Senmatsu Formation

Senmatsu Formation (Ehiro, 1979) Ehiro and Bando, 1980

Type locality: Senmatsu, Fujisawa town, Ichinoseki city, Iwate prefecture
Coherent formation
Permian
Intruded by: Orikabe-1a type, Tsuyagawa Diorite, Shinchitoge Gabbro, Senmaya Tonalitic Pluton
Correlation: Upper Toyoma Formation

Sedimentary facies: Marine
Lithofacies: Mudstone
Lithofacies (Lower, Minor): Sandstone, Conglomerate

Thickness: ca. 1,500 m
Upper limit: Unconformity (Hiraiso Formation)
Lower limit: Conformity (Okago Formation)

South Kitakami Belt (Fujisawa - Okago)
[ Upper ]
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Senmatsu Formation
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Okago Formation
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Shinden Formation
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Higashifukakaya Formation
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Nishikori Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Senmatsu - Kuriishi pass, Fujisawa town, Ichinoseki city, Iwate pref.; Tsuyagawa - Murone, Ichinoseki city, Iwate pref.; Iriya, Minamisanriku city, Motoyoshi county, Miyagi pref.; Otsunagi - Yonekawa, Towa town, Tome city, Miyagi pref.; Kiridoshi - Yamanishi, Kesennuma city, Miyagi pref.
Fossils: Ammonoids (Cyclolobus cf. walkeri, Medlicottia kitakamiensis, Paratirolites? sp.)
Fossils (Shellfishes): Aviculopecten? onukii, Palaeoneilo ogachiensis, Straparollus (Euompharus) uedai

Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)
Takeuchi and Kaneko (1996) Geology of the Shizugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)