Gugyedong Formation

The Gugyedong Formation, also known as the Guyedong Beds, is an Aptian to Albian geologic formation in South Korea. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.

Fossil content
The following fossils have been reported from the formation:
 * Reptiles
 * Ultrasaurus tabriensis- Nomen Dubium
 * Dromaeosauridae indet. (="Koreanosaurus koreanensis")
 * Sauropoda indet.
 * Testudines indet.
 * Flora
 * Pseudofrenelopsis parceramosa