Toyoma Fm
Period:
Permian
Age Interval:
Upper Permian (Wuchiapingian), (8d)
Province:
South Kitakami Belt-Okago region
Type Locality and Naming
Toyoma(Okago); North Kesennuma; South Kesennuma; Utatsu districts
Synonym:
Lithology and Thickness
Conglomerate, Shale.
[Figure 1: Stratigraphy of the Palaeozoic of the South Kitakatmi Belt, NE Japan (after M. Ehiro et al., 2016)]
Lithology Pattern:
Aus Conglomerate
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Nabekoshiyama Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Okago Fm
Regional extent
Toyoma(Okago); North Kesennuma; South Kesennuma; Utatsu districts
GeoJSON
null
Fossils
The Toyoma and equivalent formations yield Wuchiapingian ammonoids (Murata & Bando 1975; Ehiro & Bando 1985; Ehiro 2010)
Age
Upper Permian (Wuchiapingian)
Age Span:
Beginning stage:
Wuchiapingian
Fraction up in beginning stage:
0.25
Beginning date (Ma):
258.22
Ending stage:
Wuchiapingian
Fraction up in the ending stage:
0.5
Ending date (Ma):
256.89
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.