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
Mammalia
 Multituberculata - Cimolomyidae
Essonodon browni Simpson 1927 multituberculate
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
 Multituberculata - Neoplagiaulacidae
Mesodma thompsoni Clemens 1964 multituberculate
 Theriamorpha - Stagodontidae
Didelphodon vorax Marsh 1889 metatherian
 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."