Nameirizawa Fm
Period:
Silurian
Age Interval:
Early Silurian (Rhuddanian), (8b)
Province:
South Kitakami Belt- Miyamori-Hayachine-Kamaishi district
Type Locality and Naming
Synonym:
Lithology and Thickness
It is lithologically similar to the Yakushigawa Fm - consists of mudstone and sandstone in association with tuff and basalt in the lower part.
[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (after M. Ehiro et al., 2016)]
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Yakushigawa Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Odagoe Fm
Regional extent
GeoJSON
null
Fossils
Age
Shown as Early Silurian, hence placed Base of Rhuddanian
Age Span:
Beginning stage:
Rhuddanian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
443.07
Ending stage:
Telychian
Fraction up in the ending stage:
1.0
Ending date (Ma):
432.93
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.