Uhangri Formation

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] 81–79 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 / 34.6; 126.4
Approximate paleocoordinates	38.5°N 115.0°E / 38.5; 115.0
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

Ostracods of the Uhangri Formation[11]
Genus	Species	Presence	Description	Images
Cypridea	C. sp.
Candona	C. sp.
Eucythere	E. sp.

Paleoflora

Plants of the Uhangri Formation[12]
Genus	Species	Presence	Description	Images
Cupressinoxylon	C. uhangriense
Taxodioxylon	T. cf. nihongii

See also

• List of fossil sites