Cenozoic

Cretaceous

Jurassic

Triassic

Permian

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Kanokura Formation

Kanokura Fm

Period:

Permian

Age Interval:

Middle Permian (Roadian-Capitanian), (8c)

Province:
South Kitakami Belt-the Hikoroichi-Setamai district

Type Locality and Naming

Synonym:

Lithology and Thickness

It comprises a lower sequence of conglomeratic sandstone, sandstone and mudstone overlain by muddy limestone and lenticular limestones. The upper part of this formation consists mainly of massive limestone, but changes laterally to calcareous sandstone or mudstone (Ehiro I989. 20l5).

[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (after M. Ehiro et al., 2016)]

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

The Kanokura Fm (the type of the Kanokuran Series) in the Setamai district rests conformably on the Sakamotozawa Fm

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Kowaragi Fm

Regional extent

GeoJSON

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Fossils

Various fossils such as fusulinoideans, corals, brachiopods and molluscs have been reported from the Kanokura Formation (e.g., Minato et al.,1978), allowing Choi (l973) to establish three fusulinoidean zones: the Monodiexodina matsubaishi Zone (lower part, which has also yielded Cancellina), Colania kotsuboensis Zone (uppermost part of the lower) and Lepidolina multiseptata Zone (upper part).

Age

Based on these fusulinoideans, the Kanokura Fm is dated as Roadian-Capitanian

Age Span:

Beginning stage:

Roadian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

274.37

Ending stage:

Capitanian

Fraction up in the ending stage:

1.0

Ending date (Ma):

259.55

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Moreno, T., WALLIS, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 1-24.