Florissant mammal bed: Chadronian, Colorado
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
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? Copedelphys sp.
Korth 1994
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= Herpetotherium huntii
Cope 1873
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Prothero and Sanchez 2004 | ||||||
Mammalia
- Merycoidodontidae
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Merycoidodon sp.
Leidy 1848
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Mammalia
- Leptomerycidae
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? Leptomeryx sp.
Leidy 1853
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Mammalia
- Perissodactyla
- Rhinocerotidae
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Rhinocerotidae indet.
Gray 1821
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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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see common names |
Geography
Country: | United States | State/province: | Colorado | County: | Teller |
Coordinates: | 38.9° North, 105.3° West (view map) | ||||
Paleocoordinates: | 40.4° North, 97.0° West | ||||
Basis of coordinate: | based on political unit |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
*Period: | Tertiary | *Local age/stage: | Chadronian |
Key time interval: | Chadronian | ||
Age range of interval: | 37 - 33.9 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Florissant | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: said to be Chadronian there are four 40Ar/39Ar dates on sanidine from three levels higher in the section, with overlapping errors: the first one up is from the "top of the caprock conglomerate" and is 34.03 +/- 0.09 Ma, and the weighted mean average of all four is 34.07 +/- 0.10 Ma; the entire formation is of reversed polarity, and the dates match it with Chron C13r (Prothero and Sanchez 2004) "most of" the reported material comes from a single bed in the "lower mudstone unit" that is shown in a section diagram to be about 1 m thick and conglomeratic, and there is an unpublished micromammal fauna from somewhere in the same unit (Prothero and Sanchez 2004) |
Lithology and environment
Primary lithology: | conglomerate |
Environment: | fluvial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | biostratigraphic analysis |
Metadata
Database number: | 16968 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy |
Modifier: | J. Alroy | Research group: | vertebrate |
Created: | 1999-10-13 00:00:00 | Last modified: | 2007-01-22 17:44:53 |
Access level: | the public | Released: | 1999-10-13 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1469. | E. Evanoff and P. M. Detoledo. 1999. Fossil mammals and biting insects from the upper Eocene Florissant formation of Colorado. Journal of Vertebrate Paleontology 19(3):43A [J. Alroy/J. Alroy/J. Ju] |
Secondary references:
19711 | D. R. Prothero and F. Sanchez. 2004. Magnetic stratigraphy of the upper Eocene Florissant Formation, Teller County, Colorado. New Mexico Museum of Natural History and Science Bulletin 26:145-149 [J. Alroy/J. Alroy] |