PBDB Collection

Yoder: Chadronian, Wyoming

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Chiroptera

	Microchiroptera indet. Dobson 1875
	a bat
Mammalia - Perissodactyla - Hyracodontidae

	Hyracodon ischyrolophus n. sp. Schlaikjer 1935		4 specimens
	synonym of Hyracodon petersoni
	= Hyracodon petersoni based on Prothero 1996e H. priscidens is not present; total
Mammalia - Perissodactyla - Rhinocerotidae

	Trigonias yoderensis n. sp. (Schlaikjer 1935)		8 specimens
	synonym of Subhyracodon
	may include "Subhyracodon woodi" type, which is an indeterminate specimen of Trigonias sp.; including "T. sp." specimens (6 measurements)

	Penetrigonias sp. Tanner and Martin 1976	Hanson 1989
	one of the SDSM specimens of T. yoderensis
Mammalia - Perissodactyla

	Toxotherium hunteri Wood 1961		1 specimen
Mammalia - Perissodactyla - Brontotheriidae

	Menodus sp. (Pomel 1848)		7 specimens
	= Menops sp. Marsh 1887	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";

	Megacerops osborni n. sp. (Schlaikjer 1935)		5 specimens
Mammalia - Perissodactyla - Equidae

	Mesohippus cf. celer (Marsh 1874)		7 specimens
	= Mesohippus cf. bairdi Leidy 1850	Alroy 2002
Mammalia - Leptomerycidae

	Leptomeryx yoderi n. sp. Schlaikjer 1935		50 specimens
	some of this may be L. speciosus: Heaton and Emry 1996 (6 measurements)
Mammalia - Protoceratidae

	Pseudoprotoceras minor n. sp. (Wilson 1974)		5 specimens
	see Wilson 1974 (6 measurements)

	Pseudoprotoceras longinaris Cook 1934		8 specimens
	includes "Poabromylus kayi" of Wilson 1974 (7 measurements)
Mammalia - Merycoidodontidae

	Bathygenys alpha Douglass 1902		4 specimens
	described also by Wilson 1971a (6 measurements)

	Merycoidodon sp. Leidy 1848		5 specimens
Mammalia - Leptochoeridae

	Stibarus yoderensis Macdonald 1955		3 specimens
	(4 measurements)
Mammalia - Entelodontidae

	cf. Archaeotherium sp. Leidy 1850		2 specimens
Mammalia - Anthracotheriidae

	Heptacodon sp. Marsh 1894		3 specimens
	described by Macdonald 1956b
Mammalia - Carnivora - Ursidae

	Daphoenus sp. Leidy 1853		3 specimens
	= Parictis parvus Clark and Beerbower 1967	Bryant 1993
Mammalia - Carnivora - Amphicyonidae

	Daphoenocyon dodgei (Scott 1898)		6 specimens
	recombined as Brachyrhynchocyon dodgei
	includes type of "Miacis matthewi" (6 measurements)
Mammalia - Creodonta - Hyaenodontidae

	Hyaenodon horridus Leidy 1853		1 specimen

	Hyaenodon venturae Mellett 1977	Lavrov and Emry 1998
	new USNM specimen
Mammalia - Creodonta

	Hemipsalodon cooki n. sp. Schlaikjer 1935		3 specimens
	synonym of Hemipsalodon grandis
Mammalia - Epoicotheriidae

	Epoicotherium unicum (Douglass 1905)		4 specimens
	includes type of "Pseudochrysochloris yoderensis"
Mammalia - Geolabididae

	Centetodon cf. magnus (Clark 1936)		1 specimen
Mammalia - Rodentia - Eomyidae

	Adjidaumo cf. minimus (Matthew 1903)		6 specimens

	Paradjidaumo minor (Douglass 1902)		7 specimens
	= Paradjidaumo trilophus Cope 1873	Alroy 2002
	recombined as Adjidaumo trilophus

	Yoderimys bumpi Wood 1955		14 specimens
Mammalia - Rodentia - Aplodontidae

	Prosciurus sp. (Matthew 1903)
	= Aplodontidae indet. Brandt 1855	Alroy 2002
Mammalia - Didelphimorphia

	Didelphinae indet. Gray 1827
Reptilia - Testudines - Kinosternoidea

	Xenochelys formosa Hay 1906	Hutchison 1991
	SDSM specimen from "Yoder Formation, Goshen County"
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

Formation:	Chadron	Member:	Yoder
Local section:	Goshn	Local bed:	1
Local order:	bottom to top
Stratigraphic resolution:	member

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]