Yuya Mudstone Member

Yuya Mudstone Member Uchimura et al., 2007

Invalid synonym: upper Oura Member, upper Daiwa? Member

Type locality: Hanao Shrine, Yuya, Koriyama town, Kagoshma city, Kagoshima prefecture
Coherent formation
Pliocene
Intruded by: Nasubida Andesites

Sedimentary facies: Lacustrine
Sedimentary facies: Still water
Lithofacies: Tuffaceous mudstone, Diatomaceous siltstone
Lithofacies (Minor): Sandstone, Conglomerate

Thickness: ca. 20 - 80 m
Upper limit: Conformity (Hanao Tuff Breccia Member)
Lower limit: Transitional (Toge Sandstone Member)

Yuya Mudstone Member
[ Upper ]
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Upper part
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Miyawaki Pyroclastic Flow Deposit
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Middle part
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Kusakidan Pyroclastic Flow Deposit
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Lower part
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[ Lower ]

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

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

Distribution: Yuya - Kannomaru - Sasanodan, Koriyama town, Kagoshima city, Kagoshima pref.; Kusakidan - Daiwa? - Koyoke, Hiwaki town, Satsumasendai city, Kagoshima pref.; Uchinoo, Iriki town, Satsumasendai city, Kagoshima pref.; Raku, Shirao, Gamo town, Aira city, Kagoshima pref.
Fossils (Daiwa? Flora): Metasequoia sp.
Fossils (Diatoms): Stephanodiscus astraea, Stephanodiscus minutulus, Cyclotella michiganiana, Cyclotella comta, Fragilaria construens f. construens, Fragilaria construens f. venter, Fragilaria pinnata ver. pinnata, Aulacoseira ambigua
Tephra: Miyawaki Pyroclastic Flow Deposit, Kusakidan Pyroclastic Flow Deposit

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