Circle Locality (Paleocene of the United States)

Where: McCone County, Montana (47.8° N, 106.1° W: paleocoordinates 53.1° N, 84.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

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

Environment/lithology: terrestrial

Primary reference: D. L. Wolberg. 1979. Late Paleocene (Tiffanian) mammalian fauna of two localities in eastern Montana. Northwest Geology 8:83-93 [J. Alroy/J. Alroy]more details

PaleoDB collection 14937: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• Gunnell 1994 lists Ptilodus sp. "C"; not clear if this replaces P. montanus
Mammalia
 Cimolesta - Cimolestidae
Acmeodon sp. Matthew and Granger 1921 eutherian
 Cimolesta - Palaeoryctidae
Palaeoryctes sp. Matthew 1913 eutherian
 Cimolesta - Pantolestidae
Propalaeosinopa albertensis Simpson 1927 eutherian
Palaeosinopa sp. Matthew 1901 eutherian
 Cimolesta - Pentacodontidae
Bisonalveus sp. Gazin 1956 eutherian
 Primates - Microsyopidae
Microsyopidae indet. Osborn and Wortman 1892 primate
Navajovius sp. Matthew and Granger 1921 primate
confirmed by Gunnell 1989
 Primates - Plesiadapidae
Plesiadapis cf. rex Gidley 1923 primate
 Primates - Carpolestidae
Carpodaptes hazelae Simpson 1936 primate
 Primates - Paromomyidae
Phenacolemurinae indet. Simpson 1955 primate
Ignacius frugivorus Matthew and Granger 1921 primate
 Primates - Omomyidae
? Trogolemur sp. Matthew 1909 primate
biochronologically very implausible and genus not said by Archibald et al. 1987 to range into the Paleocene; but there is no description or discussion and no other published i.d.s of Trogolemur have been questioned in print
 Dermoptera -
Elpidophorus elegans Simpson 1927 colugo
 Tribosphenida - Plagiomenidae
Plagiomenidae indet. Matthew 1918 placental
 Tribosphenida - Phenacodontidae
Ectocion cf. collinus Russell 1929 condylarth
 Tribosphenida - Nyctitheriidae
Leptacodon cf. tener Matthew and Granger 1921 placental
 Macroscelidea -
Litocherus lacunatus Gazin 1956 elephant shrew
 Macroscelidea - Apheliscidae
Haplaletes cf. disceptatrix Simpson 1935 elephant shrew
Litomylus cf. ishami Gazin 1956 elephant shrew
 Tribosphenida - Arctocyonidae
Arctocyon cf. ferox Cope 1883 condylarth
Thryptacodon cf. australis Simpson 1935 condylarth
Colpoclaenus cf. procyonoides Matthew 1937 condylarth
Chriacus sp. Cope 1883 condylarth
 Multituberculata - Neoplagiaulacidae
Ectypodus sp., "Parectypodus cf. laytoni" = Ectypodus laytoni, Neoplagiaulax hunteri
Ectypodus sp. Matthew and Granger 1921 multituberculate
"Parectypodus cf. laytoni" = Ectypodus laytoni Jepsen 1940 multituberculate
Neoplagiaulax hunteri Simpson 1936 multituberculate
 Multituberculata - Ptilodontidae
Ptilodus montanus Douglass 1908 multituberculate