Yoshiki Fm
Type Locality and Naming
Fukuji—Takayama area (b) is the type locality of this belt (Tsukada et al., 2004).
Synonym:
Lithology and Thickness
Felsic tuffaceous rocks
[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)]
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Hitoegane Fm
Upper contact
The Yoshiki Fm is largely in fault contact with the surrounding geological units, although it is partly overlain by the Fukuji Fm (Igo 1990)
Regional extent
Hida Gaien Belt- Fukuji-Takayama area (b). The Yoshiki Fm yielding uppermost Silurian radiolarians and coeval zircons with SHRIMP concordant ages of c. 420 Ma (Kurihara 2007; Manchuk et al., 2013a), can be regarded as an equivalent of the Upper Member of the Hitoegane Fm based on its lithological and paleontological similarities (Manchuk et al., 2013b).
GeoJSON
Fossils
Yields uppermost Silurian radiolarians and coeval zircons with SHRIMP concordant ages of c. 420 Ma (Kurihara 2007; Manchuk et al., 2013a).
Age
Depositional setting
Additional Information