Yoder (Eocene of the United States)

Also known as SDSMT V-5310; Yoder Quarry #1

Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 43.4° N, 95.5° W)

• coordinate based on political unit

• local area-level geographic resolution

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

• member-level stratigraphic resolution

Environment/lithology: terrestrial; ferruginous, red, sandy siltstone and green sandstone

• "16.2 meters of variegated red, green and burgundy claystone, sandstone and conglomerate... The most common lithology is brick red, fine sandy, silstone.... Most of the small to medium sized species... come from this facies... Typically the sandstones are purple or green... They are arkoskic and exhibit low to high angle crossbedding. Most of the large species have been found in this facies."

Size class: macrofossils

Reposited in the SDSM

Primary reference: A. J. Kihm. 1987. Mammalian paleontology and geology of the Yoder Member, Chadron Formation, east-central Wyoming. Dakoterra 3:28-45 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 17045: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• originally described by Schlaikjer 1935a

•NISP 157

Reptilia
 Testudines - Kinosternoidea
Xenochelys formosa4 Hay 1906 mud turtle
SDSM specimen from "Yoder Formation, Goshen County"
Mammalia
 Rodentia - Aplodontidae
Aplodontidae indet.1 Brandt 1855 mountain beaver
 Rodentia - Eomyidae
Paradjidaumo trilophus1 Cope 1873 rodent
Yoderimys bumpi Wood 1955 rodent
Adjidaumo cf. minimus Matthew 1903 rodent
 Lipotyphla - Geolabididae
Centetodon cf. magnus Clark 1936 placental
 Perissodactyla - Brontotheriidae
"Menops sp." = Megacerops1, Megacerops osborni n. sp.
"Menops sp." = Megacerops1 Leidy 1870 brontothere
Megacerops osborni n. sp. Schlaikjer 1935 brontothere
 Perissodactyla - Hyracodontidae
Hyracodon petersoni1 Wood 1926 odd-toed ungulate
 Perissodactyla - Rhinocerotidae
"Trigonias yoderensis n. sp." = Caenopus yoderensis, Penetrigonias sp.3
"Trigonias yoderensis n. sp." = Caenopus yoderensis Schlaikjer 1935 rhinoceros
may include "Subhyracodon woodi" type, which is an indeterminate specimen of Trigonias sp.; including "T. sp." specimens
Penetrigonias sp.3 Tanner and Martin 1976 rhinoceros
one of the SDSM specimens of T. yoderensis
 Perissodactyla -
Toxotherium hunteri Wood 1961 odd-toed ungulate
 Perissodactyla - Equidae
Mesohippus cf. bairdi1 Leidy 1850 anchitheriine horse
 Carnivora - Ursidae
Parictis parvus2 Clark and Beerbower 1967 bear
 Carnivora - Amphicyonidae
Brachyrhynchocyon dodgei1 Scott 1898 bear-dog
 Ferae - Epoicotheriidae
Epoicotherium unicum Douglass 1905 placental
includes type of "Pseudochrysochloris yoderensis"
 Chiroptera -
Microchiroptera indet. Dobson 1875 bat
a bat
 Ungulata - Merycoidodontidae
Bathygenys alpha Douglass 1902 oreodont
described also by Wilson 1971a
Merycoidodon sp. Leidy 1848 oreodont
 Ungulata - Leptochoeridae
Stibarus yoderensis Macdonald 1955 even-toed ungulate
 Ungulata - Entelodontidae
cf. Archaeotherium sp. Leidy 1850 even-toed ungulate
 Ungulata - Anthracotheriidae
Heptacodon sp. Marsh 1894 anthracothere
described by Macdonald 1956b
 Ungulata - Protoceratidae
Pseudoprotoceras longinaris Cook 1934 protoceratid
includes "Poabromylus kayi" of Wilson 1974
Pseudoprotoceras minor n. sp. Wilson 1974 protoceratid
see Wilson 1974
 Ungulata - Leptomerycidae
Leptomeryx yoderi n. sp. Schlaikjer 1935 ruminant
some of this may be L. speciosus: Heaton and Emry 1996
 Hyaenodonta - Hyainailouridae
Hemipsalodon grandis1 Cope 1885 eutherian
 Hyaenodonta - Hyaenodontidae
Hyaenodon venturae5 Mellett 1977 eutherian
new USNM specimen
Hyaenodon horridus Leidy 1853 eutherian
 Didelphimorphia - Didelphidae
Didelphinae indet. Gray 1827 opossum