W1 Unit

W₁ Unit

Type locality: Tsudagawa river, Sokawa town, Kishiwada city, Osaka prefecture
Volcanic rocks
Late Cretaceous, Campanian

Lithofacies: Rhyolitic dacite
Lithofacies: Welded tuff

Thickness: ca. 200 - 300 m
Lower limit: Conformity (Sobakawa Conglomerate)

Sennan Rhyolites
[ Upper ]
~~~~~~~~~~~~~~
W₁₀ Unit
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Okanaka Tuff
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W₉ Unit
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W₈ Unit
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Shimoogi Tuff
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W₇ Unit
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Kibitanigawa Tuff
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W₆ Unit
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W₅ Unit
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Okumizuma Tuffaceous Sandstone
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W₄ Unit
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Hata Tuffaceous Sandstone
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W₃ Unit
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W₂ Unit
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Ushitakigawa Rhyolite Lava
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W₁ Unit
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Sobakawa Conglomerate
~~~~~~~~~~~~~~
[ Lower ]

Sennan Group
[ Upper ]
~~~~~~~~~~~~~~
Sennan Rhyolites
~~~~~~~~~~~~~~
Ogawa Andesite
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Sokawa town, Kishiwada city, Osaka pref.; Ono town - Butsunami town, Izumi city, Osaka pref.

Seike et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.12, pp.759-775 DOI
Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)