-southeast
- Thickness: 120 - 460 m or thicker
- Upper limit: Bottom of the slump structure above Kr1
- Upper limit: Conformity (Namihana Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Hachimn, Hamakatsuura, Katsuura city, Chiba pref.; Onjuku city, Isumi county, Chiba pref.
- Fossils (Shellfishes): Calyptogena sp.
- Fossils (Trace fossils): Chondrites isp., Phycosiphon isp., Planolites isp., Scolicia isp., Zoophycos isp.
- Tephra: IW2, Kr2, IW1, Kr4, KH2, KH1, Kr7, Kr8, MTB, KRu, KRm, TKJ, SW3, SW2, SW1, KW2 (Fup-KW2), KW1, HM
- Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
- Tamura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.23-39 DOI
- GSSP proposal group (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.5-22 DOI
- Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI