Toyonishi Group
| Toyonishi Group | |
|---|---|
| Stratigraphic range: Tithonian to Lower Hauterivian | |
| Type | Group |
| Sub-units | Kiyosue Formation, Yoshimo Formation |
| Underlies | Toyora Group |
| Overlies | Kanmon Group |
| Thickness | 300–900 metres (980–2,950 ft) |
| Lithology | |
| Primary | Mudstone, Sandstone |
| Other | Siltstone, conglomerate, limestone |
| Location | |
| Region | Shimonoseki City, Yamaguchi |
| Country | Japan |
| Type section | |
| Named for | Toyonishi-son (Village) |
| Named by | Matsumoto, 1949 |
The Toyonishi Group is a group of Mesozoic rock strata in Japan, and was originally named by Tatsuro Matsumoto in 1949. It distributes in the southern half of Shimonoseki City, Yamaguchi Prefecture, southwest Japan, and deposited during the Uppermost Jurassic-Lower Cretaceous along the East Asian continental margin.