Comb Ridge, Lewis Quarry (Jurassic to of the United States)

Also known as Locality D1 on Comb Ridge, Lewis tritylodont locality

Where: Navajo County, Arizona (36.8° N, 110.1° W: paleocoordinates 20.3° N, 48.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Kayenta Formation, Sinemurian to Sinemurian (199.3 - 182.7 Ma)

• Outcrop is in the upper part of the Kayenta Formation, 2.5 to 3 m below the base of the overlying Navajo Sandstone. Here the Kayenta is about 44.5 m thick

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; sandstone

• very refractory sandstone

Size classes: macrofossils, mesofossils

Reposited in the AMNH, USNM

Collection methods: bulk, quarrying, surface (in situ), mechanical,

• over 1000kg of rock removed

Primary reference: G. E. Lewis. 1986. Nearctylodon broomi, the first Nearctic Tritylodont. Ecology and Biology of Mammal-like Reptiles 295-303 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 34533: authorized by John Alroy, entered by Erin Leckey on 04.09.2003, edited by Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Loricata -
Crocodylomorpha indet. Hay 1930 crocodilian
Partial skeleton
Osteichthyes
 Therapsida - Tritylodontidae
"Nearctylodon broomi n. gen. n. sp." = Kayentatherium wellesi
"Nearctylodon broomi n. gen. n. sp." = Kayentatherium wellesi Kermack 1982 therapsid
USNM 317201 (holotype), complete skeleton. USNM 317202-317214. Numerus additional specimens are also known