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

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Plastomenus coalescens n. sp. Cope 1875
    = Trionychinae indet.
Gardner et al. 1995
Reptilia - Hadrosauridae
Cionodon stenopsis n. sp. Cope 1875
nomen dubium belonging to Hadrosauridae
? Hadrosaurus sp. Leidy 1858
Reptilia - Testudines
Plastomenus costatus n. sp. Cope 1875
nomen dubium belonging to Pantrionychidae
Reptilia - Testudines - Trionychidae
    = Trionychidae indet. Gray 1825
Alroy 2006
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'
Reptilia - Testudines - Nanhsiungchelyidae
Compsemys ogmius n. sp. Cope 1875
recombined as Basilemys ogmius
Reptilia
Compsemys ? victa (Leidy 1856)
"victus"
Actinopteri - Lepisosteiformes - Lepisosteidae
Clastes sp. Cope 1872
synonym of Lepisosteus
see common names

Geography
Country:Canada State/province:Alberta
Coordinates: 49.0° North, 110.5° West (view map)
Paleocoordinates:56.4° North, 83.4° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
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:Frenchman
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.
Taphonomy
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
Metadata
Database number:58157
Authorizer:M. Carrano, R. Benson, J. Alroy, P. Holroyd Enterer:K. Maguire, R. Benson, M. Carrano, P. Holroyd, J. Alroy
Modifier:P. Mannion Research group:vertebrate
Created:2006-01-25 12:29:43 Last modified:2021-03-01 09:28:50
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]