The Hupyeongdong Formation ()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 List of dinosaur-bearing rock formations List of stratigraphic units with few dinosaur genera
References