Sunset to Dawn Two (UW V-81076) (Cretaceous of the United States)

Where: Washakie County, Wyoming (44.1° N, 107.8° W: paleocoordinates 51.0° N, 75.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Mesaverde Formation, Judithian (83.5 - 70.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: "channel"; poorly lithified, intraclastic, yellow, argillaceous sandstone

• "friable, yellow channel sandstones with occasional stringers of clay galls and clay clasts"

Size class: mesofossils

Collected in 1981; reposited in the UW

Collection methods: bulk, sieve,

Primary reference: J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14487: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• NISP 16 (based on catalog numbers)
Actinopteri
 Ichthyodectiformes - Ichthyodectidae
Xiphactinus vetus2 Leidy 1856
Reptilia
 Squamata - Mosasauridae
Tylosaurinae indet.2 Wiliston 1895 mosasaur
UW 34832
Mammalia
 Multituberculata - Neoplagiaulacidae
Mesodma sp. Jepsen 1940 multituberculate
 Theriamorpha - Alphadontidae
Turgidodon russelli1 Fox 1979 metatherian
Alphadon attaragos n. sp. Lillegraven and McKenna 1986 metatherian
Alphadon halleyi Sahni 1972 metatherian
includes "A. sahnii"
 Theriamorpha -
Protalphadon lulli1 Clemens 1966 metatherian