Hikoroichi Formation

The strata at Choanji - Shimokogayo, Hikoroichi village, Ofunato city, Iwate pref. was redefined as Choanji Formation by Tazawa and Niikawa (2018).

Type locality: Sakamoto creek - Higuchi creek - Onimaru, Hikoroichi village, Ofunato city, Iwate prefecture
Coherent formation
Carboniferous
Correlation: Mano Formation

Sedimentary facies: Marine

South Kitakami Belt (Ofunato, Iwate pref.)
[ Upper ]
?--?--?--?--?-
Hikoroichi Formation
?--?--?--?--?-
Nagaiwa Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Sakamoto creek - Higuchi creek - Onimaru, Hikoroichi village, Ofunato city, Iwate pref.
Fossils: Rugosa, Brachiopods

Tazawa and Niikawa (2018) Jour. Geol. Soc. Japan, vol.124, no.2, pp.111-116 DOI