Hupyeongdong Formation

Gugyedong Formation
Stratigraphic range: Albian
TypeGeological formation
Unit ofHayang Group
Sub-unitsGumidong Member and Gugyedong Member
UnderliesJeomgog Formation
OverliesIljig Formation
Thickness~500 meters
Lithology
PrimarySandstone, Siltstone and Shale
OtherConglomerate and Tuff
Location
Coordinates36°00′N 128°30′E / 36.0°N 128.5°E / 36.0; 128.5
RegionGyeongsangbuk-do
CountrySouth Korea
ExtentUiseong Subbasin of the Gyeongsang Basin
Type section
Named forHupyeongdong, Uiseong
Named byKim, Lee and Yang, 1977
Hupyeongdong Formation is located in South Korea
Hupyeongdong Formation
Hupyeongdong Formation (South Korea)

The Hupyeongdong Formation (Korean: 후평동층; Hanja: 後坪洞層; RR: Hupyeongdong-cheung)is a Lower Cretaceous geologic formation in South Korea. It is placed inside of the Uiseong Subbasin of the Gyeongsang Basin. The absolute age of the Gugyedong Formation is not resolved, but overlying and underlying stratigraphic units suggest Albian in age.

Geology

Initially, Chang (1975) named the Gumidong formation and the Gugyedong Formation separately, but Kim et al. (1977) united them into the Hupyeongdong Formation, without dividing members.. In subsequent investigations, multiple sheets suggested the Hupyeongdong Formation could be subdivided into the Gumidong Member in the lower and the Gugyedong Member in the upper part.

The Gumidong Member consists of two or three conglomerate beds and interbedded purple mudstone, whereas the Gugyedong Member is composed of purple mudstone and siltstone. From 60 meters above from the base of the member, lenticular channel conglomerate beds composed mostly of lime nodule peebles are present. Based on sedimentary structures including sross-stratification, cross-lamination and current ripple, paleoenviornment of the Hupyeongdong Formation was suggested to be floodplain setting.

Fossil content

Vertebrates of the Hupyeongdong Formation
Genus Species Location Stratigraphic position Material Notes Images
Sauropoda indeterminate Bongam Pass, near Tabri Station Gugyedong Member Humerus and 'cadual neural spine' Includes Ultrasaurus tabriensis(nomen dubium)
Dromaeosauridae indeterminate Bongam Pass, near Tabri Station Gugyedong Member A single femur (DGBU-78) Initially reported as ornithopod
Testudines indeterminate Bongam Pass, near Tabri Station Gugyedong Member Carapaces Undescribed
Plants of the Hupyeongdong Formation
Genus Species Location Stratigraphic position Material Notes Images
Pseudofrenelopsis P. parceramosa Bongam Pass, near Tabri Station Gugyedong Member

See also

References

  1. 1 2 Kim, Bong Gyun; Lee, Yu Dae; Yang, Seung Yeong (August 31, 1977). Explanatory text of the geological map of Euiseong sheet, Scale 1:50,000. Geological and Mineral Institute of Korea. pp. 1–15.
  2. ↑ Lee, Yong Il; Lee, Jae Il; Choi, Yong Seok (March 2023). "Provenance analysis of the Cretaceous Gyeongsang Basin, SE Korea: A synthesis and tectonic implications for active continental margin in East Asia". Earth-Science Reviews. 238 104334. Bibcode:2023ESRv..23804334L. doi:10.1016/j.earscirev.2023.104334.
  3. ↑ Choi, Byung-Do; Wang, Yaqiong (1 April 2025). "Cretaceous non-marine ostracod faunas of South Korea: Synthesis of taxonomy, biostratigraphy and paleoecology". Cretaceous Research. 168 106070. Bibcode:2025CrRes.16806070C. doi:10.1016/j.cretres.2024.106070.
  4. ↑ Chae, Yong-Un; Choi, Taejin; Paik, In Sung; Kim, Jong-Sun; Kim, Hyun Joo; Jeong, Hoon Young; Lim, Hyoun Soo (28 February 2021). "Detrital zircon U-Pb ages of the Cretaceous Iljik, Jeomgok, and Sagok formations in the Cheongsong Global Geopark, Korea: Depositional age and Provenance". Journal of the Korean Earth Science Society. 42 (1): 11–38. doi:10.5467/JKESS.2021.42.1.11.
  5. 1 2 Chang, Ki Hong; Koh, In Seok; Park, Hee In; Chi, Jeong Mahn; Kim, Hang Mook (November 1978). Explanatory text of the geological map of Cheonji sheet, Scale 1:50,000. Korea Research Institute of Geoscience and Mineral Resources. pp. 1–20.
  6. 1 2 Chang, Gi Hong; Lee, Yun Jong; Park, Byung Gueon (September 1981). Explanatory text of the geological map of Gunwi sheet, Scale 1:50,000. Korea Institute of Energy and Resources. pp. 1–20.
  7. ↑ Koh, In Seok; Lee, Yong Tae; Shin, Young Sik (1996). "Paleocurrent Analysis of the Cretaceous Hayang Group in the Northeastern Part of Euiseong Subbasin, Southeast Korea". The Korean Journal of Petroleum Geology. 4 (1): 12–19.
  8. 1 2 3 Kim, Haang-Mook (30 September 1983). "Cretaceous Dinosaurs from Korea". Journal of the Geological Society of Korea. 19 (3): 115–126. Bibcode:1983JGSK...19..115K. doi:10.14770/jgsk.1983.19.3.115.
  9. ↑ Lee, Yuong-Nam; Yang, Seong-Young; Park, Eun-Ju (1997). "Sauropod dinosaur remains from the Gyeongsang Supergroup, Korea". Paleontological Society of Korea Special Publication. 2: 103–114.
  10. ↑ Lee, Yuong-Nam; Yu, Kang-Min; Wood, Craig B (January 2001). "A review of vertebrate faunas from the Gyeongsang Supergroup (Cretaceous) in South Korea". Palaeogeography, Palaeoclimatology, Palaeoecology. 165 (3–4): 357–373. Bibcode:2001PPP...165..357L. doi:10.1016/S0031-0182(00)00171-1.
  11. 1 2 3 Kim, Haang Mook; Gishlick, Alan D.; Tsuihiji, Takanobu (April 2005). "The first non-avian maniraptoran skeletal remains from the Lower Cretaceous of Korea". Cretaceous Research. 26 (2): 299–306. Bibcode:2005CrRes..26..299K. doi:10.1016/j.cretres.2005.01.001.