Tsukinoura Fm
Period:
Jurassic
Age Interval:
Early Jurassic (Bajocian), (8j)
Province:
South Kitakami Belt-Central Sub-belt
Type Locality and Naming
the Karakuwa-Oshika Sub-belt; Oshika Peninsula
Synonym:
Lithology and Thickness
It consists of conglomerate and sandstone in the lower part and monotonous mudstone in the upper part.
Lithology Pattern:
Aus conglomerate
Relationships and Distribution
Lower contact
Tsukinoura Fm unconformably overlies the Isatomae Fm. Regionally, the schematic strat column indicates this is the oldest unit.
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Oginohama Fm
Regional extent
GeoJSON
null
Fossils
The lower part yields Bajocian ammonoids (Sate 1972) in association with rich bivalves
(Hayami 1959, 1961a).
Age
Early Jurassic (Bajocian)
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
170.90
Ending stage:
Callovian
Fraction up in the ending stage:
1.0
Ending date (Ma):
161.53
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.