Crazy Johnson: Chadronian, South Dakota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
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Alligator cf. prenasalis
(Loomis 1904)
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Reptilia
- Testudines
- Kinosternoidea
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Xenochelys formosa
Hay 1906
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described by Williams 1952 | ||||||||||
Reptilia
- Testudines
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Dermatemydidae indet.
Baur 1888
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"Anosterine" marginal plates | ||||||||||
= Anosteirinae indet.
Lydekker 1889
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Hutchison 1996 | |||||||||
Reptilia
- Testudines
- Geoemydidae
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Graptemys cordifera
Clark 1937
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synonym of Echmatemys lativertebralis | ||||||||||
Reptilia
- Testudines
- Emydidae
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Trachemys antiqua
Clark 1937
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Mammalia
- Rodentia
- Eomyidae
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Eomyidae indet.
Winge 1887
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Adjidaumo sp.
Hay 1899
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Mammalia
- Pantolestidae
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Cymaprimadon kenni n. sp.
Clark 1968
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Clark 1968 | |||||||||
Mammalia
- Proscalopidae
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Arctoryctes galbreathi
Reed 1956
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recombined as Oligoscalops galbreathi | ||||||||||
Mammalia
- Carnivora
- Amphicyonidae
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Daphoenus sp.
Leidy 1853
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confirmed by Hunt 1998b | ||||||||||
Daphoenocyon dodgei
(Scott 1898)
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recombined as Brachyrhynchocyon dodgei | ||||||||||
Mammalia
- Carnivora
- Nimravidae
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Hoplophoneus oharrai
Jepsen 1926
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= Hoplophoneus mentalis
Sinclair 1921
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Alroy 2002 | |||||||||
synonym of Hoplophoneus primaevus | ||||||||||
this includes the type, see Bryant 1996 | ||||||||||
Eusmilus sp.
Gervais 1876
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Mammalia
- Creodonta
- Hyaenodontidae
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Hyaenodon cf. cruentus
Leidy 1853
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= Hyaenodon cf. horridus
Leidy 1853
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Alroy 2002 | |||||||||
Mammalia
- Agriochoeridae
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Agriochoeridae indet.
Leidy 1869
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Agriochoerus cf. antiquus
Leidy 1850
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Mammalia
- Hypertragulidae
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Hypertragulidae indet.
Cope 1879
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Mammalia
- Protoceratidae
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Poabromylus kayi
Peterson 1932
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(6 measurements) | ||||||||||
= Pseudoprotoceras longinaris
Cook 1934
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Emry and Storer 1981 | |||||||||
replaces ID of Wilson 1974; FMNH collection | ||||||||||
Mammalia
- Tayassuidae
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Perchoerus minor
Cook 1922
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Prothero 2009 | |||||||||
FMNH PM20802 | ||||||||||
Mammalia
- Anthracotheriidae
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Bothriodon americanus
(Leidy 1856)
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= Aepinacodon cf. americanus
Leidy 1856
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Alroy 2002 | |||||||||
mentioned by Macdonald 1956b as "A. sp." | ||||||||||
Heptacodon sp.
Marsh 1894
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Mammalia
- Camelidae
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Camelidae indet.
Gray 1821
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Mammalia
- Perissodactyla
- Equidae
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Mesohippus latidens
Douglass 1903
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(1 measurement) | ||||||||||
= Mesohippus bairdi
Leidy 1850
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Alroy 2002 | |||||||||
and "M. hypostylus" | ||||||||||
Mammalia
- Perissodactyla
- Rhinocerotidae
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Trigonias osborni
Lucas 1900
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Caenopus mitis
(Cope 1875)
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recombined as Subhyracodon mitis | ||||||||||
Mammalia
- Perissodactyla
- Hyracodontidae
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Hyracodon cf. priscidens
Lambe 1905
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Mammalia
- Perissodactyla
- Brontotheriidae
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Brontotherium hypoceras
(Cope 1874)
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= Brontotheriidae indet.
Marsh 1873
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Osborn 1929 | |||||||||
referred: middle beds, "level probably correct" | ||||||||||
Menodus giganteus
(Pomel 1849)
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= Megacerops sp.
Leidy 1870
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Mader 1989 | |||||||||
in part | ||||||||||
Menodus giganteus
(Pomel 1849)
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= Menops sp.
Marsh 1887
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Mader 1989 | |||||||||
synonym of Megacerops | ||||||||||
in part; may include type of "Allops crassicornis" of Osborn 1902, from "middle beds" or possibly "upper beds" and of uncertain geographic provenance: Osborn 1929 | ||||||||||
see common names |
Geography
Country: | United States | State/province: | South Dakota | County: | Pennington and Shannon |
Coordinates: | 43.6° North, 102.5° West (view map) | ||||
Paleocoordinates: | 44.9° North, 93.6° West | ||||
Basis of coordinate: | based on political unit |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
*Period: | Tertiary | ||
Key time interval: | Chadronian | ||
Age range of interval: | 37.00000 - 33.90000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Chadron | Member: | Crazy Johnson |
Local section: | BgBad | Local bed: | 2 |
Local order: | bottom to top |
Lithology and environment
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Collection methods and comments
Reason for describing collection: | paleoecologic analysis |
Metadata
Database number: | 16938 | ||
Authorizer: | J. Alroy, J. Marcot | Enterer: | J. Alroy, J. Marcot |
Modifier: | J. Alroy | Research group: | vertebrate |
Created: | 1993-02-18 00:00:00 | Last modified: | 2006-09-13 00:29:51 |
Access level: | the public | Released: | 1993-02-18 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1235. | ETE 10023 | 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] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
1234 | J. Clark. 1968. Cymaprimadontidae A New Family of Insectivores. Fieldiana 16(8) [J. Alroy/J. Alroy/J. Ju] | |
1454 | R. J. Emry and J. E. Storer. 1981. The Hornless Protoceratid Pseudoprotoceras (Tylopoda: Artiodactyla) in the Early Oligocene of Saskatchewan and Wyoming. Journal of Vertebrate Paleontology 1(1):101-110 [J. Alroy/J. Alroy/M. Uhen] | |
34290 | J. H. Hutchison. 1996. Testudines. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 337-353 [J. Alroy/J. Alroy] | |
2395 | B. J. Mader. 1989. The Brontotheriidae: A Systematic Revision and Preliminary Phylogeny of North American Genera. In D. R. Prothero and R. M. Schoch (eds.), The Evolution of Perissodactyls [J. Alroy/J. Alroy/M. Uhen] | |
2708 | H. F. Osborn. 1929. New Eurasiatic and American proboscideans. American Museum Novitates 393:1-22 [J. Alroy/J. Alroy/M. Carrano] | |
57282 | D. R. Prothero. 2009. The Early Evolution of the North American Peccaries (Artiodactyla: Tayassuidae). Papers on Geology, Vertebrate Paleontology, and Biostratigraphy in Honor of Michael O. Woodburne (Museum of Northern Arizona Bulletin 65) 509-541 [J. Marcot/J. Marcot] | |
2847 | C. A. Reed and W. D. Turnbull. 1965. The Mammalian Genera Arctoryctes and Cryptoryctes From the Oligocene and Miocene of North America. Fieldiana 15(2) [J. Alroy/J. Alroy/J. Ju] |