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Chadron - Yoder, Goshen County, Wyoming, USA

Formation	Chadron
Member	Yoder
Age:	37.2 - 33.9 Ma Paleogene
Interval	Chadronian
Lithology	siltstone/sandstone
Number of Collections	1
Number of Occurrences	29

Recorded Sample Locations

Location	Region	Stratigraphic Name
Apternodus gregoryi Locality	Goshen County, Wyoming, USA	Chadron - Yoder

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Brule	33.3 - 30.8 Ma Oligocene	sandstone	162
Brule - lower	33.9 - 33.3 Ma Oligocene		38
Brule - Poleslide	33.3 - 30.8 Ma Oligocene	sandstone	126
Brule - upper	30.8 - 20.4 Ma Cenozoic		5
Chadron	37.2 - 33.9 Ma Paleogene	claystone, "siliciclastic", "limestone", "volcaniclastic"	132
Harrison	24.8 - 20.4 Ma Cenozoic	sandstone	160
White River	30.8 - 20.4 Ma Cenozoic	mudstone, siltstone, sandstone	329
Arikaree - Harrison - Lower	24.8 - 20.4 Ma Cenozoic		47
Hemingford - Marsland	24.8 - 20.4 Ma Cenozoic	sandstone	107

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Heptacodon sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Anthracotheriidae : *Heptacodon*	37.2 - 33.9 Ma Paleogene
Archaeotherium sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Entelodontidae : *Archaeotherium*	37.2 - 33.9 Ma Paleogene
? no name ?	100		37.2 - 33.9 Ma Paleogene
Leptomeryx yoderi species	7	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae : Leptomeryx : *Leptomeryx yoderi*	37.2 - 33.9 Ma Paleogene
Bathygenys alpha species	7	Animalia : Chordata : Mammalia : Artiodactyla : Merycoidodontidae : Bathygenys : *Bathygenys alpha*	37.2 - 33.9 Ma Paleogene
Merycoidodon sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Merycoidodontidae : *Merycoidodon*	37.2 - 33.9 Ma Paleogene
Pseudoprotoceras longinaris species	7	Animalia : Chordata : Mammalia : Artiodactyla : Protoceratidae : Pseudoprotoceras : *Pseudoprotoceras longinaris*	37.2 - 33.9 Ma Paleogene
Poabromylus minor species	7	Animalia : Chordata : Mammalia : Artiodactyla : Protoceratidae : Pseudoprotoceras : *Poabromylus minor*	37.2 - 33.9 Ma Paleogene
Brachyrhynchocyon dodgei species	7	Animalia : Chordata : Mammalia : Carnivora : Amphicyonidae : Brachyrhynchocyon : *Brachyrhynchocyon dodgei*	37.2 - 33.9 Ma Paleogene
Parictis parvus species	7	Animalia : Chordata : Mammalia : Carnivora : Phocidae : Parictis : *Parictis parvus*	37.2 - 33.9 Ma Paleogene
Microchiroptera suborder	4.3	Animalia : Chordata : Mammalia : Chiroptera : Microchiroptera	37.2 - 33.9 Ma Paleogene
Didelphinae subfamily	5.3	Animalia : Chordata : Mammalia : Didelphimorphia : Didelphidae : Didelphinae	37.2 - 33.9 Ma Paleogene
Hyaenodon horridus species	7	Animalia : Chordata : Mammalia : Hyaenodontidae : Hyaenodon : *Hyaenodon horridus*	37.2 - 33.9 Ma Paleogene
Hyaenodon venturae species	7	Animalia : Chordata : Mammalia : Hyaenodonta : Hyaenodontidae : Hyaenodon : *Hyaenodon venturae*	37.2 - 33.9 Ma Paleogene
Hemipsalodon grandis species	7	Animalia : Chordata : Mammalia : Hyaenodonta : Hyainailouridae : Hemipsalodon : *Hemipsalodon grandis*	37.2 - 33.9 Ma Paleogene
Centetodon magnus species	7	Animalia : Chordata : Mammalia : Lipotyphla : Geolabididae : Centetodon : *Centetodon magnus*	37.2 - 33.9 Ma Paleogene
Epoicotherium unicum species	7	Animalia : Chordata : Mammalia : Epoicotheriidae : Epoicotherium : *Epoicotherium unicum*	37.2 - 33.9 Ma Paleogene
Megacerops sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Brontotheriidae : *Megacerops*	37.2 - 33.9 Ma Paleogene
Ateleodon osborni species	7	Animalia : Chordata : Mammalia : Perissodactyla : Brontotheriidae : Megacerops : *Ateleodon osborni*	37.2 - 33.9 Ma Paleogene
Mesohippus bairdi species	7	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : Mesohippus : *Mesohippus bairdi*	37.2 - 33.9 Ma Paleogene
Hyracodon petersoni species	7	Animalia : Chordata : Mammalia : Perissodactyla : Hyracodontidae : Hyracodon : *Hyracodon petersoni*	37.2 - 33.9 Ma Paleogene
Toxotherium hunteri species	7	Animalia : Chordata : Mammalia : Perissodactyla : Toxotherium : *Toxotherium hunteri*	37.2 - 33.9 Ma Paleogene
Penetrigonias sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Rhinocerotidae : *Penetrigonias*	37.2 - 33.9 Ma Paleogene
Subhyracodon sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Rhinocerotidae : *Subhyracodon*	37.2 - 33.9 Ma Paleogene
Aplodontidae family	5	Animalia : Chordata : Mammalia : Rodentia : Aplodontidae	37.2 - 33.9 Ma Paleogene
Adjidaumo minimus species	7	Animalia : Chordata : Mammalia : Rodentia : Eomyidae : Adjidaumo : *Adjidaumo minimus*	37.2 - 33.9 Ma Paleogene
Paradjidaumo trilophus species	7	Animalia : Chordata : Mammalia : Rodentia : Eomyidae : Paradjidaumo : *Paradjidaumo trilophus*	37.2 - 33.9 Ma Paleogene
Yoderimys bumpi species	7	Animalia : Chordata : Mammalia : Rodentia : Eomyidae : Yoderimys : *Yoderimys bumpi*	37.2 - 33.9 Ma Paleogene
Xenochelys formosa species	7	Animalia : Chordata : Reptilia : Testudines : Kinosternidae : Xenochelys : *Xenochelys formosa*	37.2 - 33.9 Ma Paleogene

References

Kihm A. J. (1987) Mammalian paleontology and geology of the Yoder Member, Chadron Formation, east-central Wyoming, Dakoterra 3, 28-45

Hanson C. B. (1989) Teletaceras Radinskyi, A New Primitive Rhinocerotid from the Late Eocene Clarno Formation, Oregon, The Evolution of Perissodactyls

Hutchison J. H. (1991) Early Kinosterninae (Reptilia: Testudines) and their phylogenetic significance, Journal of Vertebrate Paleontology 11 2, 145-167

Bryant H. N. (1993) Carnivora and Creodonta of the Calf Creek Local Fauna (Late Eocene, Chadronian), Cypress Hills Formation, Saskatchewan, Journal of Paleontology 67 6, 1032-1046

Lavrov A. V., Emry R. J. (1998) Hyaenodon venturae (Hyaenodontidae, Creodonta, Mammalia) from the early Chadronian (latest Eocene) of Wyoming, Journal of Paleontology 72 4, 752-757

Alroy J. (2002) Synonymies and reidentifications of North American fossil mammals

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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