Chilgog Formation
Geologic formation in South Korea
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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.[2] Dinosaur remains from this formation[3] are actually from the Iljig Formation, which correlates with the lower part of the Chilgog Formation.[4][5]
| 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 | 36.0°N 128.5°E |
| Approximate paleocoordinates | 40.9°N 128.3°E |
| Region | Gyeongsangbuk-do |
| Country | South Korea |
| Extent | Gyeongsang Basin |
| Type section | |
| Named for | Chilgok |
| Named by | Tateiwa, 1929[1] |
 Chilgog Formation (South Korea) | |
Description
The formation predominantly consists of sandstone, mudstone and conglomerate, with subordinate tuff and other volcanics.[6] It overlies the Jinju Formation and underlies the Silla Conglomerate, which underlies the Haman Formation, respectively.