Kagura Unit Fm
Period:
Ordovician
Age Interval:
Middle-Late Ordovician (Darriwilian), (8b)
Province:
South Kitakami Belt- Miyamori-Hayachine-Kamaishi district
Type Locality and Naming
Synonym:
Lithology and Thickness
The lower part of the Kagura Unit consists of schistose gabbro, peridotite and small amounts of dolerite, whereas the upper part is composed of a dolerite and trondhjemite sheeted dyke complex sometimes including gabbro.
[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (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 Nakadake Serpentinite Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Koguro Fm
Regional extent
GeoJSON
null
Fossils
Age
Middle-Late Ordovician (Darriwilian)
Age Span:
Beginning stage:
Darriwilian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
469.42
Ending stage:
Darriwilian
Fraction up in the ending stage:
1.0
Ending date (Ma):
458.18
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.