Chadronia Pocket: Chadronian, Nebraska
collected by H. J. Cook, M. C. Cook
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Leptictis acutidens
(Douglass 1902)
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= informal Novacek leptictid acutidens
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Alroy 2002 | |||||||||
Actinopteri
- Amiiformes
- Amiidae
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Amia sp.
Linnaeus 1766
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Reptilia
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Peltosaurus sp.
Cope 1873
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Reptilia
- Anguidae
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Glyptosaurus sp.
Marsh 1871
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Reptilia
- Testudines
- Testudinidae
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Stylemys sp.
Leidy 1851
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Mammalia
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Peratherium fugax
(Cope 1873)
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corrected as Herpetotherium fugax | ||||||||||
(1 measurement) | ||||||||||
Mammalia
- Perissodactyla
- Hyracodontidae
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Hyracodon nebraskensis
(Leidy 1850)
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confirmed by Prothero 1996e; "H. priscidens" is omitted by this author, who treats the two species as a chronocline | ||||||||||
Mammalia
- Perissodactyla
- Rhinocerotidae
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Trigonias osborni
Lucas 1900
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Trigonias wellsi
Wood 1927
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Prothero 2005 | |||||||||
Subhyracodon sp.
Wood 1927
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Mammalia
- Perissodactyla
- Brontotheriidae
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Brontotheriidae indet.
(Marsh 1873)
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Mammalia
- Perissodactyla
- Equidae
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Mesohippus sp.
Marsh 1875
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= Equidae indet.
Gray 1821
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Alroy 2002 | |||||||||
Mammalia
- Entelodontidae
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Archaeotherium mortoni
Leidy 1850
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Mammalia
- Anthracotheriidae
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Aepinacodon americanus
(Leidy 1856)
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Heptacodon cf. occidentalis
(Osborn and Wortman 1894)
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recombined as Heptacodon occidentale | ||||||||||
Mammalia
- Protoceratidae
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Pseudoprotoceras longinaris n. sp.
Cook 1934
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Cook 1934 | |||||||||
"Lower Chadron... about 9 miles north of Crawford" (7 measurements) | ||||||||||
Mammalia
- Agriochoeridae
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Agriochoerus sp.
Leidy 1850
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Mammalia
- Hypertragulidae
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Hypertragulus crawfordensis n. sp.
Cook 1934
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Cook 1934 | |||||||||
"Lower Chadron formation, north of Crawford" (1 measurement) | ||||||||||
Hypertragulus chadronensis n. sp.
Cook 1934
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Cook 1934 | |||||||||
"nine miles north of Crawford... lower part of the Chadron formation" (1 measurement) | ||||||||||
Mammalia
- Hypisodontidae
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Hypisodus paululus n. sp.
Cook 1934
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Cook 1934 | |||||||||
"Lower Chadron formation, about nine miles north of Crawford": omitted by Ostrander (1 measurement) | ||||||||||
Hypisodus minimus
(Cope 1873)
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may include "H. paululus" type of Cook 1934 | ||||||||||
Mammalia
- Leptomerycidae
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Leptomeryx sp.
Leidy 1853
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Mammalia
- Leptochoeridae
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Leptochoeridae indet.
Marsh 1894
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Stibarus sp.
Cope 1873
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Mammalia
- Tayassuidae
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Perchoerus minor
Cook 1922
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= Tayassuidae indet.
Palmer 1897
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Alroy 2002 | |||||||||
may include type of Scott 1940 | ||||||||||
Mammalia
- Merycoidodontidae
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Merycoidodon sp.
Leidy 1848
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Mammalia
- Camelidae
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Poebrotherium cf. wilsoni
Leidy 1847
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Mammalia
- Creodonta
- Hyaenodontidae
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Hyaenodon crucians
Leidy 1853
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Mammalia
- Carnivora
- Nimravidae
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Hoplophoneus mentalis
Sinclair 1921
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synonym of Hoplophoneus primaevus | ||||||||||
Mammalia
- Carnivora
- Canidae
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Hesperocyon sp.
Scott 1890
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= Hesperocyon gregarius
Cope 1873
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Wang 1994 | |||||||||
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
- Soricidae
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Domnina gradata
Cope 1873
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Mammalia
- Geolabididae
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Centetodon chadronensis
Lillegraven et al. 1981
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Mammalia
- Pantolestidae
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Chadronia margaretae n. gen., n. sp.
Cook 1954
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Cook 1954 | |||||||||
(1 measurement) | ||||||||||
Mammalia
- Rodentia
- Pipestoneomyidae
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Pipestoneomys bisulcatus
Donohoe 1956
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Mammalia
- Rodentia
- Cylindrodontidae
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Pseudocylindrodon neglectus
Burke 1935
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Cylindrodon fontis
Douglass 1902
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= Cylindrodon sp.
Douglass 1902
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Alroy 2002 | |||||||||
see discussion of this species by Emry and Korth 1996a | ||||||||||
Mammalia
- Rodentia
- Ischyromyidae
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Ischyromys veterior
Matthew 1903
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Mammalia
- Rodentia
- Heliscomyidae
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Heliscomys vetus
Cope 1873
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Mammalia
- Rodentia
- Eomyidae
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Eomyidae indet.
Winge 1887
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Yoderimys burkei
Black 1965
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recombined as Zemiodontomys burkei | ||||||||||
Adjidaumo minimus
(Matthew 1903)
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Paradjidaumo trilophus
(Cope 1873)
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recombined as Adjidaumo trilophus | ||||||||||
Aulolithomys bounites
Black 1965
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Mammalia
- Lagomorpha
- Leporidae
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Palaeolagus temnodon
Douglass 1902
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Megalagus brachyodon
(Matthew 1903)
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see common names |
Geography
Country: | United States | State/province: | Nebraska | County: | Dawes |
Coordinates: | 42.8° North, 103.4° West (view map) | ||||
Paleocoordinates: | 44.2° North, 94.7° West | ||||
Basis of coordinate: | stated in text | ||||
Geographic resolution: | outcrop |
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: | Big Cottonwood Creek | ||
Local section: | PineR | Local bed: | 1 | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: member assignment based on LaGarry pers. commun. 19 May 2005 from "a section a few feet thick... well down in the local section of the Chadron" (Wood 1969) |
Lithology and environment
Primary lithology: | poorly lithified argillaceous siltstone |
Lithology description: "grey-green... clay-silt" that includes some solid blocks but is also screenable in part (Cook 1954) | |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | bulk,surface (in situ),sieve |
Collection size: | 3000 specimens |
Reason for describing collection: | general faunal/floral analysis |
Museum repositories: | AMNH,UCMP |
Collectors: | H. J. Cook, M. C. Cook |
Taxonomic list comments:rodents and lagomorphs described by Wood 1969 NOT the same as Chadron Anthill, which is in Sioux Co. "has Orellan species that have been mixed from overlying strata": Korth 1989a; this probably refers to the three records noted below NW 1/4 sec 36 T33N R52W, i.e., 7 - 8 mi N of Crawford includes "9 miles north of Crawford" collection of Cook 1934: Patton and Taylor 1934 "Palaeolagus haydeni" is argued to be reworked; probably includes "Protolagus cf. affinis" of Cook 1934 "Adjidaumo minutus" is a composite of more than one species probably including some Orellan material: Korth 1989a "Eumys cf. elegans" is argued to be reworked |
Metadata
Database number: | 16930 | ||
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: | 2011-09-10 22:07:27 |
Access level: | the public | Released: | 1993-02-18 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
2716. | G. E. Ostrander. 1985. Correlation of the early Oligocene (Chadronian) in northwestern Nebraska. Dakoterra 2(2):205-231 [J. Alroy/J. Alroy/P. Holroyd] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
1268 | H. J. Cook. 1934. New artiodactyls from the Oligocene and Lower Miocene of Nebraska. American Midland Naturalist 15(2):148-165 [J. Alroy/J. Alroy/J. Alroy] | |
1269 | H. J. Cook. 1954. A remarkable new mammal from the lower Chadron of Nebraska. American Midland Naturalist 52(2):388-391 [J. Alroy/J. Alroy/J. Alroy] | |
51726 | D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot] | |
6226 | X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy] |