PBDB Collection

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

Show authors, comments, and common names

Reptilia
Testudines - Kinosternoidea	Xenochelys formosa⁴ Xenochelys formosa⁴ Hay 1906 mud turtle SDSM specimen from "Yoder Formation, Goshen County"
Mammalia
Didelphimorphia - Didelphidae	Didelphinae indet. Didelphinae indet. Gray 1827 opossum
Perissodactyla - Hyracodontidae	"Hyracodon ischyrolophus n. sp." = Hyracodon petersoni "Hyracodon ischyrolophus n. sp." = Hyracodon petersoni Wood 1926 odd-toed ungulate = Hyracodon petersoni based on Prothero 1996e H. priscidens is not present; total
Perissodactyla -	Toxotherium hunteri Toxotherium hunteri Wood 1961 odd-toed ungulate
Perissodactyla - Rhinocerotidae	Penetrigonias sp.³, "Trigonias yoderensis n. sp." = Caenopus yoderensis Penetrigonias sp.³ Tanner and Martin 1976 rhinoceros one of the SDSM specimens of T. yoderensis "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
Perissodactyla - Brontotheriidae	Megacerops osborni n. sp., "Menops sp." = Megacerops¹ Megacerops osborni n. sp. Schlaikjer 1935 brontothere "Menops sp." = Megacerops¹ Leidy 1870 brontothere
Perissodactyla - Equidae	Mesohippus cf. bairdi¹ Mesohippus cf. bairdi¹ Leidy 1850 anchitheriine horse
Artiodactyla - Entelodontidae	cf. Archaeotherium sp. cf. Archaeotherium sp. Leidy 1850 even-toed ungulate
Artiodactyla - Anthracotheriidae	Heptacodon sp. Heptacodon sp. Marsh 1894 anthracothere described by Macdonald 1956b
Artiodactyla - Protoceratidae	Pseudoprotoceras longinaris, Pseudoprotoceras minor n. sp. Pseudoprotoceras longinaris Cook 1934 protoceratid includes "Poabromylus kayi" of Wilson 1974 Pseudoprotoceras minor n. sp. Wilson 1974 protoceratid see Wilson 1974
Artiodactyla - Leptomerycidae	Leptomeryx yoderi n. sp. Leptomeryx yoderi n. sp. Schlaikjer 1935 ruminant some of this may be L. speciosus: Heaton and Emry 1996
Artiodactyla - Leptochoeridae	Stibarus yoderensis Stibarus yoderensis Macdonald 1955 even-toed ungulate
Artiodactyla - Merycoidodontidae	Bathygenys alpha, Merycoidodon sp. Bathygenys alpha Douglass 1902 oreodont described also by Wilson 1971a Merycoidodon sp. Leidy 1848 oreodont
Creodonta - Hyaenodontidae	Hyaenodon venturae⁵, Hyaenodon horridus Hyaenodon venturae⁵ Mellett 1977 creodont new USNM specimen Hyaenodon horridus Leidy 1853 creodont
Creodonta - Hyainailouridae	"Hemipsalodon cooki n. sp." = Hemipsalodon grandis "Hemipsalodon cooki n. sp." = Hemipsalodon grandis Cope 1885 creodont
Carnivora - Amphicyonidae	"Daphoenocyon dodgei" = Brachyrhynchocyon dodgei "Daphoenocyon dodgei" = Brachyrhynchocyon dodgei Scott 1898 bear-dog includes type of "Miacis matthewi"
Carnivora - Ursidae	Parictis parvus² Parictis parvus² Clark and Beerbower 1967 bear
Theriamorpha - Epoicotheriidae	Epoicotherium unicum Epoicotherium unicum Douglass 1905 placental includes type of "Pseudochrysochloris yoderensis"
Theriamorpha - Geolabididae	Centetodon cf. magnus Centetodon cf. magnus Clark 1936 placental
Rodentia - Eomyidae	Yoderimys bumpi, Adjidaumo cf. minimus, "Paradjidaumo trilophus" = Adjidaumo trilophus¹ Yoderimys bumpi Wood 1955 rodent Adjidaumo cf. minimus Matthew 1903 rodent "Paradjidaumo trilophus" = Adjidaumo trilophus¹ Cope 1873 rodent
Rodentia - Aplodontidae	Aplodontidae indet.¹ Aplodontidae indet.¹ Brandt 1855 mountain beaver
Chiroptera -	Microchiroptera indet. Microchiroptera indet. Dobson 1875 bat a bat

¹Alroy 2002; ²Bryant 1993; ³Hanson 1989; ⁴Hutchison 1991; ⁵Lavrov and Emry 1998