west of Chaco Canyon, Ojo Alamo (AMNH): Late/Upper Campanian, New Mexico
collected by B. Brown 1904

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Ceratopsidae
Ceratopsia indet. Marsh 1890
Brown 1910 2 specimens
AMNH 5798
    = ? Monoclonius sp. Cope 1876
Lull 1933
Reptilia - Hadrosauridae
Diclonius sp. Cope 1876
1 individual
    = Hadrosauridae indet. Cope 1869
Jesup 1905
"a skull of the Duck-Billed Dinosaur"
    = Kritosaurus navajovius n. gen., n. sp. Brown 1910
Brown 1910
AMNH 5799
Reptilia - Theropoda
Theropoda indet. Marsh 1881
Brown 1910 1 specimen
"as large as Albertosaurus"
Reptilia - Testudines - Trionychidae
Aspideretes austerus n. sp. Hay 1908
Hay 1908 1 specimen
recombined as Trionyx austerus
AMNH 6068, holotype partial shell
Aspideretes vorax n. sp. Hay 1908
Hay 1908 1 specimen
synonym of Trionyx austerus
AMNH 6140, holotype nuchal bone
Aspideretes fontanus n. sp. Hay 1908
Hay 1908 1 specimen
synonym of Trionyx austerus
AMNH 6070, shell fragments
Reptilia - Baenidae
Thescelus rapiens n. sp. Hay 1908
Hay 1908 1 individual
AMNH 6066 (type of T. rapiens Hay, 1908, p. 97, figs. 91, 92), partially damaged shell
see common names

Geography
Country:United States State/province:New Mexico County:San Juan
Coordinates: 36.3° North, 108.2° West (view map)
Paleocoordinates:43.5° North, 79.5° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Late/Upper Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
Stratigraphy
Formation:Kirtland Member:De-na-zin
Stratigraphic resolution:group of beds
Stratigraphy comments: Called "Ojo Alamo Beds" originally.
Lithology and environment
Primary lithology: "shale"
Secondary lithology:"cross stratification" sandstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "conglomerate composed of red, gray, yellow, and white pebbles...Below the conglomerate is a series of shales and sandstones evenly stratified and usually horizontal, in which there is much less cross-bedding than commonly occurs in the Laramie Formation...The shales...I shall designate as the Ojo Alamo Beds...Most of this [fossil] material was chalcedonized."
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Degree of concentration:dispersed
Size of fossils:macrofossils
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:some
Fragmentation:frequent
Collection methods and comments
Collection methods:surface (float),surface (in situ),mechanical,field collection,observed (not collected)
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:B. Brown Collection dates:1904
Metadata
Also known as:Willow Wash, Kritosaurus navajovius type
Database number:35518
Authorizer:M. Carrano, R. Benson Enterer:M. Carrano, R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:2003-12-19 10:46:39 Last modified:2019-02-13 15:43:05
Access level:the public Released:2003-12-19 10:46:39
Creative Commons license:CC BY
Reference information

Primary reference:
63664. Anonymous. 1905. Department of Vertebrate Paleontology. The American Museum Journal 5(1):9-11 [M. Carrano/M. Carrano]

Secondary references:

9596 B. Brown. 1910. The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus Kritosaurus. Bulletin of the American Museum of Natural History 28(24):267-274 [M. Carrano/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]
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]
59350 A. P. Hunt and S. G. Lucas. 1992. Stratigraphy, paleontology and age of the Fruitland and Kirtland formations (Upper Cretaceous), San Juan Basin, New Mexico. In S. G. Lucas, B. S. Kues, T. E. Williamson & A. P. Hunt (eds.), New Mexico Geological Society, 43rd Annual Fall Field Conference, San Juan Basin IV, Guidebook 43:217-239 [M. Carrano/M. Carrano]
53333 M. K. Jesup. 1905. Department of Vertebrate Paleontology. Annual Report of the President, Treasurer's Report, List of Accessions, Act of Incorporation, Contract with the Department of Parks, Constitution, By-Laws and List of Members for the Year 1904 16–19; 54-55 [M. Carrano/M. Carrano]
2212 T. M. Lehman. 1981. The Alamo Wash local fauna: a new look at the old Ojo Alamo fauna. In S. G. Lucas, J. K. Rigby Jr., B. S. Kues (eds.), Advances in San Juan Basin Paleontology. New Mexico University Press, Albuquerque 189-221 [J. Alroy/J. Alroy/M. Carrano]
12314ETE R. S. Lull. 1933. A revision of the Ceratopsia or horned dinosaurs. Memoirs of the Peabody Museum of Natural History 3(3):1-175 [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]
46756 A. Prieto-Marquez. 2013. Skeletal morphology of Kritosaurus navajovius (Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini. Journal of Systematic Palaeontology [P. Mannion/J. Tennant/M. Carrano]
62310 W. J. Sinclair and W. Granger. 1914. Paleocene deposits of the San Juan Basin, New Mexico. Bulletin of the American Museum of Natural History 33(22):297-316 [M. Carrano/M. Carrano]
55658 R. M. Sullivan and S. G. Lucas. 2014. Stratigraphic distribution of hadrosaurids in the Upper Cretaceous Fruitland, Kirtland, and Ojo Alamo formations, San Juan Basin, New Mexico. In D. A. Eberth & D. C. Evans (ed.), Hadrosaurs 361-384 [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]