Uhangri Formation
Fossil site in Haenam-eup, South Korea
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The Uhangri Formation (Korean: 우항리층; Hanja: 牛項里層; RR: Uhangni-cheung), located at the Haenam, Jeollanam-do, South Korea is a non-marine geological formation known with epiclastic fluvio-lacustrine sequence with minor volcaniclastics.[2] Ichnofossils are found in the upper part of the Uhangri Formation, and they are associated with ripple marks, indicating the part of the formation was the shallow lake margin.[3]
| Uhangri Formation | |
|---|---|
| Stratigraphic range: Campanian[1] | |
| Type | Geological formation |
| Unit of | Haenam Group |
| Underlies | Hwangsan Tuff |
| Overlies | Andesitic Tuff |
| Thickness | 400 meters |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | 34.6°N 126.4°E |
| Approximate paleocoordinates | 38.5°N 115.0°E |
| Region | Haenam, Jeollanam-do |
| Country | South Korea |
| Type section | |
| Named for | Uhangri, Haenam |
  Uhangri Formation (South Korea) | |
Fossil contents
Ichnofossils
Pterosaur, dinosaur, and bird tracks are preserved in situ, nearby the Haenam Uhangri Dinosaur Museum. Unnamed tracks of theropods, sauropods and ornithopods are known from the Uhangri Formation.[4] Star-shaped dinosaur trackway with an unknown trackmaker has been discovered and described. It is unsure whether it represents manus-only trackway made by a sauropod trackmaker during swimming,[5][6] or undertracks made by an ornithopod trackmaker.[7]
| Ichnofossils of the Uhangri Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Description | Images | |
| Haenamichnus[3] | H. uhangriensis | Site P2 | Pes size 350mm, consistent with gigantic azhdarchid pterosaurs. Pad impressions present on pes. | ||
| H. isp. | Site P1, Site P4 and Site P9 | Pes size 200-220mm, consistent with azhdarchid pterosaurs wingspan of 5-6m. Length of the trackway from Site P9 is 7.3 meters long, representing the longest pterosaur trackway. | |||
| Hwangsanipes[8] | H. choughi | Ornithuromorph bird tracks with webbings. | |||
| Uhangrichnus[8] | U. chuni | Ornithuromorph bird tracks without webbings. | |||
| Caririchnium | C. isp. | Ornithopod tracks | |||
| Lithographus[9] | L. hieroglypichus | Arthropod tracks, associated with burrows and a resting trace. Possibly made by Dragonfly nymphs.[10] | |||
Ostracods
Paleoflora
| Plants of the Uhangri Formation[12] | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Description | Images |
| Cupressinoxylon | C. uhangriense | |||
| Taxodioxylon | T. cf. nihongii | |||