Upper Frontier Formation - Fremont County: Late/Upper Cretaceous, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Phyllites grandifolius-cretaceous leaf
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Phyllites cretaceous leaf
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Phyllites crassipes leaf
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Cycadopsida
- Cycadales
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Nilsonia mehli leaf
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Pinopsida
- Pinales
- Taxaceae
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Protophyllocladus subintegrifolius leaf
(Lesquereux 1868)
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Coniferales
- Cupressaceae
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Sequoia reichenbachi leaf
(Heer 1868)
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| recombined as Geinitzia reichenbachi | |||||||
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Angiospermae
- Fagales
- Nothofagaceae
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Dryophyllum lanceolatum leaf
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Angiospermae
- Malvales
- Malvaceae
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Sterculia towneri leaf
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Angiospermae
- Moraceae
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Ficus inaequalis leaf
Lesquereux 1891
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Wyoming | County: | Fremont |
| Coordinates: | 42.8° North, 108.7° West (view map) | ||||
| Paleocoordinates: | 48.5° North, 74.2° West | ||||
| Basis of coordinate: | based on nearby landmark |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| 10 m.y. bin: | Cretaceous 5-8 | ||
| *Period: | Cretaceous - Cretaceous | *Epoch: | Late/Upper Cretaceous - Late/Upper Cretaceous |
| Key time interval: | Late/Upper Cretaceous | ||
| Age range of interval: | 100.50000 - 66.00000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Frontier |
| Stratigraphic resolution: | formation |
Lithology and environment
| Lithology description: "the Frontier Fromation in Fremont county varies in its lithology from a coarse friable massive grayish sandstone to a finer more or less brownish or yellowish sandstone with a considerable intermixture of mudstone." | |
| Environment: | deltaic indet. |
Taphonomy
| Modes of preservation: | mold/impression,adpression,original carbon |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
| Collection method comments: For further modifications, see Crabtree, D.R. 1987. Angiosperms of the Northern Rocky Mountains: Albian to Campanian (Cretaceous) Megafossil floras. Ann. Missouri Bot. Gard. 74: 707-747. | |
Metadata
| Database number: | 31383 | ||
| Authorizer: | B. Tiffney | Enterer: | J. Fosdick |
| Modifier: | B. Tiffney | Research group: | paleobotany |
| Created: | 2003-05-11 14:36:20 | Last modified: | 2006-09-16 19:45:28 |
| Access level: | database members | Released: | 2003-05-11 14:36:20 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8477. | E.W. Berry. 1929. The flora of the Frontier Formation. United States Geological Survey Professional Paper 158:129-135 [B. Tiffney/J. Fosdick/J. Fosdick] |