Geoncheonri Formation
The Geoncheonri Formation () is an Early Cretaceous (Aptian-Albian) geologic Formation (geology), formation of the Hayang Group in the Gyeongsang Basin of southeast South Korea.Geoncheonri Formation
in the Paleobiology Database Fossil ornithopod tracks,Weishampel et al., 2004, pp.517-607 as well as fossils of ''Kirgizemys'' have been reported from the lacustrine siltstones and mudstones of the formation.

Description

The Geoncheonri Formation (ca. thick) is the uppermost formation of the Hayang Group, belonging to the Gyeongsang Supergroup. The Gyeongsang Supergroup is widely distributed in the southeastern part of the Korean Peninsula, mainly within the Gyeongsang Basin, whi ...
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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 exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ...
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