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Sadowara Formation
Invalid synonym: Sadowara Member of Hojogawa Formation
- Boundary between Philippine sea plate and Eurasian plate
- Fore-arc basin sediments
- Coherent formation
- middle Pliocene (3.25 - 3.21 Ma, Foraminifera, Calcareous nannofossils; 3.5 - 3.4 Ma, Tephra)
- Sedimentary facies: Marine
- Water temperature: Warm ocean current (Ostracods)
- Lithofacies: Interbedded sandstone and siltstone
- Upper limit: Conformity
- Lower limit: Conformity
- Miyazaki Group (Tsuma - Takanabe area)
- [ Upper ] Hyuganada Group
- ~~~~~~~~~~~~~~
- Takanabe Formation
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- Sadowara Formation
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- Niinazume Formation
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- Uryuno Formation
- ''''''/,,,,,,,
- Honjo Formation
- ''''''/,,,,,,,
- Tsuma Formation
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- Kawabaru Formation
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hioki river, Shintomi city, Koyu county, Miyazaki pref.
- Fossils: Argonauta hians
- Fossils (Foraminifera): Dentoglobigerina altispira altispira, Sphaeroidinellopsis seminulina, Sphaeroidinella dehiscens
- Fossils (Calcareous nannofossils): Discoaster tamalis, Gephyrocapsa spp., Pseudoemiliania lacunosa
- Fossils (Ostracods): Loxoconcha tamakazura, Acanthocytheries munechikai, Bradleya albatrossia
- Fossils (Traces): Phycosiphon isp.
- Tephra: NKUT-1, NKT-2 (3.5 - 3.4 Ma), NKT-13 (3.5 - 3.4 Ma)
- Iwatani et al., (2009) Jour. Geol. Soc. Japan, vol.115, no.10, pp.548-551 DOI