PBDB Collection

Crazy Johnson (Eocene of the United States)

Where: Pennington and Shannon County, South Dakota (43.6° N, 102.5° W: paleocoordinates 44.9° N, 93.6° W)

• coordinate based on political unit

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

Environment/lithology: terrestrial

Primary reference: J. Clark and J. R. Beerbower. 1967. Geology, paleoecology, and paleoclimatology of the Chadron Formation. Fieldiana 5(5):21-74 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 16938: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Tribosphenida - Pantolestoidae	Cymaprimadon kenni n. sp.² Cymaprimadon kenni n. sp.² Clark 1968 placental
Soricomorpha - Proscalopidae	"Arctoryctes galbreathi" = Oligoscalops galbreathi "Arctoryctes galbreathi" = Oligoscalops galbreathi Reed 1956 placental
Artiodactyla - Tayassuidae	Perchoerus minor⁷ Perchoerus minor⁷ Cook 1922 peccary FMNH PM20802
Artiodactyla - Anthracotheriidae	Heptacodon sp., Aepinacodon cf. americanus¹ Heptacodon sp. Marsh 1894 anthracothere Aepinacodon cf. americanus¹ Leidy 1856 anthracothere
Artiodactyla - Hypertragulidae	Hypertragulidae indet. Hypertragulidae indet. Cope 1879 ruminant
Artiodactyla - Agriochoeridae	Agriochoeridae indet., Agriochoerus cf. antiquus Agriochoeridae indet. Leidy 1869 agriochoerid Agriochoerus cf. antiquus Leidy 1850 agriochoerid
Artiodactyla - Protoceratidae	Pseudoprotoceras longinaris³ Pseudoprotoceras longinaris³ Cook 1934 protoceratid
Artiodactyla - Camelidae	Camelidae indet. Camelidae indet. Gray 1821 camel
Perissodactyla - Brontotheriidae	Brontotheriidae indet.⁶, "Megacerops sp." = Megacerops⁵, "Menops sp." = Megacerops⁵ Brontotheriidae indet.⁶ Marsh 1873 brontothere "Megacerops sp." = Megacerops⁵ Leidy 1870 brontothere "Menops sp." = Megacerops⁵ Leidy 1870 brontothere
Perissodactyla - Equidae	Mesohippus bairdi¹ Mesohippus bairdi¹ Leidy 1850 anchitheriine horse
Perissodactyla - Hyracodontidae	Hyracodon cf. priscidens Hyracodon cf. priscidens Lambe 1905 odd-toed ungulate
Perissodactyla - Rhinocerotidae	"Caenopus mitis" = Subhyracodon mitis, Trigonias osborni "Caenopus mitis" = Subhyracodon mitis Cope 1875 rhinoceros Trigonias osborni Lucas 1900 rhinoceros
Carnivora - Nimravidae	"Hoplophoneus mentalis" = Hoplophoneus primaevus¹, Eusmilus sp. "Hoplophoneus mentalis" = Hoplophoneus primaevus¹ Leidy and Owen 1851 false sabre-tooth Eusmilus sp. Gervais 1876 false sabre-tooth
Carnivora - Amphicyonidae	Daphoenus sp., "Daphoenocyon dodgei" = Brachyrhynchocyon dodgei Daphoenus sp. Leidy 1853 bear-dog confirmed by Hunt 1998b "Daphoenocyon dodgei" = Brachyrhynchocyon dodgei Scott 1898 bear-dog
Creodonta - Hyaenodontidae	Hyaenodon cf. horridus¹ Hyaenodon cf. horridus¹ Leidy 1853 creodont
Rodentia - Eomyidae	Eomyidae indet., Adjidaumo sp. Eomyidae indet. Winge 1887 rodent Adjidaumo sp. Hay 1899 rodent
Reptilia
Testudines - Kinosternoidea	Xenochelys formosa Xenochelys formosa Hay 1906 mud turtle described by Williams 1952
Testudines - Carettochelyidae	Anosteirinae indet.⁴ Anosteirinae indet.⁴ Lydekker 1889 turtle "Anosterine" marginal plates
Testudines - Emydidae	Trachemys antiqua Trachemys antiqua Clark 1937 slider
Testudines - Geoemydidae	"Graptemys cordifera" = Echmatemys lativertebralis "Graptemys cordifera" = Echmatemys lativertebralis Cope 1877 turtle
Crocodylia - Alligatoridae	Alligator cf. prenasalis Alligator cf. prenasalis Loomis 1904 alligator

¹Alroy 2002; ²Clark 1968; ³Emry and Storer 1981; ⁴Hutchison 1996; ⁵Mader 1989; ⁶Osborn 1929; ⁷Prothero 2009