Niobrara River (coll. Hayden 1857): Barstovian - Clarendonian, Nebraska
collected by F. V. Hayden group 1857

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Testudines - Testudinidae
Testudo (Stylemys) niobrarensis n. sp. Leidy 1858
nomen dubium belonging to Stylemys
Mammalia - Proboscidea - Elephantidae
Elephas (Euelephas) imperator n. sp. Leidy 1858
synonym of Mammuthus columbi
Mammalia - Proboscidea - Gomphotheriidae
Mastodon (Tetralophodon) mirificus n. sp. Leidy 1858
recombined as Stegomastodon mirificus
Mammalia - Carnivora - Canidae
Aelurodon ferox n. gen., n. sp. Leidy 1858
Canis temerarius n. sp. Leidy 1858
recombined as Paratomarctus temerarius
Canis saevus n. sp. Leidy 1858
recombined as Epicyon saevus
Canis (Epicyon) haydeni n. sp. Leidy 1858
recombined as Epicyon haydeni
Canis vafer n. sp. Leidy 1858
recombined as Leptocyon vafer
Mammalia - Carnivora - Felidae
Felis (Pseudaelurus) intrepidus n. sp. Leidy 1858
recombined as Pseudaelurus intrepidus
Mammalia - Perissodactyla - Equidae
Anchitherium (Hypohippus) affinis n. sp. Leidy 1858
recombined as Hypohippus affinis
Anchitherium (Parahippus) cognatus n. sp. Leidy 1858
recombined as Parahippus cognatus
Merychippus insignis Leidy 1856
Hippotherium occidentale (Leidy 1856)
recombined as Cormohipparion occidentale
Hippotherium speciosum (Leidy 1854)
synonym of Neohipparion affine
Equus (Protohippus) perditus n. sp. Leidy 1858
recombined as Protohippus perditus
Equus excelsus n. sp. Leidy 1858
Merychippus mirabilis Leidy 1858
recombined as Pliohippus mirabilis
Mammalia - Perissodactyla - Rhinocerotidae
Rhinoceros crassus n. sp. Leidy 1858
nomen dubium belonging to Rhinocerotidae
Mammalia - Merycoidodontidae
Merycochoerus proprius n. gen., n. sp. Leidy 1858
Merychyus elegans n. gen., n. sp. Leidy 1858
Merychyus medius n. sp. Leidy 1858
recombined as Ustatochoerus medius
Merychyus major n. sp. Leidy 1858
recombined as Ustatochoerus major
Mammalia - Camelidae
Procamelus occidentalis n. gen., n. sp. Leidy 1858
Megalomeryx niobrarensis n. gen., n. sp. Leidy 1858
Mammalia - Antilocapridae
Merycodus necatus n. sp. Leidy 1854
Cervus warreni n. sp. Leidy 1858
recombined as Merycodus warreni
Mammalia - Rodentia - Castoridae
Castor (Eucastor) tortus n. sp. Leidy 1858
recombined as Eucastor tortus
Hystrix (Hystricops) venustus n. sp. Leidy 1858
recombined as Hystricops venustus
see common names

Geography
Country:United States State/province:Nebraska County:Sheridan
Coordinates: 42.7° North, 102.5° West (view map)
Paleocoordinates:43.2° North, 99.7° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Neogene Epoch:Miocene
Key time interval:Barstovian - Clarendonian
Age range of interval:16.30000 - 9.40000 m.y. ago
Stratigraphy
Formation:Loup Fork
Stratigraphic resolution:formation
Stratigraphy comments: Wang et al. (1999) considers the Niobrara River localities to be Barstovian - Clarendonian in age
entered as "Loop Fork"
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collectors:F. V. Hayden group Collection dates:1857
Metadata
Database number:190543
Authorizer:E. Vlachos Enterer:E. Vlachos
Modifier:B. Allen Research group:vertebrate
Created:2017-12-11 08:41:06 Last modified:2023-07-29 08:09:28
Access level:the public Released:2017-12-11 08:41:06
Creative Commons license:CC BY
Reference information

Primary reference:
59118. J. Leidy. 1858. Notice of Remains of Extinct Vertebrata, from the Valley of the Niobrara River, Collected during the Exploring Expedition of 1857, in Nebraska, under the Command of Lieut. G. K. Warren, U. S. Top. Eng., by Dr. F. V. Hayden, Geologist to the Expedition. Proceedings of the Academy of Natural Sciences of Philadelphia 10:15-89 [J. Marcot/J. Marcot]