The Andaikhudag Formation, in older literature referred to as Unduruh Formation or Ondorukhaa Formation, is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.

Fossil content

The following fossils have been reported from the lacustrine shales and secondary sandstones of the formation:

Andaikhudag Formation

Birds

Ambiortus dementjevi - "Vertebrae and forelimb" Holbotia ponomarenkoi

Andaikhudag Formation

Insects

Hymenoptera

Kotujisca kholbotensis

Neoxyelula reducta

Palaeoichneumon townesi

Diptera

Syntemna tele

Ulaia communis

Coleoptera

Allophalerus bontsaganensis

Tetraphalerus notatus

Plecoptera

Accretonemoura radiata

See also

List of dinosaur-bearing rock formations

List of stratigraphic units with few dinosaur genera

Tsagaantsav Formation

References

Bibliography

Geologic formations of Mongolia

Lower Cretaceous Series of Asia

Cretaceous Mongolia

Barremian Stage

Hauterivian Stage

Shale formations

Sandstone formations

Lacustrine deposits

Paleontology in Mongolia

Formations

Andaikhudag Formation