Mitarai Formation

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Mitarai Formation

Coherent formation
Early Cretaceous, Berriasian
Intruded by: Aplite, Granite porphyry

Sedimentary facies: Marine
Lithofacies (Upper): Interbedded sandstone and shale
Lithofacies (Lower): Conglomerate

Thickness (Upper): ca. 200 m
Thickness (Lower): several m
Upper limit: Unconformity (Stage I, Hikodani Welded Tuff)
Lower limit: Unconformity (Mugishima Granite)

Tetori Group (Shokawa, Gife pref.)
[ Upper ]
~~~~~~~~~~~~~~
Otaniyama Formation
Mitarai Formation
~~~~~~~~~~~~~~
[ Lower ]

(Invalid name) Shogawa Formation
[ Upper ]
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(Invalid name) Mitarai Shale
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(Invalid name) Nonomata Alternation
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(Invalid name) Sandani Conglomerate
~~~~~~~~~~~~~~
[ Lower ]

Kuzuryu Group (Takayama, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
(Invalid name) Shogawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Nonomata, Shokawa town, Takayama city, Gifu pref.; Shinkaruokatoge pass - Karuokatoge pass - Mumaya - Mumaya river, Takayama city, Gifu pref.
Fossils: Belemnites (Cylindoroteuthis aff. knoxvillensis Anderson), Ammonoids (Delphinella cf. obtusenodosa, Berriasella sp.), Bivalves (Inoceramus maedae)

Sano et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.2, pp.71-79 DOI
Kawada (1982) Geology of the Mikkamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 6p.)