Collins Ranch: Harrisonian, Nebraska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Lagomorpha
- Ochotonidae
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Gripholagomys lavocati
Green 1972
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Mammalia
- Rodentia
- Cricetidae
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Paciculus nebraskensis
Alker 1969
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Mammalia
- Rodentia
- Allomyidae
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Alwoodia sp.
Rensberger 1983
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Mammalia
- Rodentia
- Sciuridae
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Miospermophilus sp.
Black 1963
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Protospermophilus sp.
Gazin 1930
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Mammalia
- Rodentia
- Mylagaulidae
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Promylagaulus riggsi
McGrew 1941
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Mammalia
- Rodentia
- Heliscomyidae
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Heliscomys woodi
McGrew 1941
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recombined as Tylionomys woodi | |||||||
Mammalia
- Rodentia
- Heteromyidae
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Harrymys sp.
Munthe 1988
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Proheteromys sp.
Wood 1932
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Schizodontomys cf. harkseni
(Macdonald 1970)
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Mammalia
- Rodentia
- Castoridae
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? Palaeocastor sp.
Leidy 1869
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Mammalia
- Erinaceidae
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Parvericius sp.
Koerner 1940
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Mammalia
- Proscalopidae
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Proscalops secundus
Matthew 1909
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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: | Sheridan |
Coordinates: | 42.8° North, 102.2° West (view map) | ||||
Paleocoordinates: | 43.6° North, 97.1° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Altitude: | 3670 feet | ||||
Geographic resolution: | small collection |
Time
10 m.y. bin: | Cenozoic 4-5 |
Key time interval: | Harrisonian |
Age range of interval: | 23.10000 - 18.50000 m.y. ago |
Stratigraphy
Formation: | Lavaca Flats Beds | Member: | Lions Bridge Beds | ||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: "late late Arikareean" (= Harrisonian) |
Lithology and environment
Primary lithology: | planar lamination,fine conglomerate |
Lithology description: "1 m bed of fine, laminated, intraclast pebble-conglomerate" | |
Environment: | fluvial indet. |
Geology comments: "deposited under flashy high energy fluvial conditions" |
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: | 39 specimens |
Rock censused: | 45 kg |
Reason for describing collection: | biostratigraphic analysis |
Museum repositories: | UNSM |
Collection method comments: "less than about 45 kg of gravel concentrate produced a small, fairly diverse microfauna. Reptile remains were abundant, especially jaws with teeth, while no fish, amphibian, or bird elements were recovered. Small mammal taxa are represented by one jaw fragment with one tooth and 38 isolated cheek teeth." | |
Taxonomic list comments:fauna apart from mammals not discussed |
Metadata
Also known as: | UNSM Sh-114 | ||
Database number: | 69807 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy | Research group: | vertebrate |
Created: | 2007-03-07 21:27:11 | Last modified: | 2007-03-07 23:27:11 |
Access level: | the public | Released: | 2007-03-07 21:27:10 |
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] |