Chilgog Formation

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 108.7–106.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 / 36.0; 128.5
Approximate paleocoordinates	40.9°N 128.3°E / 40.9; 128.3
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.

See also

• ko:경상 분지 (Gyeongsang Basin)
• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils