Judson (Paleocene of the United States)

Also known as L6; L8

Where: Morton County, North Dakota (46.9° N, 101.5° W: paleocoordinates 52.1° N, 76.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Tongue River Member (Fort Union Formation), Danian (66.0 - 61.6 Ma)

• Peppe et al. 2011: Paleomagnetic analyses of the Tongue River Member document a series of polarity reversals that can be correlated to C29n–C26r of the GPTS suggesting Danian age

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by R. Holtzman in 1977

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

Purpose of describing collection: general faunal/floral analysis

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

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
 Pholadida - Corbulidae
Bicorbula sp. Fischer 1887 clam
 Lamniformes - Odontaspididae
Odontaspis sp. Agassiz 1838 sand tiger shark
 Rajiformes - Rhinobatidae
Myledaphus sp. Cope 1876 guitarfish
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
 Amiiformes - Amiidae
Amia sp. Linnaeus 1766 bowfin
 Aspidorhynchiformes - Aspidorhynchidae
Belonostomus sp.3 Agassiz 1834
 Acipenseriformes - Acipenseridae
Acipenser sp. Linnaeus 1758 sturgeon
 Proteida - Batrachosauroididae
Opisthotriton sp. Auffenberg 1961 salamander
 Choristodera -
Champsosaurus sp. Cope 1876 choristodere
Aves indet. Linnaeus 1758 bird
 Charadriiformes - Graculavidae
Graculavidae indet.2 Fürbringer 1888 shorebird
SMM P77.7.159
 Loricata -
Crocodylia indet. crocodilian
"two crocodilians"
 Testudines -
Testudines indet. Batsch 1788 turtle
 Squamata -
Squamata indet. squamates
"one or more small lizards"
 Squamata - Anguidae
Anguidae indet.4 Gray 1825 squamates
 Multituberculata - Neoplagiaulacidae
Neoplagiaulax sp. Lemoine 1882 multituberculate
form "3"
Neoplagiaulax nanophus Holtzman 1978 multituberculate
Neoplagiaulax hunteri Simpson 1936 multituberculate
? Ectypodus sp. Matthew and Granger 1921 multituberculate
Parectypodus sp. Jepsen 1930 multituberculate
? Mesodma sp. Jepsen 1940 multituberculate
 Multituberculata - Ptilodontidae
Prochetodon foxi8 Krause 1987 multituberculate
Ptilodus wyomingensis Jepsen 1940 multituberculate
 Proteutheria - Palaeoryctidae
Palaeoryctes cf. punctatus Van Valen 1966 eutherian
 Cimolesta - Titanoideidae
Titanoides primaevus Gidley 1917 pantodont
 Cimolesta - Apatemyidae
Unuchinia dysmathes Holtzman 1978 eutherian
 Placentalia -
Condylarthra indet. Cope 1881 placental
form "2"
 Macroscelidea - Apheliscidae
Dorraletes diminutivus1 Dorr 1952 elephant shrew
 Macroscelidea -
Litocherus zygeus6 Gingerich 1983 elephant shrew
 Insectivora -
Insectivora indet. Bowdich 1821 insectivoran
form "2"
 Primates - Paromomyidae
Ignacius frugivorus Matthew and Granger 1921 primate
 Primates - Carpolestidae
Carpodaptes cf. hazelae5 Simpson 1936 primate
Carpodaptes cf. hobackensis5 Dorr 1952 primate
 Primates - Plesiadapidae
Plesiadapis cf. churchilli7 Gingerich 1975 primate
 Tribosphenida - Pantolestoidae
Propalaeosinopa albertensis Simpson 1927 placental
 Soricomorpha - Nyctitheriidae
Leptacodon ? tener Matthew and Granger 1921 placental
 Procreodi - Arctocyonidae
Thryptacodon australis Simpson 1935 condylarth
Arctocyon sp. Blainville 1841 condylarth
 Tribosphenida - Phenacodontidae
Ectocion collinus1 Russell 1929 condylarth
Phenacodus grangeri9 Simpson 1935 condylarth
 Carnivora - Miacidae
Miacidae indet. Cope 1880 carnivoran
Viverravinae indet. Matthew 1909 carnivoran
 Ferae - Viverravidae
Protictis paralus n. sp. Holtzman 1978 placental