Seven Mile Creek (AMNH): Late/Upper Maastrichtian, Wyoming
collected by B. Brown 1900, 1909

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Ankylosauridae
Dynamosaurus imperiosus Osborn 1905
1 specimen
AMNH 5866, dermal plates, originally part of holotype
    = Ankylosaurus magniventris Brown 1908
Carpenter 2004
Reptilia - Iguanodontidae
Iguanodontidae indet. Bonaparte 1850
Osborn 1906 1 specimen
jaw
Reptilia - Hadrosauridae
Anatosaurus annectens (Marsh 1892)
Lull and Wright 1942 1 specimen
recombined as Edmontosaurus annectens
AMNH 5863
Reptilia - Ceratopsidae
Triceratops sp. Marsh 1889
Osborn 1906 1 specimen
frill
Reptilia - Tyrannosauridae
Dynamosaurus imperiosus n. gen., n. sp. Osborn 1905
1 individual
synonym of Tyrannosaurus rex
AMNH 5866/BMNH R7794; holotype
Reptilia - Baenidae
Thescelus insiliens Hay 1908
Gaffney 1972 1 specimen
AMNH 1108 (Hay, 1908, pls. 24, 25), an almost complete shell
Eubaena latifrons n. sp. Hay 1908
Hay 1908 1 specimen
recombined as Hayemys latifrons
AMNH 6139 (holotype crushed skull)
see common names

Geography
Country:United States State/province:Wyoming County:Niobrara
Coordinates: 43.4° North, 104.4° West (view map)
Paleocoordinates:49.9° North, 79.1° West
Basis of coordinate:stated in text
Altitude:1213 meters
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Late/Upper Maastrichtian
Age range of interval:72.10000 - 66.00000 m.y. ago
Stratigraphy
Formation:Lance
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:fine poorly lithified claystone
Secondary lithology:fine poorly lithified siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "soft, fine-grained claystones and siltstones"
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:good
Articulated whole bodies:some
Associated major elements:some
Disassociated major elements:some
Fragmentation:occasional
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:B. Brown Collection dates:1900, 1909
Collection method comments: 14 x 40 ft quarry
Metadata
Also known as:L&W locality 30, Locality 17
Database number:45878
Authorizer:M. Carrano, R. Benson Enterer:M. Carrano, R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:2004-12-10 08:14:26 Last modified:2022-06-08 16:07:23
Access level:the public Released:2004-12-10 08:14:26
Creative Commons license:CC BY
Reference information

Primary reference:
9259. H. F. Osborn. 1905. Tyrannosaurus and other Cretaceous carnivorous dinosaurs. Bulletin of the American Museum of Natural History 21(14):259-265 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

64040 V. M. Arbour and P. J. Currie. 2016. Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs. Journal of Systematic Palaeontology 14(5):385-444 [G. Lloyd/G. Lloyd/M. Carrano]
71136 V. M. Arbour and J. C. Mallon. 2017. Unusual cranial and postcranial anatomy in the archetypal ankylosaur Ankylosaurus magniventris. Facets 2(2):764-794 [M. Carrano/M. Carrano]
17876ETE B. H. Breithaupt, E. H. Southwell, and N. A. Matthews. 2006. Dynamosaurus imperiosus and the earliest discoveries of Tyrannosaurus rex in Wyoming and the West. In S. G. Lucas and R. M. Sullivan (eds.), Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35:257-258 [M. Carrano/M. Carrano]
11822ETE K. Carpenter. 2004. Redescription of Ankylosaurus magniventris Brown 1908 (Ankylosauridae) from the Upper Cretaceous of the Western Interior of North America. Canadian Journal of Earth Sciences 41:961-986 [M. Carrano/M. Carrano/M. Carrano]
81845 K. L. Derstler. 1994. Dinosaurs of the Lance Formation in eastern Wyoming. In G. E. Nelson (ed.), Wyoming Geological Association Forty-Fourth Annual Field Conference. Wyoming Geological Association Guidebook 44:127-146 [M. Carrano/M. Carrano]
704 E. S. Gaffney. 1972. The systematics of the North American family Baenidae (Reptilia, Cryptodira). Bulletin of the American Museum of Natural History 147(5):245-312 [J. Alroy/M. Sommers/R. Benson]
51846 W. K. Gregory. 1910. The Tyrannosaurus. The American Museum Journal 10:2-8 [M. Carrano/M. Carrano]
14442ETE O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568 [M. Carrano/M. Carrano/M. Carrano]
12319ETE R. S. Lull and N. E. Wright. 1942. Hadrosaurian dinosaurs of North America. Geological Society of America Special Paper 40:1-242 [M. Carrano/M. Carrano/M. Carrano]
17477ETE R. E. Molnar. 1991. The cranial morphology of Tyrannosaurus rex. Palaeontographica Abteilung A 217(4-6):137-176 [M. Carrano/M. Carrano]
17198ETE H. F. Osborn. 1906. Tyrannosaurus, Upper Cretaceous carnivorous dinosaur. (Second communication.). Bulletin of the American Museum of Natural History 22(16):281-296 [M. Carrano/M. Carrano]
12386ETE H. F. Osborn. 1912. Crania of Tyrannosaurus and Allosaurus. Memoirs of the American Museum of Natural History. New Series 1(1):1-30 [M. Carrano/M. Carrano/M. Carrano]
13950ETE J. H. Ostrom. 1965. Cretaceous vertebrate faunas of Wyoming. Wyoming Geological Association Guidebook 19:35-41 [M. Carrano/K. Maguire/M. Carrano]