Rahn Farm: Early/Lower Chadronian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Rodentia
- Cylindrodontidae
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Pseudocylindrodon sp.
Burke 1935
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| said to be new | ||||||||||
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Mammalia
- Rodentia
- Ischyromyidae
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Ischyromys douglassi
Black 1968
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Mammalia
- Lagomorpha
- Leporidae
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Palaeolagus cf. temnodon
Douglass 1902
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Mammalia
- Oligoryctidae
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Oligoryctes cameronensis
Hough 1956
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Mammalia
- Micropternodontidae
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Micropternodus borealis
Matthew 1903
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Mammalia
- Soricidae
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Domnina cf. gradata
Cope 1873
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Mammalia
- Geolabididae
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Centetodon kuenzii
Lillegraven et al. 1981
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Mammalia
- Merycoidodontidae
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Merycoidodon sp.
Leidy 1848
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Limnenetes platyceps
Douglass 1902
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Mammalia
- Leptomerycidae
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"Leptomeryx" cf. yoderi
Schlaikjer 1935
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"Leptomeryx" aff. speciosus
Lambe 1908
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Mammalia
- Perissodactyla
- Equidae
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Mesohippus sp.
Marsh 1875
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Mammalia
- Perissodactyla
- Brontotheriidae
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Brontotheriidae indet.
(Marsh 1873)
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Mammalia
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Herpetotherium valens
(Lambe 1908)
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Copedelphys titanelix
(Matthew 1903)
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Gallatin |
| Coordinates: | 45.9° North, 111.6° West (view map) | ||||
| Paleocoordinates: | 47.7° North, 102.7° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | local area |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
| *Period: | Early/Lower Tertiary | *Epoch: | Late/Upper Eocene | *Local age/stage: | Early/Lower Chadronian |
| Key time interval: | Early/Lower Chadronian | ||
| Age range of interval: | 37.00000 - 33.90000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Climbing Arrow | Member: | middle | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: from the "middle white unit" | |||||
Lithology and environment
| Primary lithology: | siltstone |
| Lithology description: formation is "thick-bedded white to grayish-yellow tuffaceous siltstone" | |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USGS |
| Collection method comments: Rahn Farm and Eureka Valley Road are distinct localities, but collections are lumped by Tabrum et al. | |
Metadata
| Also known as: | Eureka Valley Road (USGS f158; MV 6403) | ||
| Database number: | 27245 | ||
| Authorizer: | J. Alroy | Enterer: | J. Alroy |
| Modifier: | J. Alroy | Research group: | vertebrate |
| Created: | 2002-11-24 10:54:50 | Last modified: | 2002-11-24 13:08:49 |
| Access level: | the public | Released: | 2002-11-24 10:54:50 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 4220. | A. R. Tabrum, R. Nichols, and A. D. Barnosky. 2001. Tertiary paleontology of southwest Montana and adjacent Idaho. Museum of the Rockies Occasional Paper 3:93-112 [J. Alroy/J. Alroy/J. Alroy] |