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Ichinotani Formation

Ichinotani Fm

Period:

Carboniferous

Age Interval:

Mississippian, (Visean), (19b)

Province:
Hida Gaien Belt- Fukuji-Takayama area

Type Locality and Naming

Fukuji—Takayama area (b) is the type locality of this belt (Tsukada et al., 2004).

Synonym:

Lithology and Thickness

Mainly limestone

[Figure 1: Stratigraphic relationship among the rocks of the Hida Gaien Belt (after M. Ehiro et al., 2016)]

[Figure 2: A columnar section of the Muribu and Fukuji successions showing their major lithologies and characteristic layers and blocks (after M. Ehiro et al., 2016)]

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Conformably overlies Fukuji Fm (Tsukada et al., 1999)

Upper contact

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

Regional extent

Hida Gaien Belt- Fukuji-Takayama area (b)

GeoJSON

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Fossils

Has yielded many Visean—Gzhelian fossils such as fusulinoideans and smaller foraminifers

Age

Shown as Carboniferous, hence placed Base of Visean

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

346.73

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.89

Depositional setting

The fossil evidence indicates an origin in a tropical to subtropical environment (lgo 1956; Kate 1959; Igo & Adachi 1981; Adachi 1985). Remarkable red shale layers in this formation suggest that a pale soil formed by chemical weathering of limestone was deposited in a fresh water lake (Igo I960).

Depositional pattern:

Additional Information

Compiler:

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