west of Chaco Canyon, Ojo Alamo (AMNH) (Cretaceous of the United States)

Also known as Willow Wash, Kritosaurus navajovius type

Where: San Juan County, New Mexico (36.3° N, 108.2° W: paleocoordinates 43.5° N, 79.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: De-na-zin Member (Kirtland Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• Called "Ojo Alamo Beds" originally.

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; shale and sandstone

• "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."

Size class: macrofossils

Collected by B. Brown in 1904; reposited in the AMNH

Collection methods: surface (float), surface (in situ), mechanical,

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

Purpose of describing collection: taxonomic analysis

PaleoDB collection 35518: authorized by Matthew Carrano, entered by Matthew Carrano on 19.12.2003, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines - Trionychidae
"Aspideretes austerus n. sp." = Trionyx austerus2, "Aspideretes vorax n. sp." = Trionyx austerus2, "Aspideretes fontanus n. sp." = Trionyx austerus2
"Aspideretes austerus n. sp." = Trionyx austerus2 Hay 1908 softshell turtle
AMNH 6068, holotype partial shell
"Aspideretes vorax n. sp." = Trionyx austerus2 Hay 1908 softshell turtle
AMNH 6140, holotype nuchal bone
"Aspideretes fontanus n. sp." = Trionyx austerus2 Hay 1908 softshell turtle
AMNH 6070, shell fragments
 Testudines - Baenidae
Thescelus rapiens n. sp.2 Hay 1908 turtle
AMNH 6066 (type of T. rapiens Hay, 1908, p. 97, figs. 91, 92), partially damaged shell
 Theropoda -
Theropoda indet.1 theropod
"as large as Albertosaurus"
 Neornithischia - Ceratopsidae
? Monoclonius sp.3 Cope 1876 ceratopsid
AMNH 5798
 Neornithischia - Hadrosauridae
Kritosaurus navajovius n. gen. n. sp.1
Kritosaurus navajovius n. gen. n. sp.1 Brown 1910 hadrosaurine