Milk River: Maastrichtian, Canada
collected by G. M. Dawson 1874

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Plastomenus coalescens n. sp. Cope 1875
    = Trionychinae indet.
Gardner et al. 1995
Clastes sp. Cope 1872
Reptilia - Testudines - Trionychidae
    = Trionychidae indet. Gray 1825
Alroy 2006
Reptilia - Testudines
Compsemys ? victa (Leidy 1856)
Reptilia - Testudines - Nanhsiungchelyidae
Compsemys ogmius n. sp. Cope 1875
synonym of Basilemys variolosa
Reptilia - Testudines
Trionyx vagans Cope 1874
    = Trionychoidea indet. Fitzinger 1826
Hay 1908
p. 497: 'Various specimens from Montana, Wyoming, and Canada have been referred to this species; but after careful comparison, the writer has come to the conclusion that it is impossible to identify any of them with Cope's type'
Plastomenus costatus n. sp. Cope 1875
nomen dubium belonging to Pantrionychidae
Reptilia - Hadrosauridae
? Hadrosaurus sp. Leidy 1858
Cionodon stenopsis n. sp. Cope 1875
nomen dubium belonging to Hadrosauridae
see common names

Country:Canada State/province:Alberta
Coordinates: 49.0° North, 110.5° West (view map)
Paleocoordinates:56.5° North, 82.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Maastrichtian
Age range of interval:72.10000 - 66.00000 m.y. ago
Local section:Cypress Hills Local bed:1
Stratigraphic resolution:formation
Stratigraphy comments: "two hundred feet above the beds of cretaceous no. 5"
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Modes of preservation:body
Degree of concentration:dispersed
Size of fossils:macrofossils,mesofossils
Disassociated major elements:some
Disassociated minor elements:some
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:taxonomic analysis
Collectors:G. M. Dawson Collection dates:1874
Database number:58157
Authorizer:M. Carrano, P. Holroyd, J. Alroy, R. Benson Enterer:K. Maguire, P. Holroyd, J. Alroy, R. Benson, M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2006-01-25 12:29:43 Last modified:2017-10-19 14:30:28
Access level:the public Released:2006-01-25 12:29:43
Creative Commons license:CC BY
Reference information

Primary reference:

15647.ETE E. D. Cope. 1875. On the transition beds of the Saskatchewan district. Proceedings of the Academy of Natural Sciences of Philadelphia 27:2-3 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

18120 J. Alroy. 2006. Synonymies and reidentifications of North American fossil vertebrates. [J. Alroy/J. Alroy/J. Alroy]
46759 V. M. Arbour and P. J. Currie. 2013. Euoplocephalus tutus and the diversity of ankylosaurid dinosaurs in the Late Cretaceous of Alberta, Canada, and Montana, USA. PLoS ONE 8(5):e62421:1.-39 [P. Mannion/J. Tennant/M. Carrano]
63647 E. D. Cope. 1875. The Vertebrata of the Cretaceous formations of the west. Report of the United States Geological and Geographical Survey of the Territories 2:1-303 [M. Carrano/M. Carrano/M. Carrano]
743 J. D. Gardner, A. P. Russell, and D. B. Brinkman. 1995. Systematics and taxonomy of soft-shelled turtles (Family Trionychidae) from the Judith River Group (mid-Campanian) of North America. Canadian Journal of Earth Science 32:631-643 [J. Alroy/M. Sommers/D. Nicholson]
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]
17102ETE W. E. Swinton. 1970. The Dinosaurs, Wiley-Interscience, New York 1-331 [M. Carrano/M. Carrano]