Jusanhama Gr
Period:
Jurassic, Cretaceous
Age Interval:
Early Cretaceous (Berriasian-Valanginian), (8f)
Province:
South Kitakami Belt-Western Sub-belt
Type Locality and Naming
Shizugawa (Shizukawa)-Hashiura Sub-belt; Hashiura area
Synonym:
Lithology and Thickness
It has been divided into the Tsukihama and overlying Tategarni formations (Takahashi 1961, but see Kase 1979; Takizawa et a1., 1990 for alternative lithostratigraphic divisions).
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Tategami Fm
Upper contact
Regionally, the schematic strat column indicates this is the youngest unit
Regional extent
Shizugawa (Shizukawa)-Hashiura Sub-belt; Hashiura area. The Jusanhama Gr crops out only in the Hashiura area
GeoJSON
null
Fossils
Age
Given its stratigraphic position above the Nagao Formation, the Jusanhama Gr is considered to be Early Cretaceous in age.
Age Span:
Beginning stage:
Berriasian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
143.10
Ending stage:
Albian
Fraction up in the ending stage:
1.0
Ending date (Ma):
100.50
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.