Hupyeongdong Formation
| Gugyedong Formation | |
|---|---|
| Stratigraphic range: | |
 | |
| Type | Geological formation |
| Unit of | Hayang Group |
| Sub-units | Gumidong Member and Gugyedong Member |
| Underlies | Jeomgog Formation |
| Overlies | Iljig Formation |
| Thickness | ~500 meters |
| Lithology | |
| Primary | Sandstone, Siltstone and Shale |
| Other | Conglomerate and Tuff |
| Location | |
| Coordinates | 36°00′N 128°30′E / 36.0°N 128.5°E |
| Region | Gyeongsangbuk-do |
| Country | South Korea |
| Extent | Uiseong Subbasin of the Gyeongsang Basin |
| Type section | |
| Named for | Hupyeongdong, Uiseong |
| Named by | Kim, Lee and Yang, 1977[1] |
  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.[2] The absolute age of the Gugyedong Formation is not resolved, but overlying and underlying stratigraphic units suggest Albian in age.[3][4]
Geology
[edit]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..[1] 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.[5][6]
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.[5] From 60 meters above from the base of the member, lenticular channel conglomerate beds composed mostly of lime nodule peebles are present.[6] Based on sedimentary structures including sross-stratification, cross-lamination and current ripple, paleoenviornment of the Hupyeongdong Formation was suggested to be floodplain setting.[7]
Fossil content
[edit]| Vertebrates of the Hupyeongdong Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Sauropoda[8][9][10] | indeterminate | Bongam Pass, near Tabri Station | Gugyedong Member | Humerus and 'cadual neural spine'[8] | Includes Ultrasaurus tabriensis(nomen dubium) | |
| Dromaeosauridae[11] | indeterminate | Bongam Pass, near Tabri Station | Gugyedong Member | A single femur (DGBU-78) | Initially reported as ornithopod[8] | |
| Testudines[11] | indeterminate | Bongam Pass, near Tabri Station | Gugyedong Member | Carapaces | Undescribed | |
| Plants of the Hupyeongdong Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Pseudofrenelopsis[11] | P. parceramosa | Bongam Pass, near Tabri Station | Gugyedong Member | |||
See also
[edit]References
[edit]- 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.
- ↑ 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.
- ↑ 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.
- ↑ 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.
- 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.
- 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.
- ↑ 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.
- 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.
- ↑ 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.
- ↑ 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.
- 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.