Chilgog Formation
| Chilgog Formation | |
|---|---|
| Stratigraphic range: Albian | |
| Type | Geological formation |
| Unit of | Hayang Group |
| Underlies | Silla Conglomerate |
| Overlies | Jinju Formation |
| Thickness | Up to 650 m (2,130 ft) 295 m (968 ft) in the western Daegu area |
| Lithology | |
| Primary | Sandstone, mudstone, conglomerate |
| Other | Tuff |
| Location | |
| Coordinates | 36°00′N 128°30′E / 36.0°N 128.5°E |
| Approximate paleocoordinates | 40°54′N 128°18′E / 40.9°N 128.3°E |
| Region | Gyeongsangbuk-do |
| Country | South Korea |
| Extent | Gyeongsang Basin |
| Type section | |
| Named for | Chilgok |
| Named by | Tateiwa, 1929 |
The Chilgog Formation (Korean: 칠곡층; Hanja: 漆谷層; RR: Chilgok-cheung), also known as the Chilgok Formation, is an Early Cretaceous geologic formation in South Korea. Formerly dated to the Berriasian to Hauterivian, later dating has established an Albian age. Dinosaur remains from this formation are actually from the Iljig Formation, which correlates with the lower part of the Chilgog Formation.