Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Fukata Formation

Fukata Fm

Period:

Silurian

Age Interval:

late Wenlockian-early Ludlovian (Homerian-Ludfordian), (15a)

Province:
Kurosegawa Belt- Shikoku

Type Locality and Naming

Kurosegawa Belt-central Shikoku

Synonym:

Lithology and Thickness

Fukata Fm (Umeda 1993b) is subdivided into a Lower Member, comprising altemating beds of sandstone and mudstone, and mudstone, with calcareous sandstone and conglomerate in its lower and upper parts, and an Upper Member comprising mainly limestone with limestone conglomerate, tuffaceous sandstone and mudstone

[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:

Sandy_claystone

Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Gomi Fm

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Joryu Fm

Regional extent

Kurosegawa Belt-central Shikoku

GeoJSON

null

Fossils

This formation yields late Wenlockian-early Ludlovian corals, trilobites (Hamada 1959c; Kobayashi & Hamada 1985), conodonts (Niko et al., 1989) and radiolarians (Wakamatsu et a1., 1990). The corals are rich in halysitids such as Halysites, Schedohaiysites and

Falsicatenipora, and favositids.

Age

late Wenlockian-early Ludlovian (Homerian-Ludfordian)

Age Span:

Beginning stage:

Homerian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

430.62

Ending stage:

Ludfordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

422.73

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.