Atsuchi Mudstone Member

Atsuchi Mudstone Member Uchimura et al., 2007

Invalid synonym: lower Oura Member, lower Daiwa? Member

Type locality: Atsuchi, Koriyama town, Kagoshima city, Kagoshima prefecture
Coherent formation
Pliocene (2.6 Ma, FT)
Intruded by: Nasubida Andesites

Sedimentary facies: Lacustrine
Lithofacies: Tuffaceous mudstone
Sedimentary structures: Slump structures

Thickness: ca. 60 m
Upper limit: Transitional (Toge Sandstone Member)
Lower limit: Abut unconformity (Kiyoura Andesite)

Koriyama Formation
[ Upper ]
~~~~~~~~~~~~~~
Hanao Tuff Breccia Member
--------------
Yuya Mudstone Member
--------------
Toge Sandstone Member
--------------
Atsuchi Mudstone Member
~~~~~~~~~~~~~~
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Atsuchi - Higashiyukimoto - Oura, Koriyama town, Kagoshima city, Kagoshima pref.; Hiwaki river, Kiyoura, Iriki town, Satsumasendai city, Kagoshima pref.; Ichihino river, Hiwaki town, Satsumasendai city, Kagoshima pref.
Fossils: Fagus sp.
Fossils (Diatoms): Stephanodiscus astraea, Stephanodiscus minutulus

Uchimura et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.95-112 DOI