Itukamati Sandstone Member

Itukamati Sandstone Member (Otuka, 1934) Tuzino et al., 2018

Invalid synonym: Itukamati Muddy Sands, Itsukamachi Sandstone, Muramatsu Tuff Member, Shinden? Sandstone Member (Northern facies), Tsukidate Sandstone (Southern facies)

Type locality: Iwaya bridge, Shiratori river, Itsukamachi, Fukuoka, Ninohe city, Iwate prefecture
Type locality (Sub): Oho cliff, Basen valley, Ninohe city, Iwate prefecture
Coherent formation
middle Miocene (16.0 - 14.6 Ma, Diatoms; 16.4 - 15.1 Ma, Foraminifera)

Sedimentary facies: Shallow marine
Climate: Warm temperate, Cold temperate
Lithofacies: Tuffaceous sandstone, Sandstone
Lithofacies (Minor): Siltstone

Upper limit: Conformity (Aikawa Volcanic Rock Member), Unconformity (Hinosawa Conglomerate Member, Maisawa Terrace Deposit)
Lower limit: Transitional (Anausi Conglomerate Member), Conformity (Sikonai Siltstone Member)

Suenomatuyama Formation
[ Upper ]
~~~~~~~~~~~~~~
Mainosawa Sandstone Member
--------------
Aikawa Volcanic Rock Member / Nakuidake Volcanic Rock Member
--------------
Itukamati Sandstone Member
--------------
Anausi Conglomerate Member
--------------
[ Lower ]

Shiratorigawa Group
[ Upper ]
~~~~~~~~~~~~~~
Suenomatuyama Formation
--------------
Kadonosawa Formation
--------------
Yotsuyaku Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Iwaya bridge, Shiratori river, Itsukamachi, Fukuoka, Ninohe city, Iwate pref.; Oho cliff, Basen valley, Ninohe city, Iwate pref.; Mabechi river, Mega - Nakasato, Ichinohe city, Ninohe county, Iwate pref.
Fossils: Paleoparadoxia sp. (first description was Desmostylus sp.)
Fossils (Kadonosawa fauna): Shellfishes
Fossils (Trace fossils): Rosselia isp.

Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)