Dirty Creek Flats (Eocene of the United States)

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.8° N, 95.1° W)

• coordinate based on political unit

When: Peanut Peak Member (Chadron Formation), Chadronian (37.2 - 33.9 Ma)

• member assignment based on LaGarry pers. commun. 19 May 2005

Environment/lithology: terrestrial

Primary reference: G. E. Ostrander. 1985. Correlation of the early Oligocene (Chadronian) in northwestern Nebraska. Dakoterra 2(2):205-231 [J. Alroy/J. Alroy/P. Holroyd]more details

PaleoDB collection 16940: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• NE 1/4 sec 26 T33N R53W
Mammalia
 Carnivora - Amphicyonidae
Daphoenictis sp. Hunt 1974 bear-dog
 Carnivora - Canidae
Hesperocyon sp. Scott 1890 canid
 Perissodactyla - Equidae
Equidae indet. Gray 1821 horse
 Perissodactyla - Hyracodontidae
Hyracodon nebraskensis Leidy 1850 odd-toed ungulate
probably OK because Ostrander also recognizes H. priscidens
 Perissodactyla - Brontotheriidae
Brontotheriidae indet. Marsh 1873 brontothere
 Artiodactyla - Camelidae
Poebrotherium sp. Leidy 1847 camel
 Artiodactyla - Merycoidodontidae
Merycoidodon sp. Leidy 1848 oreodont
 Artiodactyla - Entelodontidae
Archaeotherium sp. Leidy 1850 even-toed ungulate
 Artiodactyla - Tayassuidae
Tayassuidae indet. Palmer 1897 peccary
 Artiodactyla - Protoceratidae
Pseudoprotoceras longinaris Cook 1934 protoceratid
 Artiodactyla - Hypisodontidae
Hypisodus minimus Cope 1873 ruminant
 Artiodactyla - Leptomerycidae
Leptomeryx sp. Leidy 1853 ruminant
 Theriamorpha - Micropternodontidae
Micropternodus borealis Matthew 1903 placental
 Rodentia - Aplodontidae
Prosciurus vetustus Matthew 1903 mountain beaver
 Rodentia - Sciuridae
Sciuridae indet. Gray 1821 squirrel
 Rodentia - Ischyromyidae
? Leptotomus sp. Matthew 1910 rodent
Ischyromys veterior Matthew 1903 rodent
 Rodentia - Eomyidae
Adjidaumo minutus Cope 1873 rodent
 Rodentia - Cylindrodontidae
Pseudocylindrodon neglectus Burke 1935 rodent
 Lagomorpha - Leporidae
Megalagus brachyodon Matthew 1903 rabbit
Palaeolagus temnodon Douglass 1902 rabbit