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Jindong Formation
Stratigraphic range: Cenomanian ~99.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Hayang Group
Underlies	Yucheon Group (volcanics)
Overlies	Haman Formation
Lithology
Primary	Mudstone, siltstone
Other	Sandstone, shale
Location
Coordinates	35°24′N 128°24′E / 35.4°N 128.4°E / 35.4; 128.4
Approximate paleocoordinates	44°42′N 122°54′E / 44.7°N 122.9°E / 44.7; 122.9
Region	Gyeongsangnam-do
Country	South Korea
Extent	Gyeongsang Basin
Jindong Formation (South Korea)

The Jindong Formation (Korean: 진동층; Hanja: 鎭東層; RR: Jindong-cheung) is a geological formation located in South Korea. It dates to the Cenomanian stage of the Late Cretaceous, with a maximum depositional age of 99.9 ± 0.7 Ma.

Lithology

The formation is a thick layering of fine-grained, altered volcaniclastic sediments. Most of these sediments are ash-rich mudstone, siltstone, and very fine sandstone. There is also coarser sandstone, conglomerate, carbonates, and ash tuff.

Paleontology

The area has many dinosaur and bird tracks, including the dinosaur skin impressions and the poorly preserved juvenile sauropod trackway with no ichnotaxon assignment.

See also

• List of fossil sites

References

1. Lee, Tae-Ho; Park, Kye-Hun; Yi, Keewook (October 2018). "Nature and evolution of the Cretaceous basins in the eastern margin of Eurasia: A case study of the Gyeongsang Basin, SE Korea". Journal of Asian Earth Sciences. 166: 19–31. Bibcode:2018JAESc.166...19L. doi:10.1016/j.jseaes.2018.07.004. S2CID 135061525.
2. Houck, Karen J.; Lockley, Martin G. (February 2006), "Life in an active volcanic arc: Petrology and sedimentology of dinosaur track beds in the Jindong Formation (Cretaceous), Gyeongsang Basin, South Korea" (PDF), Cretaceous Research, 27 (1): 102–122, Bibcode:2006CrRes..27..102H, doi:10.1016/j.cretres.2005.10.004
3. Yoon, H. S.; Lee, Y.-N.; Park, E.; Lee, S. (2024). "A small sauropod trackway from the Upper Cretaceous Jindong Formation (Cenomanian), Goseong County, South Korea". Cretaceous Research. 166. 106022. doi:10.1016/j.cretres.2024.106022.
4. Xing, Lida; Díaz-Martínez, Ignacio; Lallensack, Jens N.; Kim, Kyung Soo; Buckley, Lisa G.; Romilio, Anthony; Piñuela, Laura; Wang, Donghao; Chen, Qiyan; Yang, Qing; Chou, Chunyong; Yin, Hang; Jin, Yufei (2025). "Cretaceous vertebrate tracks". Vertebrate Ichnology: 479–747. doi:10.1016/B978-0-443-13837-9.00002-0.
5. Lockley, Martin G.; Houck, Karen J.; Yang, Seong-Young; Matsukawa, Masaki; Lim, Seong-Kyu (February 2006), "Dinosaur-dominated footprint assemblages from the Cretaceous Jindong Formation, Hallyo Haesang National Park area, Goseong County, South Korea: Evidence and implications" (PDF), Cretaceous Research, 27 (1): 70–101, Bibcode:2006CrRes..27...70L, doi:10.1016/j.cretres.2005.10.010
6. Kim, K.S.; Lockley, M.G.; Romilio, A.; Bae, S.M.; Lim, J.D. (2022). "Fish swim traces from the Jindong Formation (Cretaceous) Korea: Implications for lake basin ichnofacies and paleoecology". Cretaceous Research. 131. 105070. doi:10.1016/j.cretres.2021.105070.
7. Yoon, Han Sang; Lee, Yuong-Nam; Jung, Seung-Ho; Kong, Dal-Yong; Kim, Su-Hwan; Son, Minyoung (2021). "A juvenile ornithopod-dominated tracksite from the Lower Cretaceous Haman Formation, South Korea". Cretaceous Research. 125: 104877. doi:10.1016/j.cretres.2021.104877.
8. Lim, Jong-Deock; Lockley, Martin G.; Kong, Dal-Yong (March 19, 2012), "The Trackway of a Quadrupedal Ornithopod from the Jindong Formation (Cretaceous) of Korea", Ichnos, 19 (1–2), Taylor & Francis Group: 101–104, Bibcode:2012Ichno..19..101L, doi:10.1080/10420940.2012.664059, S2CID 129058417

• 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