Yoder: Chadronian, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Testudines
- Kinosternoidea
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Xenochelys formosa
Hay 1906
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Hutchison 1991 | |||||||||
SDSM specimen from "Yoder Formation, Goshen County" | ||||||||||
Mammalia
- Chiroptera
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Microchiroptera indet.
Dobson 1875
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a bat | ||||||||||
Mammalia
- Epoicotheriidae
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Epoicotherium unicum
(Douglass 1905)
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4 specimens | |||||||||
includes type of "Pseudochrysochloris yoderensis" | ||||||||||
Mammalia
- Creodonta
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Hemipsalodon cooki n. sp.
Schlaikjer 1935
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3 specimens | |||||||||
synonym of Hemipsalodon grandis | ||||||||||
Mammalia
- Creodonta
- Hyaenodontidae
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Hyaenodon venturae
Mellett 1977
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Lavrov and Emry 1998 | |||||||||
new USNM specimen | ||||||||||
Hyaenodon horridus
Leidy 1853
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1 specimen | |||||||||
Mammalia
- Carnivora
- Ursidae
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Daphoenus sp.
Leidy 1853
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3 specimens | |||||||||
= Parictis parvus
Clark and Beerbower 1967
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Bryant 1993 | |||||||||
Mammalia
- Carnivora
- Amphicyonidae
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Daphoenocyon dodgei
(Scott 1898)
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6 specimens | |||||||||
recombined as Brachyrhynchocyon dodgei | ||||||||||
includes type of "Miacis matthewi" (6 measurements) | ||||||||||
Mammalia
- Perissodactyla
- Equidae
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Mesohippus cf. celer
(Marsh 1874)
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7 specimens | |||||||||
= Mesohippus cf. bairdi
Leidy 1850
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Alroy 2002 | |||||||||
Mammalia
- Perissodactyla
- Brontotheriidae
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Megacerops osborni n. sp.
(Schlaikjer 1935)
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5 specimens | |||||||||
Menodus sp.
(Pomel 1848)
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7 specimens | |||||||||
= Menops sp.
Marsh 1887
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Alroy 2002 | |||||||||
synonym of Megacerops | ||||||||||
based on diagnosis of Gregory in Scott 1941, which in turn depends on Osborn 1929, which equates with Menops sensu Mader 1998; Schlaikjer's "Brontops ? brachycephalus"; | ||||||||||
Mammalia
- Perissodactyla
- Rhinocerotidae
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Penetrigonias sp.
Tanner and Martin 1976
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Hanson 1989 | |||||||||
one of the SDSM specimens of T. yoderensis | ||||||||||
Trigonias yoderensis n. sp.
(Schlaikjer 1935)
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8 specimens | |||||||||
synonym of Subhyracodon | ||||||||||
may include "Subhyracodon woodi" type, which is an indeterminate specimen of Trigonias sp.; including "T. sp." specimens (6 measurements) | ||||||||||
Mammalia
- Perissodactyla
- Hyracodontidae
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Hyracodon ischyrolophus n. sp.
Schlaikjer 1935
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4 specimens | |||||||||
synonym of Hyracodon petersoni | ||||||||||
= Hyracodon petersoni based on Prothero 1996e H. priscidens is not present; total | ||||||||||
Mammalia
- Perissodactyla
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Toxotherium hunteri
Wood 1961
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1 specimen | |||||||||
Mammalia
- Anthracotheriidae
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Heptacodon sp.
Marsh 1894
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3 specimens | |||||||||
described by Macdonald 1956b | ||||||||||
Mammalia
- Entelodontidae
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cf. Archaeotherium sp.
Leidy 1850
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2 specimens | |||||||||
Mammalia
- Leptochoeridae
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Stibarus yoderensis
Macdonald 1955
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3 specimens | |||||||||
(4 measurements) | ||||||||||
Mammalia
- Merycoidodontidae
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Merycoidodon sp.
Leidy 1848
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5 specimens | |||||||||
Bathygenys alpha
Douglass 1902
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4 specimens | |||||||||
described also by Wilson 1971a (6 measurements) | ||||||||||
Mammalia
- Protoceratidae
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Pseudoprotoceras longinaris
Cook 1934
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8 specimens | |||||||||
includes "Poabromylus kayi" of Wilson 1974 (7 measurements) | ||||||||||
Pseudoprotoceras minor n. sp.
(Wilson 1974)
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5 specimens | |||||||||
see Wilson 1974 (6 measurements) | ||||||||||
Mammalia
- Leptomerycidae
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Leptomeryx yoderi n. sp.
Schlaikjer 1935
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50 specimens | |||||||||
some of this may be L. speciosus: Heaton and Emry 1996 (6 measurements) | ||||||||||
Mammalia
- Geolabididae
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Centetodon cf. magnus
(Clark 1936)
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1 specimen | |||||||||
Mammalia
- Rodentia
- Aplodontidae
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Prosciurus sp.
(Matthew 1903)
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= Aplodontidae indet.
Brandt 1855
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Alroy 2002 | |||||||||
Mammalia
- Rodentia
- Eomyidae
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Yoderimys bumpi
Wood 1955
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14 specimens | |||||||||
Paradjidaumo minor
(Douglass 1902)
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7 specimens | |||||||||
= Paradjidaumo trilophus
Cope 1873
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Alroy 2002 | |||||||||
recombined as Adjidaumo trilophus | ||||||||||
Adjidaumo cf. minimus
(Matthew 1903)
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6 specimens | |||||||||
Mammalia
- Didelphimorphia
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Didelphinae indet.
Gray 1827
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see common names |
Geography
Country: | United States | State/province: | Wyoming | County: | Goshen |
Coordinates: | 42.0° North, 104.2° West (view map) | ||||
Paleocoordinates: | 43.4° North, 95.5° West | ||||
Basis of coordinate: | based on political unit | ||||
Geographic resolution: | local area |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
*Period: | Tertiary | *Epoch: | Late/Upper Eocene | *Local age/stage: | Chadronian |
Key time interval: | Chadronian | ||
Age range of interval: | 37.00000 - 33.90000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Lithology and environment
Primary lithology: | ferruginous,red sandy siltstone |
Secondary lithology: | "cross stratification",green sandstone |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: "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." | |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Associated major elements: | some |
Disassociated major elements: | some |
Disassociated minor elements: | many |
Collection methods and comments
Collection methods: | survey of museum collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | SDSM |
Taxonomic list comments:originally described by Schlaikjer 1935a NISP 157 |
Metadata
Also known as: | SDSMT V-5310; Yoder Quarry #1 | ||
Database number: | 17045 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy |
Modifier: | E. Leckey | Research group: | vertebrate |
Created: | 1993-02-18 00:00:00 | Last modified: | 2003-07-14 13:46:57 |
Access level: | the public | Released: | 1993-02-18 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
2079. | 5% 17180 | 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] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
1142 | H. N. Bryant. 1993. Carnivora and Creodonta of the Calf Creek Local Fauna (Late Eocene, Chadronian), Cypress Hills Formation, Saskatchewan. Journal of Paleontology 67(6):1032-1046 [J. Alroy/J. Alroy/J. Marcot] | |
1781 | C. B. Hanson. 1989. Teletaceras Radinskyi, A New Primitive Rhinocerotid from the Late Eocene Clarno Formation, Oregon. In D. R. Prothero and R. M. Schoch (eds.), The Evolution of Perissodactyls [J. Alroy/J. Alroy/M. Uhen] | |
691 | J. H. Hutchison. 1991. Early Kinosterninae (Reptilia: Testudines) and their phylogenetic significance. Journal of Vertebrate Paleontology 11(2):145-167 [J. Alroy/J. Alroy/J. Alroy] | |
2211 | A. V. Lavrov and R. J. Emry. 1998. Hyaenodon venturae (Hyaenodontidae, Creodonta, Mammalia) from the early Chadronian (latest Eocene) of Wyoming. Journal of Paleontology 72(4):752-757 [J. Alroy/J. Alroy/J. Alroy] |