W6 Unit

W₆ Unit (Yamada et al., 1979)

Volcanic rocks
Late Cretaceous, Campanian
Intruded by: Biotite granodiorite porphyry

Lithofacies: Rhyolite welded tuff
Lithofacies (Minor): Vitreous tuff

Thickness: ca. 150 m
Upper limit: Unconformity (Kibitanigawa Tuff)
Lower limit: Conformity (W₅ Unit)

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

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

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

Distribution: Kibitanigawa river, Kaizuka city, Osaka pref.; Eiraku dam - Mount Ameyama, Kumatori city, Sennan county, Osaka pref.; Mount Kofujisan, Izumisano 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.)