Ichiyama Fm
Period:
Devonian
Age Interval:
Lochkovian, (19a)
Province:
Kurosegawa Belt- Shikoku
Type Locality and Naming
Kurosegawa Belt-central Shikoku
Synonym:
Lithology and Thickness
Consists of conglomerate, tuffaceous sandstone and mudstone, and acidic tuff.
[Figure 1: Stratigraphy of the Paleozoic of the Kurosegawa Belt in the central part of Shikoku, Southwest 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 Joryu Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Nakahata Fm
Regional extent
Kurosegawa Belt-central Shikoku
GeoJSON
null
Fossils
Radiolarians
Age
Shown as Early Devonian, hence placed Base of Lochkovian
Age Span:
Beginning stage:
Lochkovian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
419.00
Ending stage:
Lochkovian
Fraction up in the ending stage:
1.0
Ending date (Ma):
412.40
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.