Kuruma Fm
Period:
Jurassic
Age Interval:
Aalenian, (19a)
Province:
Hida Gaien Belt-Shiroumadake area
Type Locality and Naming
Synonym:
Lithology and Thickness
The oldest basin sediments are present in the Kuruma Formation
[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:
Gneiss
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Shiroumadake Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Kuzuryu Subgroup Fm
Regional extent
GeoJSON
null
Fossils
Age
Middle Jurassic (Aalenian)
Age Span:
Beginning stage:
Aalenian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
174.70
Ending stage:
Valanginian
Fraction up in the ending stage:
1.0
Ending date (Ma):
132.60
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.