Kentosan Unit Fm
Period:
Ordovician
Age Interval:
Tremadocian-Floian, (8b)
Province:
South Kitakami Belt- Miyamori-Hayachine-Kamaishi district
Type Locality and Naming
Synonym:
Lithology and Thickness
(Equivalent of the Kagura Unit Fm) of the Hayachine Complex, although their stratigraphic relationship is unclear.
[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (after M. Ehiro et al., 2016)]
Lithology Pattern:
Granitic
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates this is the oldest unit
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Nakadake Serpentinite Fm
GeoJSON
null
Fossils
Age
Shown as Ordovician, hence placed Base of Tremadocian
Age Span:
Beginning stage:
Tremadocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
486.85
Ending stage:
Floian
Fraction up in the ending stage:
1.0
Ending date (Ma):
471.26
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.