Jindong Formation
Geologic formation in Korea
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The Jindong Formation (Korean: 진동층; Hanja: 鎭東層; RR: Jindong-cheung) is a geological formation located in South Korea. It is dated to the Cenomanian-Turonian stages of the Late Cretaceous, between 99.9 ± 0.7 Ma and 93.1 ± 0.3 Ma.[1][2]
| Jindong Formation | |
|---|---|
| Stratigraphic range: Cenomanian-Turonian ~ | |
| |
| Type | Geological formation |
| Unit of | Hayang Group |
| Underlies | Yucheon Group (volcanics) |
| Overlies | Haman Formation |
| Lithology | |
| Primary | Mudstone, siltstone |
| Other | Sandstone, shale |
| Location | |
| Coordinates | 35.4°N 128.4°E |
| Approximate paleocoordinates | 44.7°N 122.9°E |
| Region | Gyeongsangnam-do |
| Country | South Korea |
| Extent | Gyeongsang Basin |
  Jindong Formation (South Korea) | |
Geological background
The Jindong Formation consists of thick, fine-grained, altered volcaniclastic sediments. Most of these sediments are ash-rich mudstone, siltstone, and very fine sandstone. There are also coarser sandstone, conglomerate, carbonates, and tuff. [3]
Paleontology
The Jindong Formation has yielded numerous of dinosaurs and bird tracks.[4][5] Ichnofossils including unnamed tracks of sauropods[6] and pterosaurs,[7] the isolated sauropod skin impression not associated with trackways,[8] and the poorly preserved juvenile sauropod trackway with no ichnotaxon assignment[9] have been reported.
| Ichnofossils of the Jindong Formation[10] | ||||||
|---|---|---|---|---|---|---|
| Ichnogenus | Ichnospecies | Region | Member | Material | Notes | Image |
| Brontopodus[5] | B. isp. | Sauropod tracks | ||||
| Caririchnium[5] | C. isp. | Ornithopod tracks | ||||
| Goseongornipes[5] | G. markjonesi | Bird tracks | ||||
| Gyeongsangornipes[11] | G. lockleyi | Bird tracks | ||||
| Hadrosauropodus | H. kyoungsookimi[12] | The first trackway of a quadrupedal ornithopod discovered in Korea, originally attributed to the ichnogenus Caririchnium.[13] | ||||
| Jindongornipes[5] | J. kimi | Bird tracks | ||||
| Koreanaornis[5] | K. hamanensis | Bird tracks | ||||
| Ornithopodichnus[14] | O. masanensis | Currently regarded as dubious ichnotaxon made by ornithopod trackmakers. | ||||
| cf. Ruopodosaurus[15] | cf. R. isp. | Ankylosaur trackway, possibly made by (sub)adult Ankylosaurid trackmaker | ||||
| Undichna[16] |
|
Fish swim traces | ||||