Duho Formation
| Duho Formation | |
|---|---|
| Stratigraphic range: Middle Miocene ~ | |
| Type | Geological formation |
| Unit of | Yeonil Group |
| Underlies | Alluvium |
| Overlies | Hagjeon Formation |
| Thickness | 150–250 m (490–820 ft) |
| Lithology | |
| Primary | Mudstone |
| Other | Sandstone, Shale |
| Location | |
| Coordinates | 36°00′N 129°12′E / 36.0°N 129.2°E |
| Region | North Gyeongsang Province |
| Country | South Korea |
| Extent | Pohang Basin (ko:포항 분지) |
| Type section | |
| Named for | Duho-dong |
| Named by | Um et al., 1964 |
Geological map and stratigraphy of the Pohang Basin | |
The Duho Formation (Korean: 두호층; Hanja: 斗湖層; RR: Duho-cheung) is a Middle Miocene geological formation in Pohang, South Korea. This formation is deposited in a deep marine environment and is roughly dated to around 15 to 12 million years ago based on various analyses. It is the uppermost unit of the Yeonil Group of Pohang Basin and mainly composed of yellow-brown to dark gray mudstones.