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Collection: Oguwa Formation, Chikanaga area Kitauwa District, Ehime Prefecture, Japan
| Age | 93.9 - 89.8 Ma (Late/Upper Cretaceous) |
|---|---|
| Interval | Turonian |
| Lat/Long | 33.25,132.75 |
| Location | Chikanaga Formation |
| Mindat.org Region (for given coordinates) | Kitauwa District, Ehime Prefecture, Japan |
| Geographic Scale | local area |
| Geographic Comments | SPECIFIC LOCATION: Near Uwajima, Chikanaga area, Shikoku. Japana. LAT/LONG: estimated based on Fig. 1 of Teraoka et al. 1980. |
| Formation | Oguwa |
| Stratigraphic Scale | formation |
| Straigraphic Comments | STRATIGRAPHIC RELATIONS: From the Oguwa Fm (Turonian) of the lower Shimanto Group and Shimanto Supergroup, overlying the Shimoono Fm (Middle and Upper Albian) and overlain by the Furushiroyama Fm (Coniacian). AGE: Turonian. STRATIGRAPHIC POSITION: List not specified to any part of the formation. |
| Lithology Description | SPECIFIC LITHOLOGY: Lithology, unknown, presumably siliciclastic. LITHIFICATION: No evidence for lithification. |
| Lithology | "siliciclastic" |
| Environment | offshore |
| Geology Comments | STRATIGRAPHY and STRUCTURE: The Shimanto Supergroup is a thick clastic sequence with minor basic volcanic rocks, chert and limestone. The Aptian, Albian, Turonian, and Conacian to Santonian strata are in fault contact with one another. The Lower Cretaceous, except for the Lower Aptian is regarded as rather deep offshore deposits, while the Upper Cretaceous as neritic, shelf deposits. |
Associated Collections
| Collection | Formation | Member | Lithology | Age |
|---|---|---|---|---|
| Yorimatsu Formation, Chikanaga area | Yorimatsu | "siliciclastic" | 86.3 - 83.6 Ma (Late/Upper Cretaceous) | |
| Furushiroyama Formation, Chikanaga area | Furushiroyama | "siliciclastic" | 89.8 - 86.3 Ma (Late/Upper Cretaceous) | |
| Ishibiki Formation, Chikanaga area | Ishibiki | "siliciclastic" | 89.8 - 86.3 Ma (Late/Upper Cretaceous) | |
| Shimoono Formation, Chikanaga area | Kitanada | "siliciclastic" | 109 - 99.6 Ma (Cretaceous) | |
| Chikanaga Formation, Chikanaga area | Chikanaga | "siliciclastic" | 125.45 - 122.46 Ma (Early/Lower Cretaceous) |
Recorded Fossils
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
