Protosuchus holotype, Dinosaur Canyon, NE of Cameron (Jurassic of the United States)

Where: Coconino County, Arizona (36.0° N, 111.3° W: paleocoordinates 16.0° N, 51.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Dinosaur Canyon Member (Moenave Formation), Hettangian (201.3 - 199.3 Ma)

• Most of the Moenave Formation is the Dinosaur Canyon Member. In the Moenave type section, near Tuba City, Arizona, all of the Moenave section is Dinosaur Canyon Member, as it is throughout the Moenave outcrop belt along the Echo Cliffs and Ward's Terrace of northern Arizona. However, north of the Grand Canyon in Arizona and in southwestern Utah, the upper part of the Moenave Formation is lacustrine strata. These strata are the Whitmore Point Member.

•Lucas et al. (2011: Palaeo3 302: 194-205) proposed, on the basis of multiple lines of biostratigraphic evidence, that the Triassic–Jurassic boundary is placed within the middle part of the Whitmore Point Member of the Moenave Formation where this member is present, and high in the Dinosaur Canyon Member elsewhere. The "Whitmore Point assemblage" of vertebrate taxa, earliest Jurassic (Hettangian) in age. The underlying "Dinosaur Canyon assemblage", is latest Triassic (Rhaetian) in age. This locality is within the earliest Jurassic part of the formation.

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; red sandstone

Size class: macrofossils

Collected by Brown, Bird, Welles, Colbert in 1931-1949; reposited in the AMNH, UCMP

Collection methods: quarrying, mechanical,

Primary reference: E. H. Colbert and C. C. Mook. 1951. The ancestral crocodilian Protosuchus. Bulletin of the American Museum of Natural History 97(3):143-182 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 137231: authorized by Richard Butler, entered by Richard Butler on 13.12.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Loricata - Protosuchidae
"Archaeosuchus richardsoni n. gen. n. sp." = Protosuchus richardsoni
"Archaeosuchus richardsoni n. gen. n. sp." = Protosuchus richardsoni Brown 1933 crocodilian
AMNH 3024 (holotype), articulated skeleton. AMNH 3025, 3026, 3027, 3028, 3056, UCMP 36717