Johnson Quarry, Iren Dabasu: Middle Campanian - Late/Upper Campanian, China
collected by A. F. Johnson 1922-1928

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Ornithischia
Ornithischia indet. Seeley 1888
Andrews 1932 16 specimens
Reptilia
Hadrosauridae indet. Cope 1869
Andrews 1932 3 individuals
AMNH 6553, 6365, 6366, 6577
    = Bactrosaurus johnsoni n. gen., n. sp. Gilmore 1933
Gilmore 1933
Gilmoreosaurus mongoliensis (Gilmore 1933)
Currie and Eberth 1993
    = Bactrosaurus johnsoni Gilmore 1933
Godefroit et al. 1998
Reptilia - Ornithomimidae
Ornithomimidae indet. Marsh 1890
Andrews 1932 1 specimen
(2 measurements)
    = Ornithomimus asiaticus Gilmore 1933
Gilmore 1933
recombined as Archaeornithomimus asiaticus
Reptilia - Saurischia
Saurischia indet. Seeley 1888
Andrews 1932 2 specimens
Reptilia - Crocodylia
Crocodylia indet. (Owen 1842)
Andrews 1932
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Andrews 1932
"Trionyx-type"
Bivalvia
Pelecypoda indet. Goldfuss 1820
Andrews 1932
synonym of Bivalvia
see common names

Geography
Country:China State/province:Nei Mongol
Coordinates: 43.7° North, 112.2° East (view map)
Paleocoordinates:43.0° North, 100.8° East
Basis of coordinate:based on nearby landmark
Altitude:965 meters
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Middle Campanian - Late/Upper Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
Stratigraphy
Formation:Iren Dabasu
Stratigraphic resolution:bed
Stratigraphy comments: The Iren Dabasu Formation is Middle–Late Campanian according to Xing et al. 2012
Lithology and environment
Primary lithology: not reported
Environment:fluvial-lacustrine indet.
Taphonomy
Modes of preservation:body
Lagerst�tten type:concentrate
Degree of concentration:-bonebed
Size of fossils:macrofossils
Spatial orientation:random
Preservation of anatomical detail:good
Abundance in sediment:abundant
Associated major elements:many
Disassociated major elements:many
Disassociated minor elements:many
Fragmentation:occasional
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:selective quarrying,surface (float),surface (in situ),mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:A. F. Johnson Collection dates:1922-1928
Collection method comments: probably also visited by 1959 Sino-Soviet Paleontological Expedition
Metadata
Also known as:SCDP site 1, site K, AMNH quarry 141, Johnson's Quarry
Database number:48933
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2005-04-04 10:52:33 Last modified:2023-09-12 15:15:39
Access level:the public Released:2005-04-04 10:52:33
Creative Commons license:CC BY
Reference information

Primary reference:
13074.ETE H. F. Osborn. 1922. Discovery of Cretaceous and older Tertiary strata in Mongolia. Science 56(1446):291-293 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

13060ETE R. C. Andrews. 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 [M. Carrano/M. Carrano/M. Carrano]
69232 E. H. Colbert. 2000. Asiatic dinosaur rush. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia 211-234 [M. Carrano/M. Carrano]
13181ETE P. J. Currie and D. A. Eberth. 1993. Palaeontology, sedimentology and palaeoecology of the Iren Dabasu Formation (Upper Cretaceous), Inner Mongolia, People's Republic of China. Cretaceous Research 14:127-144 [M. Carrano/M. Carrano/M. Carrano]
13061ETE C. W. Gilmore. 1933. On the dinosaurian fauna of the Iren Dabasu Formation. Bulletin of the American Museum of Natural History 68(2-3):23-78 [M. Carrano/M. Carrano/M. Carrano]
10471 P. Godefroit, Z.-M. Dong, P. Bultynck, H. Li, and L. Feng. 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 [M. Carrano/M. Carrano/M. Carrano]
59147 A. Prieto-Márquez. 2011. Cranial and appendicular ontogeny of Bactrosaurus johnsoni, a hadrosauroid dinosaur from the Late Cretaceous of northern China. Palaeontology 54(4):773-792 [M. Carrano/M. Carrano/M. Carrano]
14376ETE A. K. Rozhdestvensky. 1977. The study of dinosaurs in Asia. Journal of the Palaeontological Society of India 20:102-119 [M. Carrano/M. Carrano/M. Carrano]
10410 D. A. Russell. 1972. Ostrich dinosaurs from the late Cretaceous of western Canada. Canadian Journal of Earth Sciences 9:375-402 [M. Carrano/M. Carrano/M. Carrano]
14108ETE D. Smith and P. M. Galton. 1990. Osteology of Archaeornithomimus asiaticus (Upper Cretaceous, Iren Dabasu Formation, People's Republic of China). Journal of Vertebrate Paleontology 10(2):255-265 [M. Carrano/M. Carrano/M. Carrano]
61518 D. B. Weishampel and J. B. Weishampel. 1983. Annotated localities of ornithopod dinosaurs: implications to Mesozoic paleobiogeography. The Mosasaur 1:43-87 [M. Carrano/M. Carrano]
51224 H. Xing, Y. -M. He, L. Li and D. Xi. 2012. A review of the study of the stratigraphy, sedimentology, and paleontology of the Iren Dabasu Formation, Inner Mongolia. In W. Dong (ed.), Proceedings of the Thirteenth Annual Meeting of the Chinese Society of Vertebrate Paleontology 1-44 [R. Benson/R. Benson]
58690 S.-C. Xu, H.-L. You, J.-W. Wang, S.-Z. Wang, J. Yi and L. Jia. 2016. A new hadrosauroid dinosaur from the Late Cretaceous of Tianzhen, Shanxi Province, China. Vertebrata PalAsiatica 54(1):67-78 [M. Carrano/M. Carrano]
85787 X. Yao, C. Sullivan, Q. Tan and X. Xu. 2022. New ornithomimosaurian (Dinosauria: Theropoda) pelvis from the Upper Cretaceous Erlian Formation of Nei Mongol, North China . Cretaceous Research 137:105234 [M. Carrano/M. Carrano]