Harris Ranch Unit E Silt ( of the United States)

Also known as Blue Ash Channel

Where: Fall River County, South Dakota (43.2° N, 103.2° W: paleocoordinates 44.1° N, 97.3° W)

• coordinate based on political unit

When: Arikareean (30.8 - 20.4 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: W. F. Simpson. 1985. Geology and paleontology of the Oligocene Harris Ranch Badlands, southwestern South Dakota. Dakoterra 2(2):303-333 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17520: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot and Nicholas Famoso

Creative Commons license: CC BY (attribution)

Taxonomic list

• channel cuts into Brule Fm.; siltstone overlies basal microconglomerate
no evidence of reworking
Mammalia
 Perissodactyla - Equidae
Miohippus cf. obliquidens1 Osborn 1904 anchitheriine horse
 Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821 rhinoceros
Woodoceras brachyops n. gen. n. sp.5 Prothero 2005 rhinoceros
Diceratherium annectens5 Marsh 1873 rhinoceros
"Early Arikareean, Harris Ranch, ?Sharps Formation, Fall River County, South Dakota"
Diceratherium armatum Marsh 1875 rhinoceros
 Artiodactyla - Merycoidodontidae
Leptauchenia major1 Leidy 1856 oreodont
? Merycoidodon sp. Leidy 1848 oreodont
large: probably OK
 Artiodactyla - Anthracotheriidae
Elomeryx cf. garbanii Macdonald 1970 anthracothere
 Artiodactyla - Entelodontidae
Entelodontidae indet. Lydekker 1883 even-toed ungulate
 Artiodactyla - Protoceratidae
Protoceras skinneri n. sp. Patton and Taylor 1973 protoceratid
from "4 feet above a blue ash": see Patton and Taylor 1973
 Artiodactyla - Agriochoeridae
Agriochoeridae indet. Leidy 1869 agriochoerid
 Theriamorpha - Erinaceidae
Ocajila macdonaldi4 Korth 2022 hedgehog
Blue Ash Local Fauna (Unit E of Simpson, 1985)
 Rodentia - Aplodontidae
Ansomys cyanotephrus n. sp.3 Korth 2007 mountain beaver
 Rodentia - Sciuridae
Hesperopetes jamesi n. sp.2 Emry and Korth 2007 squirrel
Hesperopetes blacki n. sp.2 Emry and Korth 2007 squirrel
 Rodentia - Castoridae
Castoridae indet. Gray 1821 beaver