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.Andaikhudag Formation in the Paleobiology Database Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.Weishampel et al., 2004, pp.517-607
Fossil content The following fossils have been reported from the lacustrine shales and secondary sandstones of the formation:
Birds Ambiortus dementjeviKurochkin, 2000 - "Vertebrae and forelimb""Table 11.1," in Weishampel et al., 2004, p.214 Holbotia ponomarenkoiZelenkov & Averianov, 2015
Insects Hymenoptera Kotujisca kholbotensisRasnitsyn, 1991 Neoxyelula reductaRasnitsyn, 1993 Palaeoichneumon townesiKopylov, 2009 Diptera Syntemna teleBlagoderov, 2000 Ulaia communisKalugina, 1993 Coleoptera Allophalerus bontsaganensisPonomarenko, 1997 Tetraphalerus notatus Plecoptera Accretonemoura radiataSinitshenkova, 1987
See also List of dinosaur-bearing rock formations List of stratigraphic units with few dinosaur genera Tsagaantsav Formation
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