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
| Reptilia | |
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Alligator cf. prenasalis Loomis 1904 alligator | |
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"Graptemys cordifera" = Echmatemys lativertebralis
"Graptemys cordifera" = Echmatemys lativertebralis Cope 1877 turtle | |
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Trachemys antiqua Clark 1937 slider | |
| Mammalia | |
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Eomyidae indet. Winge 1887 rodent
Adjidaumo sp. Hay 1899 rodent | |
Cymaprimadon kenni n. sp.2
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"Arctoryctes galbreathi" = Oligoscalops galbreathi
"Arctoryctes galbreathi" = Oligoscalops galbreathi Reed 1956 placental | |
Daphoenus sp., "Daphoenocyon dodgei" = Brachyrhynchocyon dodgei
"Daphoenocyon dodgei" = Brachyrhynchocyon dodgei Scott 1898 bear-dog | |
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Eusmilus sp. Gervais 1876 false sabre-tooth | |
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Agriochoeridae indet. Leidy 1869 agriochoerid
Agriochoerus cf. antiquus Leidy 1850 agriochoerid | |
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Hypertragulidae indet. Cope 1879 ruminant | |
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Heptacodon sp. Marsh 1894 anthracothere | |
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Camelidae indet. Gray 1821 camel | |
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Trigonias osborni, "Caenopus mitis" = Subhyracodon mitis
Trigonias osborni Lucas 1900 rhinoceros
"Caenopus mitis" = Subhyracodon mitis Cope 1875 rhinoceros | |
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Hyracodon cf. priscidens Lambe 1905 odd-toed ungulate | |
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