Dushihin Formation

The Dushihin Formation is an Early Cretaceous (Aptian) geologic formation in the Övörkhangai Province of Mongolia.^[1] The formation preserves fossils of Psittacosaurus mongoliensis and fossil eggs described as Trachoolithus faticanus.

Dushihin Formation
Stratigraphic range: Aptian 125–113 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Claystone, conglomerate
Location
Coordinates	45.4°N 101.7°E / 45.4; 101.7
Approximate paleocoordinates	46.5°N 101.7°E / 46.5; 101.7
Region	Övörkhangai Province
Country	Mongolia
Dushihin Formation (Mongolia)

Description

The formation comprises concretionary, calcareous claystones and concretionary, brown, gray, green, blue, calcareous claystones with large flattened lime concretions. Within 3 metres (9.8 ft) in the formation is a lens of lighter grayish-brown clay with green and blue spots and small lime concretions. In the lens is also an inclusion of blue, pale purple-spotted aleurite. The depositional environment has been interpreted as lacustrine.^[2]

Fossil content

The following fossils were reported from the lacustrine claystones and conglomerates of the formation:^[1]

• Dinosaurs
  • Psittacosaurus mongoliensis^[3]
  • Sauropoda indet.^[4]
  • Theropoda indet.^[4]
• Fossil eggs
  • Trachoolithus faticanus^[5]
  • Elongatoolithidae indet.^[6]
  • Spheroolithidae indet.^[6]
• Squamata
  • Paramacellodidae indet.^[4]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with dinosaur eggs
• Andaikhudag Formation
• Khuren Dukh Formation
• Tsagaantsav Formation