Belmont Grade: Harrisonian, Nebraska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Talpidae
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? Scalopoides sp.
Wilson 1960
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Mammalia
- Proscalopidae
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Proscalops secundus
Matthew 1909
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Mammalia
- Erinaceidae
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Parvericius sp.
Koerner 1940
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Mammalia
- Rodentia
- Sciuridae
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Tamias sp.
Illinger 1811
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= Tamiini indet.
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Alroy 2007 | ||||||
synonym of Marmotini | |||||||
Mammalia
- Rodentia
- Castoridae
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Palaeocastor sp.
Leidy 1869
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Mammalia
- Rodentia
- Heteromyidae
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cf. Mookomys sp.
Wood 1931
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Dikkomys matthewi
Wood 1936
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Proheteromys sp.
Wood 1932
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Mammalia
- Rodentia
- Cricetidae
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Leidymys sp.
Wood 1936
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Mammalia
- Rodentia
- Zapodidae
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Schaubeumys sp.
Wood 1935
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Mammalia
- Rodentia
- Mylagaulidae
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Promylagaulus riggsi
McGrew 1941
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Mammalia
- Rodentia
- Entoptychidae
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Entoptychus grandiplanus
Korth 1992
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Mammalia
- Rodentia
- Florentiamyidae
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Florentiamys sp.
Wood 1936
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Hitonkala sp.
Macdonald 1963
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Mammalia
- Lagomorpha
- Ochotonidae
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Gripholagomys lavocati
Green 1972
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Mammalia
- Lagomorpha
- Leporidae
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? Archaeolagus sp.
Dice 1917
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Mammalia
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Herpetotherium youngi
(McGrew 1937)
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see common names |
Geography
Country: | United States | State/province: | Nebraska | County: | Dawes |
Coordinates: | 42.6° North, 103.3° West (view map) | ||||
Paleocoordinates: | 43.4° North, 98.3° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Altitude: | 4730 feet | ||||
Geographic resolution: | small collection |
Time
Key time interval: | Harrisonian |
Age range of interval: | 24.80000 - 20.43000 m.y. ago |
Stratigraphy
Geological group: | Arikaree | Formation: | Coffee Mill Butte Beds | ||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: "late late Arikareean" (= Harrisonian) |
Lithology and environment
Primary lithology: | very fine,volcaniclastic,shelly/skeletal,brown sandstone |
Lithology description: "lens of fragmentary bone/tooth 'puddingstone'... absence of fluvial bedding... 10 m interval... is characterized by 1.8 m beds of brown, well sorted, very fine-grained, eolian volcaniclastic sandstone bounded by calcareous ledges... A single helical burrow (Daemonelix) [was] discovered near the base of this unit" | |
Environment: | eolian indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | mesofossils |
Articulated whole bodies: | none |
Associated major elements: | none |
Disassociated major elements: | some |
Disassociated minor elements: | many |
Collection methods and comments
Collection methods: | selective quarrying,field collection |
Collection size: | 218 specimens |
Reason for describing collection: | biostratigraphic analysis |
Museum repositories: | UNSM |
Collection method comments: "in situ concentration of vertebrate debris... Less than 2.3 kg of concentrate, composed of roughly 25 percent vertebrate tooth and bone fragments... microfauna. Reptile elements including dentaries were abundant, however, no fish, amphibian, or bird remains were recovered. Small mammals are represented by 11 jaw framgents with one or more teeth and 207 isolated cheek teeth." | |
Taxonomic list comments:fauna apart from mammals not discussed |
Metadata
Also known as: | UNSM Dw-123 | ||
Database number: | 69806 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy |
Modifier: | J. Alroy | Research group: | vertebrate |
Created: | 2007-03-07 21:18:18 | Last modified: | 2007-03-07 23:29:13 |
Access level: | the public | Released: | 2007-03-07 21:18:18 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
19303. | B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy] |
Secondary references:
19636 | J. Alroy. 2007. Synonymies and reidentifications of North American fossil vertebrates and so forth. [J. Alroy/J. Alroy] |