Crooked Creek (Montana) (Cretaceous of the United States)

Where: Garfield County, Montana (47.6° N, 107.0° W: paleocoordinates 54.4° N, 80.1° W)

• coordinate based on political unit

When: Hell Creek Formation, Lancian (70.6 - 66.0 Ma)

Environment/lithology: terrestrial

Primary reference: R. E. Sloan and L. Van Valen. 1965. Cretaceous mammals from Montana. Science 148(3667):220-227 [J. Alroy/J. Alroy/J. Alroy]more details

PaleoDB collection 14523: authorized by John Alroy, entered by John Alroy on 21.09.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• originally a Barnum Brown AMNH locality
 Multituberculata - Neoplagiaulacidae
Mesodma thompsoni Clemens 1964 multituberculate
 Multituberculata - Cimolomyidae
Cimolomys gracilis Marsh 1889 multituberculate
presumably includes "Cimolodon nitidus" and definitely includes "Cimolodon sp." of Simpson 1927
Meniscoessus robustus Marsh 1889 multituberculate
includes Simpson's type of "M. borealis"; not clear why Meniscoessus is omitted by Sloan and Van Valen
Essonodon browni Simpson 1927 multituberculate
 Theriamorpha - Pediomyidae
"Pediomys hatcheri" = Protolambda hatcheri, "Pediomys cooki" = Leptalestes cooki
"Pediomys hatcheri" = Protolambda hatcheri Osborn 1898 metatherian
"Pediomys cooki" = Leptalestes cooki Clemens 1966 metatherian
presumably includes additional "Pediomys sp."
 Theriamorpha - Stagodontidae
Didelphodon vorax Marsh 1889 metatherian