Judson (Paleocene of the United States)

Also known as L6; L8

Where: Morton County, North Dakota (46.9° N, 101.5° W: paleocoordinates 51.5° N, 79.7° W)

• coordinate based on political unit

When: Tongue River Formation, Tiffanian (61.7 - 56.8 Ma)

Environment/lithology: terrestrial

Primary reference: R. C. Holtzman. 1978. Late Paleocene Mammals of the Tongue River Formation, Western North Dakota. North Dakota Geological Survey Report of Investigations 65:1-88 [J. Alroy/J. Alroy/M. Uhen]more details

PaleoDB collection 14962: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• "four distinct sites"
probably actually in the Slope Fm.: Hartman and Kihm 1991
Gunnell 1994 lists Ptilodus sp. "C"; not clear if this replaces P. wyomingensis
Bivalvia
 Pholadida - Corbulidae
Bicorbula sp. Fischer 1887 clam
Chondrichthyes
 Myliobatiformes - Dasyatidae
Myledaphus sp. Cope 1876 whiptail stingray
 Lamniformes - Odontaspididae
Odontaspis sp. Agassiz 1843 sand tiger shark
Actinopteri
 Acipenseriformes - Acipenseridae
Acipenser sp. Linnaeus 1758 sturgeon
 Teleostei - Aspidorhynchidae
Belonostomus sp.2 Agassiz 1843
 Amiiformes - Amiidae
Amia sp. Linnaeus 1766 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. de Lacep├Ęde 1803 gar
Osteichthyes
 Proteida - Batrachosauroididae
Opisthotriton sp. Auffenberg 1961 salamander
Reptilia
 Testudines -
Testudines indet. Batsch 1788 turtle
"turtles"
Aves
  -
Aves indet. Linnaeus 1758 bird
"birds"
Reptilia
 Loricata -
Crocodylia indet. crocodilian
"two crocodilians"
 Squamata -
Squamata indet. Oppel 1811 lizard
"one or more small lizards"
 Choristodera -
Champsosaurus sp. Cope 1876 choristodere
Mammalia
 Cimolesta - Titanoideidae
Titanoides primaevus Gidley 1917 pantodont
 Cimolesta - Palaeoryctidae
Palaeoryctes cf. punctatus Van Valen 1966 eutherian
 Cimolesta - Pantolestidae
Propalaeosinopa albertensis Simpson 1927 eutherian
 Primates - Plesiadapidae
Plesiadapis cf. churchilli5 Gingerich 1975 primate
 Primates - Carpolestidae
Carpodaptes cf. hobackensis3 Dorr 1952 primate
Carpodaptes cf. hazelae3 Simpson 1936 primate
 Primates - Paromomyidae
Ignacius frugivorus Matthew and Granger 1921 primate
 Placentalia -
Condylarthra indet. Cope 1881 placental
form "2"
 Tribosphenida - Phenacodontidae
Ectocion collinus1 Russell 1929 condylarth
Phenacodus grangeri7 Simpson 1935 condylarth
 Tribosphenida - Nyctitheriidae
Leptacodon ? tener Matthew and Granger 1921 placental
 Ferae - Viverravidae
Protictis paralus n. sp. Holtzman 1978 placental
 Carnivora - Miacidae
Miacidae indet. Cope 1880 carnivoran
Viverravinae indet. Matthew 1909 carnivoran
 Macroscelidea -
Litocherus zygeus4 Gingerich 1983 elephant shrew
 Macroscelidea - Apheliscidae
Dorraletes diminutivus1 Dorr 1952 elephant shrew
 Tribosphenida - Arctocyonidae
Arctocyon sp. Blainville 1841 condylarth
Thryptacodon australis Simpson 1935 condylarth
 Insectivora -
Insectivora indet. insectivoran
form "2"
 Sarcobora - Apatemyidae
Unuchinia dysmathes Holtzman 1978 insectivoran
 Multituberculata - Neoplagiaulacidae
Parectypodus sp. Jepsen 1930 multituberculate
? Ectypodus sp. Matthew and Granger 1921 multituberculate
? Mesodma sp. Jepsen 1940 multituberculate
Neoplagiaulax sp. Lemoine 1882 multituberculate
form "3"
Neoplagiaulax hunteri Simpson 1936 multituberculate
Neoplagiaulax nanophus Holtzman 1978 multituberculate
 Multituberculata - Ptilodontidae
Prochetodon foxi6 Krause 1987 multituberculate
Ptilodus wyomingensis Jepsen 1940 multituberculate