Muddy Tork (Cretaceous of the United States)

Also known as JHH L6205

Where: Dawson County, Montana (47.1° N, 104.8° W: paleocoordinates 53.5° N, 77.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

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

• from "about 11 m below the K/T boundary" and very high in chron C30n

Environment/lithology: "channel"; sandstone

Primary reference: J. P. Hunter. 1997. Mammals and mollusks across the Cretaceous-Tertiary boundary from Makoshika State Park and vicinity (Williston Basin), Montana. Contributions to Geology, University of Wyoming 32(1):61-114 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14597: authorized by John Alroy, entered by John Alroy on 05.08.1996

Creative Commons license: CC BY (attribution)

Taxonomic list

• NISP 25
Mammalia
 Multituberculata - Cimolomyidae
Meniscoessus robustus Marsh 1889 multituberculate
 Multituberculata - Neoplagiaulacidae
Mesodma sp. Jepsen 1940 multituberculate
Mesodma cf. thompsoni Clemens 1964 multituberculate
 Theriamorpha - Pediomyidae
Pediomyidae indet., ""Pediomys" cf. krejcii" = Leptalestes krejcii, ""Pediomys" hatcheri" = Protolambda hatcheri, ""Pediomys" florencae" = Protolambda florencae
Pediomyidae indet. Simpson 1927 metatherian
either "elegans or 'P.' cooki"
""Pediomys" cf. krejcii" = Leptalestes krejcii Clemens 1966 metatherian
""Pediomys" hatcheri" = Protolambda hatcheri Osborn 1898 metatherian
""Pediomys" florencae" = Protolambda florencae Clemens 1966 metatherian
 Theriamorpha - Stagodontidae
? Didelphodon sp. Marsh 1889 metatherian
Didelphodon vorax Marsh 1889 metatherian
 Theriamorpha - Alphadontidae
Turgidodon rhaister Clemens 1966 metatherian