The Chilgog Formation, 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, possibly of sauropods, are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

Description

The formation predominantly consists of sandstone, mudstone and conglomerate, with subordinate tuff and other volcanics. It overlies the Jinju Formation and underlies the Silla Conglomerate, which underlies the Haman Formation, respectively.