The Jindong Formation () is a

geological formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock expo ...

located in

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...

. It is dated to the

Cenomanian The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age (geology), age of the Late Cretaceous epoch (geology), Epoch or the lowest stage (stratigraphy), stage of the Upper Cretace ...

stage of the

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''cre ...

, between 99.9 ± 0.7 Ma and 96 Ma.

Geological background

The Jindong Formation consists of thick, fine-grained, altered volcaniclastic sediments. Most of these sediments are ash-rich mudstone, siltstone, and very fine sandstone. There are also coarser sandstone, conglomerate, carbonates, and tuff.

Paleontology

The Jindong Formation has yielded numerous of dinosaurs and bird tracks. Ichnofossils including unnamed tracks of sauropods and pterosaurs, the isolated sauropod skin impression not associated with trackways, and the poorly preserved juvenile sauropod trackway with no ichnotaxon assignment have been reported.

References

{{reflist Geologic formations of South Korea Upper Cretaceous Series of Asia Cretaceous South Korea Cenomanian Stage Mudstone formations Siltstone formations Tuff formations Fluvial deposits Lacustrine deposits Ichnofossiliferous formations Paleontology in South Korea

Geological background

Paleontology

See also

References