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Iren Dabasu

FormationIren Dabasu
Age:83.5 - 70.6 Ma
Late/Upper Cretaceous
IntervalMiddle Campanian - Late Campanian
Lithologysandstone, claystone
Number of Collections23
Number of Occurrences104

Recorded Sample Locations

LocationRegionStratigraphic Name
north side of Iren Dabasu lakeSonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SBDE Quarry 95E5Sonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
Johnson QuarrySonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
AMNH quarry 149Dornogovi Province, MongoliaIren Dabasu
AMNH quarry 135Dornogovi Province, MongoliaIren Dabasu
SCDP site 7Erenhot City (Erlianhaote Co.), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SCDP site 4Sonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SCDP site 10Erenhot City (Erlianhaote Co.), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SCDP site 9Erenhot City (Erlianhaote Co.), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SCDP site 2Erenhot City (Erlianhaote Co.), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
AMNH quarry 148Sonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SanhangobiSonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
SaihangaobiSonid Right Banner (Sunite Youqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
Subeng Unit 1Sonid Right Banner (Sunite Youqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu
microvertebrate localitySonid Left Banner (Sunite Zuoqi), Xilingol League (Xilinguole Prefecture), Inner Mongolia, ChinaIren Dabasu

Associated Units

Stratigraphic NameAgeLithologyOccurrence Records
Nomogen55.8 - 48.6 Ma
Eocene
mudstone/"limestone", conglomerate, mudstone/claystone, sandstone/claystone, siltstone, mudstone97
Nomogen - Bayan Ulan Beds58.7 - 55.8 Ma
Paleogene
conglomerate55

Recorded Fossils

Accepted NameHierarchyAge
Liliacidites variegatus
species
7Plantae : Tracheophyta : Liliopsida : Liliales : Liliacidites : Liliacidites variegatus83.5 - 70.6 Ma
Late/Upper Cretaceous
Sparganium sp.
genus
6Plantae : Tracheophyta : Liliopsida : Poales : Typhaceae : Sparganium83.5 - 70.6 Ma
Late/Upper Cretaceous
Aquilapollenites sp.
genus
6Plantae : Magnoliophyta : Aquilapollenites83.5 - 70.6 Ma
Late/Upper Cretaceous
Trudopollis sp.
genus
6Trudopollis83.5 - 70.6 Ma
Late/Upper Cretaceous
Pinuspollenites sp.
genus
6Plantae : Tracheophyta : Pinopsida : Pinales : Pinuspollenites83.5 - 70.6 Ma
Late/Upper Cretaceous
Podocarpidites sp.
genus
6Plantae : Tracheophyta : Pinopsida : Pinales : Podocarpaceae : Podocarpidites83.5 - 70.6 Ma
Late/Upper Cretaceous
Campanulaceae
family
5Plantae : Tracheophyta : Magnoliopsida : Asterales : Campanulaceae83.5 - 70.6 Ma
Late/Upper Cretaceous
Caprifoliaceae
family
5Plantae : Tracheophyta : Magnoliopsida : Dipsacales : Caprifoliaceae83.5 - 70.6 Ma
Late/Upper Cretaceous
Ericaceae
family
5Plantae : Tracheophyta : Magnoliopsida : Ericales : Ericaceae83.5 - 70.6 Ma
Late/Upper Cretaceous
Platycarya sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Fagales : Juglandaceae : Platycarya83.5 - 70.6 Ma
Late/Upper Cretaceous
Basopollis sp.
genus
6Plantae : Spermatophyta : Magnoliopsida : Basopollis83.5 - 70.6 Ma
Late/Upper Cretaceous
Tricolpites sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Tricolpites83.5 - 70.6 Ma
Late/Upper Cretaceous
Ulmoideipites sp.
genus
6Plantae : Spermatophyta : Magnoliopsida : Ulmoideipites83.5 - 70.6 Ma
Late/Upper Cretaceous
Proteacidites sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Proteales : Proteacidites83.5 - 70.6 Ma
Late/Upper Cretaceous
Triatriopollenites sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Proteales : Triatriopollenites83.5 - 70.6 Ma
Late/Upper Cretaceous
Menispermaceae
family
5Plantae : Tracheophyta : Magnoliopsida : Ranunculales : Menispermaceae83.5 - 70.6 Ma
Late/Upper Cretaceous
Anacolosidites sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Santalales : Anacolosidites83.5 - 70.6 Ma
Late/Upper Cretaceous
Corylopsis sp.
genus
6Plantae : Tracheophyta : Magnoliopsida : Saxifragales : Hamamelidaceae : Corylopsis83.5 - 70.6 Ma
Late/Upper Cretaceous
Hamamelidaceae
family
5Plantae : Tracheophyta : Magnoliopsida : Saxifragales : Hamamelidaceae83.5 - 70.6 Ma
Late/Upper Cretaceous
Hadrosauridae
family
5Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae83.5 - 70.6 Ma
Late/Upper Cretaceous
Ankylosauria
unranked clade
99Animalia : Chordata : Ornithischia : Ankylosauria83.5 - 70.6 Ma
Late/Upper Cretaceous
Bactrosaurus sp.
genus
6Animalia : Chordata : Reptilia : Dinosauria : Bactrosaurus83.5 - 70.6 Ma
Late/Upper Cretaceous
Bactrosaurus johnsoni
species
7Animalia : Chordata : Reptilia : Dinosauria : Bactrosaurus : Bactrosaurus johnsoni83.5 - 70.6 Ma
Late/Upper Cretaceous
Gilmoreosaurus mongoliensis
species
7Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae : Gilmoreosaurus : Gilmoreosaurus mongoliensis83.5 - 70.6 Ma
Late/Upper Cretaceous
Hadrosauroidea
unranked clade
99Animalia : Chordata : Ornithischia : Hadrosauroidea83.5 - 70.6 Ma
Late/Upper Cretaceous
Ornithischia
unranked clade
99Animalia : Chordata : Ornithischia83.5 - 70.6 Ma
Late/Upper Cretaceous
Spheroolithus irenensis
species
7Animalia : Chordata : Ornithischia : Spheroolithidae : Spheroolithus : Spheroolithus irenensis83.5 - 70.6 Ma
Late/Upper Cretaceous
Osteichthyes
unranked clade
99Animalia : Chordata : Osteichthyes83.5 - 70.6 Ma
Late/Upper Cretaceous
Crocodylia
order
4Animalia : Chordata : Reptilia : Crocodylia83.5 - 70.6 Ma
Late/Upper Cretaceous
Dinosauria
order
4Animalia : Chordata : Reptilia : Dinosauria83.5 - 70.6 Ma
Late/Upper Cretaceous
Shamosuchus sp.
genus
6Animalia : Chordata : Reptilia : Crocodylia : Paralligatoridae : Shamosuchus83.5 - 70.6 Ma
Late/Upper Cretaceous
Testudinata
unranked clade
99Animalia : Chordata : Reptilia : Protochelys : Testudinata83.5 - 70.6 Ma
Late/Upper Cretaceous
Testudines
order
4Animalia : Chordata : Reptilia : Testudines83.5 - 70.6 Ma
Late/Upper Cretaceous
Khunnuchelys erinhotensis
species
7Animalia : Chordata : Reptilia : Testudines : Trionychidae : Khunnuchelys : Khunnuchelys erinhotensis83.5 - 70.6 Ma
Late/Upper Cretaceous
Trionychidae
family
5Animalia : Chordata : Reptilia : Testudines : Trionychidae83.5 - 70.6 Ma
Late/Upper Cretaceous
Tyrannosauroidea
superfamily
4.7Animalia : Chordata : Saurischia : Avetheropoda : Chingkankousaurus : Tyrannosauroidea83.5 - 70.6 Ma
Late/Upper Cretaceous
Caenagnathasia sp.
genus
6Animalia : Chordata : Saurischia : Avetheropoda : Caenagnathidae : Caenagnathasia83.5 - 70.6 Ma
Late/Upper Cretaceous
Gigantoraptor erlianensis
species
7Animalia : Chordata : Saurischia : Avetheropoda : Caenagnathidae : Gigantoraptor : Gigantoraptor erlianensis83.5 - 70.6 Ma
Late/Upper Cretaceous
Dromaeosauridae
family
5Animalia : Chordata : Reptilia : Dinosauria : Dromaeosauridae83.5 - 70.6 Ma
Late/Upper Cretaceous
Alectrosaurus olseni
species
7Animalia : Chordata : Reptilia : Dinosauria : Tyrannosauridae : Alectrosaurus : Alectrosaurus olseni83.5 - 70.6 Ma
Late/Upper Cretaceous
Carnosauria
unranked clade
99Animalia : Chordata : Saurischia : Avetheropoda : Carnosauria83.5 - 70.6 Ma
Late/Upper Cretaceous
Archaeornithomimus asiaticus
species
7Animalia : Chordata : Saurischia : Avetheropoda : Ornithomimidae : Archaeornithomimus : Archaeornithomimus asiaticus83.5 - 70.6 Ma
Late/Upper Cretaceous
Ornithomimidae
family
5Animalia : Chordata : Saurischia : Avetheropoda : Ornithomimidae83.5 - 70.6 Ma
Late/Upper Cretaceous
Erliansaurus bellamanus
species
7Animalia : Chordata : Reptilia : Dinosauria : Therizinosauridae : Erliansaurus : Erliansaurus bellamanus83.5 - 70.6 Ma
Late/Upper Cretaceous
Neimongosaurus yangi
species
7Animalia : Chordata : Reptilia : Dinosauria : Therizinosauridae : Neimongosaurus : Neimongosaurus yangi83.5 - 70.6 Ma
Late/Upper Cretaceous
Segnosaurus sp.
genus
6Animalia : Chordata : Reptilia : Dinosauria : Therizinosauridae : Segnosaurus83.5 - 70.6 Ma
Late/Upper Cretaceous
Tyrannosauridae
family
5Animalia : Chordata : Reptilia : Dinosauria : Tyrannosauridae83.5 - 70.6 Ma
Late/Upper Cretaceous
Saurischia
unranked clade
99Animalia : Chordata : Saurischia83.5 - 70.6 Ma
Late/Upper Cretaceous
Sauropoda
unranked clade
99Animalia : Chordata : Saurischia : Sauropoda83.5 - 70.6 Ma
Late/Upper Cretaceous
Sonidosaurus saihangaobiensis
species
7Animalia : Chordata : Reptilia : Dinosauria : Sonidosaurus : Sonidosaurus saihangaobiensis83.5 - 70.6 Ma
Late/Upper Cretaceous
Bivalvia
class
3Animalia : Mollusca : Bivalvia83.5 - 70.6 Ma
Late/Upper Cretaceous
Sphagnumsporites sp.
genus
6Plantae : Bryophyta : Sphagnopsida : Sphagnales : Sphagnaceae : Sphagnumsporites83.5 - 70.6 Ma
Late/Upper Cretaceous
Lycopodiumsporites sp.
genus
6Plantae : Tracheophyta : Lycopodiopsida : Lycopodiales : Lycopodiaceae : Lycopodiumsporites83.5 - 70.6 Ma
Late/Upper Cretaceous
Leptolepidites verrucatus
species
7Plantae : Pteridophyta : Lycopsida : Leptolepidites : Leptolepidites verrucatus83.5 - 70.6 Ma
Late/Upper Cretaceous
Selaginella sp.
genus
6Plantae : Tracheophyta : Lycopodiopsida : Selaginellales : Selaginellaceae : Selaginella83.5 - 70.6 Ma
Late/Upper Cretaceous
Cyathidites australis
species
7Plantae : Tracheophyta : Cyathidites : Cyathidites australis83.5 - 70.6 Ma
Late/Upper Cretaceous
Laevigatosporites sp.
genus
6Plantae : Tracheophyta : Laevigatosporites83.5 - 70.6 Ma
Late/Upper Cretaceous
Leiotriletes sp.
genus
6Plantae : Leiotriletes83.5 - 70.6 Ma
Late/Upper Cretaceous
Osmundacidites sp.
genus
6Plantae : Pteridophyta : Pteridopsida : Osmundacidites83.5 - 70.6 Ma
Late/Upper Cretaceous

References

Van Straelen V. (1925) The microstructure of the dinosaurian egg-shells from the Cretaceous beds of Mongolia, American Museum Novitates 173, 1-4
Andrews R. C. (1932) , The New Conquest of Central Asia: A Narrative of the Explorations of the Central Asiatic Expeditions ni Mongolia and China, 1921-1930. Natural History of Central Asia 1, 1-678
Gilmore C. W. (1933) On the dinosaurian fauna of the Iren Dabasu Formation, Bulletin of the American Museum of Natural History 68 2-3, 23-78
Chow M., Rozhdestvensky A. K. (1960) Exploration in Inner Mongolia: a preliminary account of the 1959 field work of the Sino-Soviet Paleontological Expedition (SSPE), Vertebrata PalAsiatica 4 1, 1-10
Russell D. A. (1972) Ostrich dinosaurs from the late Cretaceous of western Canada, Canadian Journal of Earth Sciences 9, 375-402
Maryanska T. (1977) Ankylosauridae (Dinosauria) from Mongolia, Palaeontologia Polonica 37, 85-151
Perle A. (1977) O pervoy nakhodke Alektrozavra (Tyrannosauridae, Theropoda) iz pozdnego Mela Mongolii [On the first discovery of Alectrosaurus (Tyrannosauridae, Theropoda) in the Late Cretaceous of Mongolia], Shinzhlekh Ukhaany Akademi Geologiin Khureelen 3 3, 104-113
Mader B. J., Bradley R. L. (1989) A redescription and revised diagnosis of the syntypes of the Mongolian tyrannosaur Alectrosaurus olseni, Journal of Vertebrate Paleontology 9 1, 41-55
Brinkman D. B., Nessov L. A., et al (1993) Khunnuchelys gen. nov., a new trionychid (Testudines: Trionychidae) from the Late Cretaceous of Inner Mongolia and Uzbekistan, Canadian Journal of Earth Sciences 30 10-11, 2214-2223
Currie P. J., Eberth D. A. (1993) Palaeontology, sedimentology and palaeoecology of the Iren Dabasu Formation (Upper Cretaceous), Inner Mongolia, People's Republic of China, Cretaceous Research 14, 127-144
Godefroit P., Dong Z.-M., et al (1998) New Bactrosaurus (Dinosauria: Hadrosauroidea) material from Iren Dabasu (Inner Mongolia, P. R. China), Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 68 supplement, 3-70
Zhang X.-H., Xu X., et al (2001) A long-necked therizinosauroid dinosaur from the Upper Cretaceous Iren Dabasu Formation of Nei Mongol, People's Republic of China, Vertebrata PalAsiatica 39 4, 282-290
Xu X., Zhang Z.-H., et al (2002) A new therizinosauroid (Dinosauria, Theropoda) from the Upper Cretaceous Iren Dabasu Formation of Nei Mongol, Vertebrata PalAsiatica 40 3, 228-240
Carr T. D., Williamson T. E. (2005) A reappraisal of tyrannosauroids from Iren Dabasu, Inner Mongolia, People's Republic of China, Journal of Vertebrate Paleontology 25 3, suppl., 42A
Xu X., Zhang X., et al (2006) A new titanosaurian sauropod from Late Cretaceous of Nei Mongol, China, Acta Geologica Sinica 80 1, 20-26
Van Itterbeeck J., Missiaen P., et al (2007) Woodland in a fluvio-lacustrine environment on the dry Mongolian Plateau during the late Paleocene: Evidence from the mammal bearing Subeng section (Inner Mongolia, P.R. China), Palaeogeography, Palaeoclimatology, Palaeoecology 243 1-2, 55-78
Xu X., Tan Q., et al (2007) A gigantic bird-like dinosaur from the Late Cretaceous of China, Nature 447, 844-847
Yao X., Wang X.-L., et al (2015) Caenagnathasia sp. (Theropoda: Oviraptorosauria) from the Iren Dabasu Formation (Upper Cretaceous: Campanian) of Erenhot, Nei Mongol, China, Vertebrata PalAsiatica 53 4, 291-298
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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